RxSwift/RxTests/RxSwiftTests/Tests/Observable+MultipleTest+CombineLatest.swift

// This file is autogenerated.
// Take a look at `Preprocessor` target in RxSwift project 
//
//  Observable+MultipleTest+CombineLatest.tt
//  RxSwift
//
//  Created by Krunoslav Zaher on 4/25/15.
//  Copyright (c) 2015 Krunoslav Zaher. All rights reserved.
//

import Foundation
import XCTest
import RxSwift

// combine latest
extension ObservableMultipleTest {


    // 2

    func testCombineLatest_Never2() {
        let scheduler = TestScheduler(initialClock: 0)


        let e0 = scheduler.createHotObservable([
            next(150, 1)
        ])

        let e1 = scheduler.createHotObservable([
            next(150, 1)
        ])


        let res = scheduler.start { () -> Observable<Int> in
            let result: Observable<Int> = combineLatest(e0, e1) { (_, _) -> Int in
                return (42)
            }

            return result
        }
        
        XCTAssertEqual(res.messages, [])
        
        let subscriptions = [Subscription(200, 1000)]
        

        XCTAssertEqual(e0.subscriptions, subscriptions)
        XCTAssertEqual(e1.subscriptions, subscriptions)
    }

    func testCombineLatest_Empty2() {
        let scheduler = TestScheduler(initialClock: 0)


        let e0 = scheduler.createHotObservable([
            next(150, 1),
            completed(210)
        ])

        let e1 = scheduler.createHotObservable([
            next(150, 1),
            completed(220)
        ])


        let res = scheduler.start { () -> Observable<Int> in
            let result: Observable<Int> = combineLatest(e0, e1) { (_, _) -> Int in
                return (42)
            }

            return result
        }

        XCTAssertEqual(res.messages, [completed(220)])


        XCTAssertEqual(e0.subscriptions, [Subscription(200, 210)])

        XCTAssertEqual(e1.subscriptions, [Subscription(200, 220)])

    }

    func testCombineLatest_SelectorThrows2() {
        let scheduler = TestScheduler(initialClock: 0)


        let e0 = scheduler.createHotObservable([
            next(150, 1),
            next(210, 1),
            completed(400)
        ])

        let e1 = scheduler.createHotObservable([
            next(150, 1),
            next(220, 2),
            completed(400)
        ])


        let res = scheduler.start { () -> Observable<Int> in
            let result: Observable<Int> = combineLatest(e0, e1) { (_, _) throws -> Int in
                throw testError
            }

            return result
        }
        
        XCTAssertEqual(res.messages, [
            error(220, testError)
        ])


        XCTAssertEqual(e0.subscriptions, [Subscription(200, 220)])

        XCTAssertEqual(e1.subscriptions, [Subscription(200, 220)])

    }

    func testCombineLatest_WillNeverBeAbleToCombine2() {
        let scheduler = TestScheduler(initialClock: 0)
        

        let e0 = scheduler.createHotObservable([
            next(150, 1),
            completed(250)
        ])

        let e1 = scheduler.createHotObservable([
            next(150, 1),
            next(500, 2),
            completed(800)
        ])

        let res = scheduler.start { () -> Observable<Int> in
            let result: Observable<Int> = combineLatest(e0, e1) { (_, _) -> Int in
                return (42)
            }

            return result
        }

        XCTAssertEqual(res.messages, [
            completed(500)
        ])


        XCTAssertEqual(e0.subscriptions, [Subscription(200, 250)])

        XCTAssertEqual(e1.subscriptions, [Subscription(200, 500)])
    }
    
    func testCombineLatest_Typical2() {
        let scheduler = TestScheduler(initialClock: 0)


        let e0 = scheduler.createHotObservable([
            next(150, 1),
            next(210, 1),
            next(410, 3),
            completed(800)
        ])

        let e1 = scheduler.createHotObservable([
            next(150, 1),
            next(220, 2),
            next(420, 4),
            completed(800)
        ])

        let res = scheduler.start { () -> Observable<Int> in
            let result: Observable<Int> = combineLatest(e0, e1) {
                return ($0 + $1)
            }

            return result
        }

        XCTAssertEqual(res.messages, [
            
            next(220, 3),

            next(410, 5),
            next(420, 7),
            completed(800)
            ])


        XCTAssertEqual(e0.subscriptions, [Subscription(200, 800)])

        XCTAssertEqual(e1.subscriptions, [Subscription(200, 800)])

    }




    // 3

    func testCombineLatest_Never3() {
        let scheduler = TestScheduler(initialClock: 0)


        let e0 = scheduler.createHotObservable([
            next(150, 1)
        ])

        let e1 = scheduler.createHotObservable([
            next(150, 1)
        ])

        let e2 = scheduler.createHotObservable([
            next(150, 1)
        ])


        let res = scheduler.start { () -> Observable<Int> in
            let result: Observable<Int> = combineLatest(e0, e1, e2) { (_, _, _) -> Int in
                return (42)
            }

            return result
        }
        
        XCTAssertEqual(res.messages, [])
        
        let subscriptions = [Subscription(200, 1000)]
        

        XCTAssertEqual(e0.subscriptions, subscriptions)
        XCTAssertEqual(e1.subscriptions, subscriptions)
        XCTAssertEqual(e2.subscriptions, subscriptions)
    }

    func testCombineLatest_Empty3() {
        let scheduler = TestScheduler(initialClock: 0)


        let e0 = scheduler.createHotObservable([
            next(150, 1),
            completed(210)
        ])

        let e1 = scheduler.createHotObservable([
            next(150, 1),
            completed(220)
        ])

        let e2 = scheduler.createHotObservable([
            next(150, 1),
            completed(230)
        ])


        let res = scheduler.start { () -> Observable<Int> in
            let result: Observable<Int> = combineLatest(e0, e1, e2) { (_, _, _) -> Int in
                return (42)
            }

            return result
        }

        XCTAssertEqual(res.messages, [completed(230)])


        XCTAssertEqual(e0.subscriptions, [Subscription(200, 210)])

        XCTAssertEqual(e1.subscriptions, [Subscription(200, 220)])

        XCTAssertEqual(e2.subscriptions, [Subscription(200, 230)])

    }

    func testCombineLatest_SelectorThrows3() {
        let scheduler = TestScheduler(initialClock: 0)


        let e0 = scheduler.createHotObservable([
            next(150, 1),
            next(210, 1),
            completed(400)
        ])

        let e1 = scheduler.createHotObservable([
            next(150, 1),
            next(220, 2),
            completed(400)
        ])

        let e2 = scheduler.createHotObservable([
            next(150, 1),
            next(230, 3),
            completed(400)
        ])


        let res = scheduler.start { () -> Observable<Int> in
            let result: Observable<Int> = combineLatest(e0, e1, e2) { (_, _, _) throws -> Int in
                throw testError
            }

            return result
        }
        
        XCTAssertEqual(res.messages, [
            error(230, testError)
        ])


        XCTAssertEqual(e0.subscriptions, [Subscription(200, 230)])

        XCTAssertEqual(e1.subscriptions, [Subscription(200, 230)])

        XCTAssertEqual(e2.subscriptions, [Subscription(200, 230)])

    }

    func testCombineLatest_WillNeverBeAbleToCombine3() {
        let scheduler = TestScheduler(initialClock: 0)
        

        let e0 = scheduler.createHotObservable([
            next(150, 1),
            completed(250)
        ])

        let e1 = scheduler.createHotObservable([
            next(150, 1),
            completed(260)
        ])

        let e2 = scheduler.createHotObservable([
            next(150, 1),
            next(500, 2),
            completed(800)
        ])

        let res = scheduler.start { () -> Observable<Int> in
            let result: Observable<Int> = combineLatest(e0, e1, e2) { (_, _, _) -> Int in
                return (42)
            }

            return result
        }

        XCTAssertEqual(res.messages, [
            completed(500)
        ])


        XCTAssertEqual(e0.subscriptions, [Subscription(200, 250)])

        XCTAssertEqual(e1.subscriptions, [Subscription(200, 260)])

        XCTAssertEqual(e2.subscriptions, [Subscription(200, 500)])
    }
    
    func testCombineLatest_Typical3() {
        let scheduler = TestScheduler(initialClock: 0)


        let e0 = scheduler.createHotObservable([
            next(150, 1),
            next(210, 1),
            next(410, 4),
            completed(800)
        ])

        let e1 = scheduler.createHotObservable([
            next(150, 1),
            next(220, 2),
            next(420, 5),
            completed(800)
        ])

        let e2 = scheduler.createHotObservable([
            next(150, 1),
            next(230, 3),
            next(430, 6),
            completed(800)
        ])

        let res = scheduler.start { () -> Observable<Int> in
            let result: Observable<Int> = combineLatest(e0, e1, e2) {
                return ($0 + $1 + $2)
            }

            return result
        }

        XCTAssertEqual(res.messages, [
            
            next(230, 6),

            next(410, 9),
            next(420, 12),
            next(430, 15),
            completed(800)
            ])


        XCTAssertEqual(e0.subscriptions, [Subscription(200, 800)])

        XCTAssertEqual(e1.subscriptions, [Subscription(200, 800)])

        XCTAssertEqual(e2.subscriptions, [Subscription(200, 800)])

    }




    // 4

    func testCombineLatest_Never4() {
        let scheduler = TestScheduler(initialClock: 0)


        let e0 = scheduler.createHotObservable([
            next(150, 1)
        ])

        let e1 = scheduler.createHotObservable([
            next(150, 1)
        ])

        let e2 = scheduler.createHotObservable([
            next(150, 1)
        ])

        let e3 = scheduler.createHotObservable([
            next(150, 1)
        ])


        let res = scheduler.start { () -> Observable<Int> in
            let result: Observable<Int> = combineLatest(e0, e1, e2, e3) { (_, _, _, _) -> Int in
                return (42)
            }

            return result
        }
        
        XCTAssertEqual(res.messages, [])
        
        let subscriptions = [Subscription(200, 1000)]
        

        XCTAssertEqual(e0.subscriptions, subscriptions)
        XCTAssertEqual(e1.subscriptions, subscriptions)
        XCTAssertEqual(e2.subscriptions, subscriptions)
        XCTAssertEqual(e3.subscriptions, subscriptions)
    }

    func testCombineLatest_Empty4() {
        let scheduler = TestScheduler(initialClock: 0)


        let e0 = scheduler.createHotObservable([
            next(150, 1),
            completed(210)
        ])

        let e1 = scheduler.createHotObservable([
            next(150, 1),
            completed(220)
        ])

        let e2 = scheduler.createHotObservable([
            next(150, 1),
            completed(230)
        ])

        let e3 = scheduler.createHotObservable([
            next(150, 1),
            completed(240)
        ])


        let res = scheduler.start { () -> Observable<Int> in
            let result: Observable<Int> = combineLatest(e0, e1, e2, e3) { (_, _, _, _) -> Int in
                return (42)
            }

            return result
        }

        XCTAssertEqual(res.messages, [completed(240)])


        XCTAssertEqual(e0.subscriptions, [Subscription(200, 210)])

        XCTAssertEqual(e1.subscriptions, [Subscription(200, 220)])

        XCTAssertEqual(e2.subscriptions, [Subscription(200, 230)])

        XCTAssertEqual(e3.subscriptions, [Subscription(200, 240)])

    }

    func testCombineLatest_SelectorThrows4() {
        let scheduler = TestScheduler(initialClock: 0)


        let e0 = scheduler.createHotObservable([
            next(150, 1),
            next(210, 1),
            completed(400)
        ])

        let e1 = scheduler.createHotObservable([
            next(150, 1),
            next(220, 2),
            completed(400)
        ])

        let e2 = scheduler.createHotObservable([
            next(150, 1),
            next(230, 3),
            completed(400)
        ])

        let e3 = scheduler.createHotObservable([
            next(150, 1),
            next(240, 4),
            completed(400)
        ])


        let res = scheduler.start { () -> Observable<Int> in
            let result: Observable<Int> = combineLatest(e0, e1, e2, e3) { (_, _, _, _) throws -> Int in
                throw testError
            }

            return result
        }
        
        XCTAssertEqual(res.messages, [
            error(240, testError)
        ])


        XCTAssertEqual(e0.subscriptions, [Subscription(200, 240)])

        XCTAssertEqual(e1.subscriptions, [Subscription(200, 240)])

        XCTAssertEqual(e2.subscriptions, [Subscription(200, 240)])

        XCTAssertEqual(e3.subscriptions, [Subscription(200, 240)])

    }

    func testCombineLatest_WillNeverBeAbleToCombine4() {
        let scheduler = TestScheduler(initialClock: 0)
        

        let e0 = scheduler.createHotObservable([
            next(150, 1),
            completed(250)
        ])

        let e1 = scheduler.createHotObservable([
            next(150, 1),
            completed(260)
        ])

        let e2 = scheduler.createHotObservable([
            next(150, 1),
            completed(270)
        ])

        let e3 = scheduler.createHotObservable([
            next(150, 1),
            next(500, 2),
            completed(800)
        ])

        let res = scheduler.start { () -> Observable<Int> in
            let result: Observable<Int> = combineLatest(e0, e1, e2, e3) { (_, _, _, _) -> Int in
                return (42)
            }

            return result
        }

        XCTAssertEqual(res.messages, [
            completed(500)
        ])


        XCTAssertEqual(e0.subscriptions, [Subscription(200, 250)])

        XCTAssertEqual(e1.subscriptions, [Subscription(200, 260)])

        XCTAssertEqual(e2.subscriptions, [Subscription(200, 270)])

        XCTAssertEqual(e3.subscriptions, [Subscription(200, 500)])
    }
    
    func testCombineLatest_Typical4() {
        let scheduler = TestScheduler(initialClock: 0)


        let e0 = scheduler.createHotObservable([
            next(150, 1),
            next(210, 1),
            next(410, 5),
            completed(800)
        ])

        let e1 = scheduler.createHotObservable([
            next(150, 1),
            next(220, 2),
            next(420, 6),
            completed(800)
        ])

        let e2 = scheduler.createHotObservable([
            next(150, 1),
            next(230, 3),
            next(430, 7),
            completed(800)
        ])

        let e3 = scheduler.createHotObservable([
            next(150, 1),
            next(240, 4),
            next(440, 8),
            completed(800)
        ])

        let res = scheduler.start { () -> Observable<Int> in
            let result: Observable<Int> = combineLatest(e0, e1, e2, e3) {
                return ($0 + $1 + $2 + $3)
            }

            return result
        }

        XCTAssertEqual(res.messages, [
            
            next(240, 10),

            next(410, 14),
            next(420, 18),
            next(430, 22),
            next(440, 26),
            completed(800)
            ])


        XCTAssertEqual(e0.subscriptions, [Subscription(200, 800)])

        XCTAssertEqual(e1.subscriptions, [Subscription(200, 800)])

        XCTAssertEqual(e2.subscriptions, [Subscription(200, 800)])

        XCTAssertEqual(e3.subscriptions, [Subscription(200, 800)])

    }




    // 5

    func testCombineLatest_Never5() {
        let scheduler = TestScheduler(initialClock: 0)


        let e0 = scheduler.createHotObservable([
            next(150, 1)
        ])

        let e1 = scheduler.createHotObservable([
            next(150, 1)
        ])

        let e2 = scheduler.createHotObservable([
            next(150, 1)
        ])

        let e3 = scheduler.createHotObservable([
            next(150, 1)
        ])

        let e4 = scheduler.createHotObservable([
            next(150, 1)
        ])


        let res = scheduler.start { () -> Observable<Int> in
            let result: Observable<Int> = combineLatest(e0, e1, e2, e3, e4) { (_, _, _, _, _) -> Int in
                return (42)
            }

            return result
        }
        
        XCTAssertEqual(res.messages, [])
        
        let subscriptions = [Subscription(200, 1000)]
        

        XCTAssertEqual(e0.subscriptions, subscriptions)
        XCTAssertEqual(e1.subscriptions, subscriptions)
        XCTAssertEqual(e2.subscriptions, subscriptions)
        XCTAssertEqual(e3.subscriptions, subscriptions)
        XCTAssertEqual(e4.subscriptions, subscriptions)
    }

    func testCombineLatest_Empty5() {
        let scheduler = TestScheduler(initialClock: 0)


        let e0 = scheduler.createHotObservable([
            next(150, 1),
            completed(210)
        ])

        let e1 = scheduler.createHotObservable([
            next(150, 1),
            completed(220)
        ])

        let e2 = scheduler.createHotObservable([
            next(150, 1),
            completed(230)
        ])

        let e3 = scheduler.createHotObservable([
            next(150, 1),
            completed(240)
        ])

        let e4 = scheduler.createHotObservable([
            next(150, 1),
            completed(250)
        ])


        let res = scheduler.start { () -> Observable<Int> in
            let result: Observable<Int> = combineLatest(e0, e1, e2, e3, e4) { (_, _, _, _, _) -> Int in
                return (42)
            }

            return result
        }

        XCTAssertEqual(res.messages, [completed(250)])


        XCTAssertEqual(e0.subscriptions, [Subscription(200, 210)])

        XCTAssertEqual(e1.subscriptions, [Subscription(200, 220)])

        XCTAssertEqual(e2.subscriptions, [Subscription(200, 230)])

        XCTAssertEqual(e3.subscriptions, [Subscription(200, 240)])

        XCTAssertEqual(e4.subscriptions, [Subscription(200, 250)])

    }

    func testCombineLatest_SelectorThrows5() {
        let scheduler = TestScheduler(initialClock: 0)


        let e0 = scheduler.createHotObservable([
            next(150, 1),
            next(210, 1),
            completed(400)
        ])

        let e1 = scheduler.createHotObservable([
            next(150, 1),
            next(220, 2),
            completed(400)
        ])

        let e2 = scheduler.createHotObservable([
            next(150, 1),
            next(230, 3),
            completed(400)
        ])

        let e3 = scheduler.createHotObservable([
            next(150, 1),
            next(240, 4),
            completed(400)
        ])

        let e4 = scheduler.createHotObservable([
            next(150, 1),
            next(250, 5),
            completed(400)
        ])


        let res = scheduler.start { () -> Observable<Int> in
            let result: Observable<Int> = combineLatest(e0, e1, e2, e3, e4) { (_, _, _, _, _) throws -> Int in
                throw testError
            }

            return result
        }
        
        XCTAssertEqual(res.messages, [
            error(250, testError)
        ])


        XCTAssertEqual(e0.subscriptions, [Subscription(200, 250)])

        XCTAssertEqual(e1.subscriptions, [Subscription(200, 250)])

        XCTAssertEqual(e2.subscriptions, [Subscription(200, 250)])

        XCTAssertEqual(e3.subscriptions, [Subscription(200, 250)])

        XCTAssertEqual(e4.subscriptions, [Subscription(200, 250)])

    }

    func testCombineLatest_WillNeverBeAbleToCombine5() {
        let scheduler = TestScheduler(initialClock: 0)
        

        let e0 = scheduler.createHotObservable([
            next(150, 1),
            completed(250)
        ])

        let e1 = scheduler.createHotObservable([
            next(150, 1),
            completed(260)
        ])

        let e2 = scheduler.createHotObservable([
            next(150, 1),
            completed(270)
        ])

        let e3 = scheduler.createHotObservable([
            next(150, 1),
            completed(280)
        ])

        let e4 = scheduler.createHotObservable([
            next(150, 1),
            next(500, 2),
            completed(800)
        ])

        let res = scheduler.start { () -> Observable<Int> in
            let result: Observable<Int> = combineLatest(e0, e1, e2, e3, e4) { (_, _, _, _, _) -> Int in
                return (42)
            }

            return result
        }

        XCTAssertEqual(res.messages, [
            completed(500)
        ])


        XCTAssertEqual(e0.subscriptions, [Subscription(200, 250)])

        XCTAssertEqual(e1.subscriptions, [Subscription(200, 260)])

        XCTAssertEqual(e2.subscriptions, [Subscription(200, 270)])

        XCTAssertEqual(e3.subscriptions, [Subscription(200, 280)])

        XCTAssertEqual(e4.subscriptions, [Subscription(200, 500)])
    }
    
    func testCombineLatest_Typical5() {
        let scheduler = TestScheduler(initialClock: 0)


        let e0 = scheduler.createHotObservable([
            next(150, 1),
            next(210, 1),
            next(410, 6),
            completed(800)
        ])

        let e1 = scheduler.createHotObservable([
            next(150, 1),
            next(220, 2),
            next(420, 7),
            completed(800)
        ])

        let e2 = scheduler.createHotObservable([
            next(150, 1),
            next(230, 3),
            next(430, 8),
            completed(800)
        ])

        let e3 = scheduler.createHotObservable([
            next(150, 1),
            next(240, 4),
            next(440, 9),
            completed(800)
        ])

        let e4 = scheduler.createHotObservable([
            next(150, 1),
            next(250, 5),
            next(450, 10),
            completed(800)
        ])

        let res = scheduler.start { () -> Observable<Int> in
            let result: Observable<Int> = combineLatest(e0, e1, e2, e3, e4) {
                return ($0 + $1 + $2 + $3 + $4)
            }

            return result
        }

        XCTAssertEqual(res.messages, [
            
            next(250, 15),

            next(410, 20),
            next(420, 25),
            next(430, 30),
            next(440, 35),
            next(450, 40),
            completed(800)
            ])


        XCTAssertEqual(e0.subscriptions, [Subscription(200, 800)])

        XCTAssertEqual(e1.subscriptions, [Subscription(200, 800)])

        XCTAssertEqual(e2.subscriptions, [Subscription(200, 800)])

        XCTAssertEqual(e3.subscriptions, [Subscription(200, 800)])

        XCTAssertEqual(e4.subscriptions, [Subscription(200, 800)])

    }




    // 6

    func testCombineLatest_Never6() {
        let scheduler = TestScheduler(initialClock: 0)


        let e0 = scheduler.createHotObservable([
            next(150, 1)
        ])

        let e1 = scheduler.createHotObservable([
            next(150, 1)
        ])

        let e2 = scheduler.createHotObservable([
            next(150, 1)
        ])

        let e3 = scheduler.createHotObservable([
            next(150, 1)
        ])

        let e4 = scheduler.createHotObservable([
            next(150, 1)
        ])

        let e5 = scheduler.createHotObservable([
            next(150, 1)
        ])


        let res = scheduler.start { () -> Observable<Int> in
            let result: Observable<Int> = combineLatest(e0, e1, e2, e3, e4, e5) { (_, _, _, _, _, _) -> Int in
                return (42)
            }

            return result
        }
        
        XCTAssertEqual(res.messages, [])
        
        let subscriptions = [Subscription(200, 1000)]
        

        XCTAssertEqual(e0.subscriptions, subscriptions)
        XCTAssertEqual(e1.subscriptions, subscriptions)
        XCTAssertEqual(e2.subscriptions, subscriptions)
        XCTAssertEqual(e3.subscriptions, subscriptions)
        XCTAssertEqual(e4.subscriptions, subscriptions)
        XCTAssertEqual(e5.subscriptions, subscriptions)
    }

    func testCombineLatest_Empty6() {
        let scheduler = TestScheduler(initialClock: 0)


        let e0 = scheduler.createHotObservable([
            next(150, 1),
            completed(210)
        ])

        let e1 = scheduler.createHotObservable([
            next(150, 1),
            completed(220)
        ])

        let e2 = scheduler.createHotObservable([
            next(150, 1),
            completed(230)
        ])

        let e3 = scheduler.createHotObservable([
            next(150, 1),
            completed(240)
        ])

        let e4 = scheduler.createHotObservable([
            next(150, 1),
            completed(250)
        ])

        let e5 = scheduler.createHotObservable([
            next(150, 1),
            completed(260)
        ])


        let res = scheduler.start { () -> Observable<Int> in
            let result: Observable<Int> = combineLatest(e0, e1, e2, e3, e4, e5) { (_, _, _, _, _, _) -> Int in
                return (42)
            }

            return result
        }

        XCTAssertEqual(res.messages, [completed(260)])


        XCTAssertEqual(e0.subscriptions, [Subscription(200, 210)])

        XCTAssertEqual(e1.subscriptions, [Subscription(200, 220)])

        XCTAssertEqual(e2.subscriptions, [Subscription(200, 230)])

        XCTAssertEqual(e3.subscriptions, [Subscription(200, 240)])

        XCTAssertEqual(e4.subscriptions, [Subscription(200, 250)])

        XCTAssertEqual(e5.subscriptions, [Subscription(200, 260)])

    }

    func testCombineLatest_SelectorThrows6() {
        let scheduler = TestScheduler(initialClock: 0)


        let e0 = scheduler.createHotObservable([
            next(150, 1),
            next(210, 1),
            completed(400)
        ])

        let e1 = scheduler.createHotObservable([
            next(150, 1),
            next(220, 2),
            completed(400)
        ])

        let e2 = scheduler.createHotObservable([
            next(150, 1),
            next(230, 3),
            completed(400)
        ])

        let e3 = scheduler.createHotObservable([
            next(150, 1),
            next(240, 4),
            completed(400)
        ])

        let e4 = scheduler.createHotObservable([
            next(150, 1),
            next(250, 5),
            completed(400)
        ])

        let e5 = scheduler.createHotObservable([
            next(150, 1),
            next(260, 6),
            completed(400)
        ])


        let res = scheduler.start { () -> Observable<Int> in
            let result: Observable<Int> = combineLatest(e0, e1, e2, e3, e4, e5) { (_, _, _, _, _, _) throws -> Int in
                throw testError
            }

            return result
        }
        
        XCTAssertEqual(res.messages, [
            error(260, testError)
        ])


        XCTAssertEqual(e0.subscriptions, [Subscription(200, 260)])

        XCTAssertEqual(e1.subscriptions, [Subscription(200, 260)])

        XCTAssertEqual(e2.subscriptions, [Subscription(200, 260)])

        XCTAssertEqual(e3.subscriptions, [Subscription(200, 260)])

        XCTAssertEqual(e4.subscriptions, [Subscription(200, 260)])

        XCTAssertEqual(e5.subscriptions, [Subscription(200, 260)])

    }

    func testCombineLatest_WillNeverBeAbleToCombine6() {
        let scheduler = TestScheduler(initialClock: 0)
        

        let e0 = scheduler.createHotObservable([
            next(150, 1),
            completed(250)
        ])

        let e1 = scheduler.createHotObservable([
            next(150, 1),
            completed(260)
        ])

        let e2 = scheduler.createHotObservable([
            next(150, 1),
            completed(270)
        ])

        let e3 = scheduler.createHotObservable([
            next(150, 1),
            completed(280)
        ])

        let e4 = scheduler.createHotObservable([
            next(150, 1),
            completed(290)
        ])

        let e5 = scheduler.createHotObservable([
            next(150, 1),
            next(500, 2),
            completed(800)
        ])

        let res = scheduler.start { () -> Observable<Int> in
            let result: Observable<Int> = combineLatest(e0, e1, e2, e3, e4, e5) { (_, _, _, _, _, _) -> Int in
                return (42)
            }

            return result
        }

        XCTAssertEqual(res.messages, [
            completed(500)
        ])


        XCTAssertEqual(e0.subscriptions, [Subscription(200, 250)])

        XCTAssertEqual(e1.subscriptions, [Subscription(200, 260)])

        XCTAssertEqual(e2.subscriptions, [Subscription(200, 270)])

        XCTAssertEqual(e3.subscriptions, [Subscription(200, 280)])

        XCTAssertEqual(e4.subscriptions, [Subscription(200, 290)])

        XCTAssertEqual(e5.subscriptions, [Subscription(200, 500)])
    }
    
    func testCombineLatest_Typical6() {
        let scheduler = TestScheduler(initialClock: 0)


        let e0 = scheduler.createHotObservable([
            next(150, 1),
            next(210, 1),
            next(410, 7),
            completed(800)
        ])

        let e1 = scheduler.createHotObservable([
            next(150, 1),
            next(220, 2),
            next(420, 8),
            completed(800)
        ])

        let e2 = scheduler.createHotObservable([
            next(150, 1),
            next(230, 3),
            next(430, 9),
            completed(800)
        ])

        let e3 = scheduler.createHotObservable([
            next(150, 1),
            next(240, 4),
            next(440, 10),
            completed(800)
        ])

        let e4 = scheduler.createHotObservable([
            next(150, 1),
            next(250, 5),
            next(450, 11),
            completed(800)
        ])

        let e5 = scheduler.createHotObservable([
            next(150, 1),
            next(260, 6),
            next(460, 12),
            completed(800)
        ])

        let res = scheduler.start { () -> Observable<Int> in
            let result: Observable<Int> = combineLatest(e0, e1, e2, e3, e4, e5) {
                return ($0 + $1 + $2 + $3 + $4 + $5)
            }

            return result
        }

        XCTAssertEqual(res.messages, [
            
            next(260, 21),

            next(410, 27),
            next(420, 33),
            next(430, 39),
            next(440, 45),
            next(450, 51),
            next(460, 57),
            completed(800)
            ])


        XCTAssertEqual(e0.subscriptions, [Subscription(200, 800)])

        XCTAssertEqual(e1.subscriptions, [Subscription(200, 800)])

        XCTAssertEqual(e2.subscriptions, [Subscription(200, 800)])

        XCTAssertEqual(e3.subscriptions, [Subscription(200, 800)])

        XCTAssertEqual(e4.subscriptions, [Subscription(200, 800)])

        XCTAssertEqual(e5.subscriptions, [Subscription(200, 800)])

    }




    // 7

    func testCombineLatest_Never7() {
        let scheduler = TestScheduler(initialClock: 0)


        let e0 = scheduler.createHotObservable([
            next(150, 1)
        ])

        let e1 = scheduler.createHotObservable([
            next(150, 1)
        ])

        let e2 = scheduler.createHotObservable([
            next(150, 1)
        ])

        let e3 = scheduler.createHotObservable([
            next(150, 1)
        ])

        let e4 = scheduler.createHotObservable([
            next(150, 1)
        ])

        let e5 = scheduler.createHotObservable([
            next(150, 1)
        ])

        let e6 = scheduler.createHotObservable([
            next(150, 1)
        ])


        let res = scheduler.start { () -> Observable<Int> in
            let result: Observable<Int> = combineLatest(e0, e1, e2, e3, e4, e5, e6) { (_, _, _, _, _, _, _) -> Int in
                return (42)
            }

            return result
        }
        
        XCTAssertEqual(res.messages, [])
        
        let subscriptions = [Subscription(200, 1000)]
        

        XCTAssertEqual(e0.subscriptions, subscriptions)
        XCTAssertEqual(e1.subscriptions, subscriptions)
        XCTAssertEqual(e2.subscriptions, subscriptions)
        XCTAssertEqual(e3.subscriptions, subscriptions)
        XCTAssertEqual(e4.subscriptions, subscriptions)
        XCTAssertEqual(e5.subscriptions, subscriptions)
        XCTAssertEqual(e6.subscriptions, subscriptions)
    }

    func testCombineLatest_Empty7() {
        let scheduler = TestScheduler(initialClock: 0)


        let e0 = scheduler.createHotObservable([
            next(150, 1),
            completed(210)
        ])

        let e1 = scheduler.createHotObservable([
            next(150, 1),
            completed(220)
        ])

        let e2 = scheduler.createHotObservable([
            next(150, 1),
            completed(230)
        ])

        let e3 = scheduler.createHotObservable([
            next(150, 1),
            completed(240)
        ])

        let e4 = scheduler.createHotObservable([
            next(150, 1),
            completed(250)
        ])

        let e5 = scheduler.createHotObservable([
            next(150, 1),
            completed(260)
        ])

        let e6 = scheduler.createHotObservable([
            next(150, 1),
            completed(270)
        ])


        let res = scheduler.start { () -> Observable<Int> in
            let result: Observable<Int> = combineLatest(e0, e1, e2, e3, e4, e5, e6) { (_, _, _, _, _, _, _) -> Int in
                return (42)
            }

            return result
        }

        XCTAssertEqual(res.messages, [completed(270)])


        XCTAssertEqual(e0.subscriptions, [Subscription(200, 210)])

        XCTAssertEqual(e1.subscriptions, [Subscription(200, 220)])

        XCTAssertEqual(e2.subscriptions, [Subscription(200, 230)])

        XCTAssertEqual(e3.subscriptions, [Subscription(200, 240)])

        XCTAssertEqual(e4.subscriptions, [Subscription(200, 250)])

        XCTAssertEqual(e5.subscriptions, [Subscription(200, 260)])

        XCTAssertEqual(e6.subscriptions, [Subscription(200, 270)])

    }

    func testCombineLatest_SelectorThrows7() {
        let scheduler = TestScheduler(initialClock: 0)


        let e0 = scheduler.createHotObservable([
            next(150, 1),
            next(210, 1),
            completed(400)
        ])

        let e1 = scheduler.createHotObservable([
            next(150, 1),
            next(220, 2),
            completed(400)
        ])

        let e2 = scheduler.createHotObservable([
            next(150, 1),
            next(230, 3),
            completed(400)
        ])

        let e3 = scheduler.createHotObservable([
            next(150, 1),
            next(240, 4),
            completed(400)
        ])

        let e4 = scheduler.createHotObservable([
            next(150, 1),
            next(250, 5),
            completed(400)
        ])

        let e5 = scheduler.createHotObservable([
            next(150, 1),
            next(260, 6),
            completed(400)
        ])

        let e6 = scheduler.createHotObservable([
            next(150, 1),
            next(270, 7),
            completed(400)
        ])


        let res = scheduler.start { () -> Observable<Int> in
            let result: Observable<Int> = combineLatest(e0, e1, e2, e3, e4, e5, e6) { (_, _, _, _, _, _, _) throws -> Int in
                throw testError
            }

            return result
        }
        
        XCTAssertEqual(res.messages, [
            error(270, testError)
        ])


        XCTAssertEqual(e0.subscriptions, [Subscription(200, 270)])

        XCTAssertEqual(e1.subscriptions, [Subscription(200, 270)])

        XCTAssertEqual(e2.subscriptions, [Subscription(200, 270)])

        XCTAssertEqual(e3.subscriptions, [Subscription(200, 270)])

        XCTAssertEqual(e4.subscriptions, [Subscription(200, 270)])

        XCTAssertEqual(e5.subscriptions, [Subscription(200, 270)])

        XCTAssertEqual(e6.subscriptions, [Subscription(200, 270)])

    }

    func testCombineLatest_WillNeverBeAbleToCombine7() {
        let scheduler = TestScheduler(initialClock: 0)
        

        let e0 = scheduler.createHotObservable([
            next(150, 1),
            completed(250)
        ])

        let e1 = scheduler.createHotObservable([
            next(150, 1),
            completed(260)
        ])

        let e2 = scheduler.createHotObservable([
            next(150, 1),
            completed(270)
        ])

        let e3 = scheduler.createHotObservable([
            next(150, 1),
            completed(280)
        ])

        let e4 = scheduler.createHotObservable([
            next(150, 1),
            completed(290)
        ])

        let e5 = scheduler.createHotObservable([
            next(150, 1),
            completed(300)
        ])

        let e6 = scheduler.createHotObservable([
            next(150, 1),
            next(500, 2),
            completed(800)
        ])

        let res = scheduler.start { () -> Observable<Int> in
            let result: Observable<Int> = combineLatest(e0, e1, e2, e3, e4, e5, e6) { (_, _, _, _, _, _, _) -> Int in
                return (42)
            }

            return result
        }

        XCTAssertEqual(res.messages, [
            completed(500)
        ])


        XCTAssertEqual(e0.subscriptions, [Subscription(200, 250)])

        XCTAssertEqual(e1.subscriptions, [Subscription(200, 260)])

        XCTAssertEqual(e2.subscriptions, [Subscription(200, 270)])

        XCTAssertEqual(e3.subscriptions, [Subscription(200, 280)])

        XCTAssertEqual(e4.subscriptions, [Subscription(200, 290)])

        XCTAssertEqual(e5.subscriptions, [Subscription(200, 300)])

        XCTAssertEqual(e6.subscriptions, [Subscription(200, 500)])
    }
    
    func testCombineLatest_Typical7() {
        let scheduler = TestScheduler(initialClock: 0)


        let e0 = scheduler.createHotObservable([
            next(150, 1),
            next(210, 1),
            next(410, 8),
            completed(800)
        ])

        let e1 = scheduler.createHotObservable([
            next(150, 1),
            next(220, 2),
            next(420, 9),
            completed(800)
        ])

        let e2 = scheduler.createHotObservable([
            next(150, 1),
            next(230, 3),
            next(430, 10),
            completed(800)
        ])

        let e3 = scheduler.createHotObservable([
            next(150, 1),
            next(240, 4),
            next(440, 11),
            completed(800)
        ])

        let e4 = scheduler.createHotObservable([
            next(150, 1),
            next(250, 5),
            next(450, 12),
            completed(800)
        ])

        let e5 = scheduler.createHotObservable([
            next(150, 1),
            next(260, 6),
            next(460, 13),
            completed(800)
        ])

        let e6 = scheduler.createHotObservable([
            next(150, 1),
            next(270, 7),
            next(470, 14),
            completed(800)
        ])

        let res = scheduler.start { () -> Observable<Int> in
            let result: Observable<Int> = combineLatest(e0, e1, e2, e3, e4, e5, e6) {
                return ($0 + $1 + $2 + $3 + $4 + $5 + $6)
            }

            return result
        }

        XCTAssertEqual(res.messages, [
            
            next(270, 28),

            next(410, 35),
            next(420, 42),
            next(430, 49),
            next(440, 56),
            next(450, 63),
            next(460, 70),
            next(470, 77),
            completed(800)
            ])


        XCTAssertEqual(e0.subscriptions, [Subscription(200, 800)])

        XCTAssertEqual(e1.subscriptions, [Subscription(200, 800)])

        XCTAssertEqual(e2.subscriptions, [Subscription(200, 800)])

        XCTAssertEqual(e3.subscriptions, [Subscription(200, 800)])

        XCTAssertEqual(e4.subscriptions, [Subscription(200, 800)])

        XCTAssertEqual(e5.subscriptions, [Subscription(200, 800)])

        XCTAssertEqual(e6.subscriptions, [Subscription(200, 800)])

    }




    // 8

    func testCombineLatest_Never8() {
        let scheduler = TestScheduler(initialClock: 0)


        let e0 = scheduler.createHotObservable([
            next(150, 1)
        ])

        let e1 = scheduler.createHotObservable([
            next(150, 1)
        ])

        let e2 = scheduler.createHotObservable([
            next(150, 1)
        ])

        let e3 = scheduler.createHotObservable([
            next(150, 1)
        ])

        let e4 = scheduler.createHotObservable([
            next(150, 1)
        ])

        let e5 = scheduler.createHotObservable([
            next(150, 1)
        ])

        let e6 = scheduler.createHotObservable([
            next(150, 1)
        ])

        let e7 = scheduler.createHotObservable([
            next(150, 1)
        ])


        let res = scheduler.start { () -> Observable<Int> in
            let result: Observable<Int> = combineLatest(e0, e1, e2, e3, e4, e5, e6, e7) { (_, _, _, _, _, _, _, _) -> Int in
                return (42)
            }

            return result
        }
        
        XCTAssertEqual(res.messages, [])
        
        let subscriptions = [Subscription(200, 1000)]
        

        XCTAssertEqual(e0.subscriptions, subscriptions)
        XCTAssertEqual(e1.subscriptions, subscriptions)
        XCTAssertEqual(e2.subscriptions, subscriptions)
        XCTAssertEqual(e3.subscriptions, subscriptions)
        XCTAssertEqual(e4.subscriptions, subscriptions)
        XCTAssertEqual(e5.subscriptions, subscriptions)
        XCTAssertEqual(e6.subscriptions, subscriptions)
        XCTAssertEqual(e7.subscriptions, subscriptions)
    }

    func testCombineLatest_Empty8() {
        let scheduler = TestScheduler(initialClock: 0)


        let e0 = scheduler.createHotObservable([
            next(150, 1),
            completed(210)
        ])

        let e1 = scheduler.createHotObservable([
            next(150, 1),
            completed(220)
        ])

        let e2 = scheduler.createHotObservable([
            next(150, 1),
            completed(230)
        ])

        let e3 = scheduler.createHotObservable([
            next(150, 1),
            completed(240)
        ])

        let e4 = scheduler.createHotObservable([
            next(150, 1),
            completed(250)
        ])

        let e5 = scheduler.createHotObservable([
            next(150, 1),
            completed(260)
        ])

        let e6 = scheduler.createHotObservable([
            next(150, 1),
            completed(270)
        ])

        let e7 = scheduler.createHotObservable([
            next(150, 1),
            completed(280)
        ])


        let res = scheduler.start { () -> Observable<Int> in
            let result: Observable<Int> = combineLatest(e0, e1, e2, e3, e4, e5, e6, e7) { (_, _, _, _, _, _, _, _) -> Int in
                return (42)
            }

            return result
        }

        XCTAssertEqual(res.messages, [completed(280)])


        XCTAssertEqual(e0.subscriptions, [Subscription(200, 210)])

        XCTAssertEqual(e1.subscriptions, [Subscription(200, 220)])

        XCTAssertEqual(e2.subscriptions, [Subscription(200, 230)])

        XCTAssertEqual(e3.subscriptions, [Subscription(200, 240)])

        XCTAssertEqual(e4.subscriptions, [Subscription(200, 250)])

        XCTAssertEqual(e5.subscriptions, [Subscription(200, 260)])

        XCTAssertEqual(e6.subscriptions, [Subscription(200, 270)])

        XCTAssertEqual(e7.subscriptions, [Subscription(200, 280)])

    }

    func testCombineLatest_SelectorThrows8() {
        let scheduler = TestScheduler(initialClock: 0)


        let e0 = scheduler.createHotObservable([
            next(150, 1),
            next(210, 1),
            completed(400)
        ])

        let e1 = scheduler.createHotObservable([
            next(150, 1),
            next(220, 2),
            completed(400)
        ])

        let e2 = scheduler.createHotObservable([
            next(150, 1),
            next(230, 3),
            completed(400)
        ])

        let e3 = scheduler.createHotObservable([
            next(150, 1),
            next(240, 4),
            completed(400)
        ])

        let e4 = scheduler.createHotObservable([
            next(150, 1),
            next(250, 5),
            completed(400)
        ])

        let e5 = scheduler.createHotObservable([
            next(150, 1),
            next(260, 6),
            completed(400)
        ])

        let e6 = scheduler.createHotObservable([
            next(150, 1),
            next(270, 7),
            completed(400)
        ])

        let e7 = scheduler.createHotObservable([
            next(150, 1),
            next(280, 8),
            completed(400)
        ])


        let res = scheduler.start { () -> Observable<Int> in
            let result: Observable<Int> = combineLatest(e0, e1, e2, e3, e4, e5, e6, e7) { (_, _, _, _, _, _, _, _) throws -> Int in
                throw testError
            }

            return result
        }
        
        XCTAssertEqual(res.messages, [
            error(280, testError)
        ])


        XCTAssertEqual(e0.subscriptions, [Subscription(200, 280)])

        XCTAssertEqual(e1.subscriptions, [Subscription(200, 280)])

        XCTAssertEqual(e2.subscriptions, [Subscription(200, 280)])

        XCTAssertEqual(e3.subscriptions, [Subscription(200, 280)])

        XCTAssertEqual(e4.subscriptions, [Subscription(200, 280)])

        XCTAssertEqual(e5.subscriptions, [Subscription(200, 280)])

        XCTAssertEqual(e6.subscriptions, [Subscription(200, 280)])

        XCTAssertEqual(e7.subscriptions, [Subscription(200, 280)])

    }

    func testCombineLatest_WillNeverBeAbleToCombine8() {
        let scheduler = TestScheduler(initialClock: 0)
        

        let e0 = scheduler.createHotObservable([
            next(150, 1),
            completed(250)
        ])

        let e1 = scheduler.createHotObservable([
            next(150, 1),
            completed(260)
        ])

        let e2 = scheduler.createHotObservable([
            next(150, 1),
            completed(270)
        ])

        let e3 = scheduler.createHotObservable([
            next(150, 1),
            completed(280)
        ])

        let e4 = scheduler.createHotObservable([
            next(150, 1),
            completed(290)
        ])

        let e5 = scheduler.createHotObservable([
            next(150, 1),
            completed(300)
        ])

        let e6 = scheduler.createHotObservable([
            next(150, 1),
            completed(310)
        ])

        let e7 = scheduler.createHotObservable([
            next(150, 1),
            next(500, 2),
            completed(800)
        ])

        let res = scheduler.start { () -> Observable<Int> in
            let result: Observable<Int> = combineLatest(e0, e1, e2, e3, e4, e5, e6, e7) { (_, _, _, _, _, _, _, _) -> Int in
                return (42)
            }

            return result
        }

        XCTAssertEqual(res.messages, [
            completed(500)
        ])


        XCTAssertEqual(e0.subscriptions, [Subscription(200, 250)])

        XCTAssertEqual(e1.subscriptions, [Subscription(200, 260)])

        XCTAssertEqual(e2.subscriptions, [Subscription(200, 270)])

        XCTAssertEqual(e3.subscriptions, [Subscription(200, 280)])

        XCTAssertEqual(e4.subscriptions, [Subscription(200, 290)])

        XCTAssertEqual(e5.subscriptions, [Subscription(200, 300)])

        XCTAssertEqual(e6.subscriptions, [Subscription(200, 310)])

        XCTAssertEqual(e7.subscriptions, [Subscription(200, 500)])
    }
    
    func testCombineLatest_Typical8() {
        let scheduler = TestScheduler(initialClock: 0)


        let e0 = scheduler.createHotObservable([
            next(150, 1),
            next(210, 1),
            next(410, 9),
            completed(800)
        ])

        let e1 = scheduler.createHotObservable([
            next(150, 1),
            next(220, 2),
            next(420, 10),
            completed(800)
        ])

        let e2 = scheduler.createHotObservable([
            next(150, 1),
            next(230, 3),
            next(430, 11),
            completed(800)
        ])

        let e3 = scheduler.createHotObservable([
            next(150, 1),
            next(240, 4),
            next(440, 12),
            completed(800)
        ])

        let e4 = scheduler.createHotObservable([
            next(150, 1),
            next(250, 5),
            next(450, 13),
            completed(800)
        ])

        let e5 = scheduler.createHotObservable([
            next(150, 1),
            next(260, 6),
            next(460, 14),
            completed(800)
        ])

        let e6 = scheduler.createHotObservable([
            next(150, 1),
            next(270, 7),
            next(470, 15),
            completed(800)
        ])

        let e7 = scheduler.createHotObservable([
            next(150, 1),
            next(280, 8),
            next(480, 16),
            completed(800)
        ])

        let res = scheduler.start { () -> Observable<Int> in
            let result: Observable<Int> = combineLatest(e0, e1, e2, e3, e4, e5, e6, e7) {
                return ($0 + $1 + $2 + $3 + $4 + $5 + $6 + $7)
            }

            return result
        }

        XCTAssertEqual(res.messages, [
            
            next(280, 36),

            next(410, 44),
            next(420, 52),
            next(430, 60),
            next(440, 68),
            next(450, 76),
            next(460, 84),
            next(470, 92),
            next(480, 100),
            completed(800)
            ])


        XCTAssertEqual(e0.subscriptions, [Subscription(200, 800)])

        XCTAssertEqual(e1.subscriptions, [Subscription(200, 800)])

        XCTAssertEqual(e2.subscriptions, [Subscription(200, 800)])

        XCTAssertEqual(e3.subscriptions, [Subscription(200, 800)])

        XCTAssertEqual(e4.subscriptions, [Subscription(200, 800)])

        XCTAssertEqual(e5.subscriptions, [Subscription(200, 800)])

        XCTAssertEqual(e6.subscriptions, [Subscription(200, 800)])

        XCTAssertEqual(e7.subscriptions, [Subscription(200, 800)])

    }




    func testCombineLatest_NeverEmpty() {
        let scheduler = TestScheduler(initialClock: 0)

        let e0 = scheduler.createHotObservable([
            next(150, 1)
        ])

        let e1 = scheduler.createHotObservable([
            next(150, 1),
            completed(210)
        ])
        
        let res = scheduler.start {
            combineLatest(e0, e1) { (x1, x2) -> Int in
                return (x1 + x2)
            }
        }

        XCTAssertEqual(res.messages, [])
        
        XCTAssertEqual(e0.subscriptions, [Subscription(200, 1000)])
        XCTAssertEqual(e1.subscriptions, [Subscription(200, 210)])
    }
    
    func testCombineLatest_EmptyNever() {
        let scheduler = TestScheduler(initialClock: 0)
        
        let e0 = scheduler.createHotObservable([
            next(150, 1),
            completed(210)
            ])
        
        let e1 = scheduler.createHotObservable([
            next(150, 1)
            ])
        
        let res = scheduler.start {
            combineLatest(e0, e1) { (x1, x2) -> Int in
                return (x1 + x2)
            }
        }
        
        XCTAssertEqual(res.messages, [])
        
        XCTAssertEqual(e0.subscriptions, [Subscription(200, 210)])
        XCTAssertEqual(e1.subscriptions, [Subscription(200, 1000)])
    }
    

    func testCombineLatest_EmptyReturn() {
        let scheduler = TestScheduler(initialClock: 0)
        
        let e0 = scheduler.createHotObservable([
            next(150, 1),
            completed(210)
            ])
        
        let e1 = scheduler.createHotObservable([
            next(150, 1),
            next(215, 2),
            completed(220)
            ])
        
        let res = scheduler.start {
            combineLatest(e0, e1) { (x1, x2) -> Int in
                return (x1 + x2)
            }
        }
        
        XCTAssertEqual(res.messages, [completed(215)])
        
        XCTAssertEqual(e0.subscriptions, [Subscription(200, 210)])
        XCTAssertEqual(e1.subscriptions, [Subscription(200, 215)])
    }
    
    func testCombineLatest_ReturnEmpty() {
        let scheduler = TestScheduler(initialClock: 0)
        
        let e0 = scheduler.createHotObservable([
            next(150, 1),
            next(215, 2),
            completed(220)
            ])
        
        let e1 = scheduler.createHotObservable([
            next(150, 1),
            completed(210)
            ])
        
        let res = scheduler.start {
            combineLatest(e0, e1) { (x1, x2) -> Int in
                return (x1 + x2)
            }
        }
        
        XCTAssertEqual(res.messages, [completed(215)])
        
        XCTAssertEqual(e0.subscriptions, [Subscription(200, 215)])
        XCTAssertEqual(e1.subscriptions, [Subscription(200, 210)])
    }
    
    func testCombineLatest_NeverReturn() {
        let scheduler = TestScheduler(initialClock: 0)
        
        let e0 = scheduler.createHotObservable([
            next(150, 1),
            next(215, 2),
            completed(220)
            ])
        
        let e1 = scheduler.createHotObservable([
            next(150, 1),
            ])
        
        let res = scheduler.start {
            combineLatest(e0, e1) { (x1, x2) -> Int in
                return (x1 + x2)
            }
        }
        
        XCTAssertEqual(res.messages, [])
        
        XCTAssertEqual(e0.subscriptions, [Subscription(200, 220)])
        XCTAssertEqual(e1.subscriptions, [Subscription(200, 1000)])
    }

    func testCombineLatest_ReturnNever() {
        let scheduler = TestScheduler(initialClock: 0)
        
        let e0 = scheduler.createHotObservable([
            next(150, 1),
            ])
        
        let e1 = scheduler.createHotObservable([
            next(150, 1),
            next(215, 2),
            completed(220)
            ])
        
        let res = scheduler.start {
            combineLatest(e0, e1) { (x1, x2) -> Int in
                return (x1 + x2)
            }
        }
        
        XCTAssertEqual(res.messages, [])
        
        XCTAssertEqual(e0.subscriptions, [Subscription(200, 1000)])
        XCTAssertEqual(e1.subscriptions, [Subscription(200, 220)])
    }
    
    func testCombineLatest_ReturnReturn1() {
        let scheduler = TestScheduler(initialClock: 0)
        
        let e0 = scheduler.createHotObservable([
            next(150, 1),
            next(215, 2),
            completed(230)
            ])
        
        let e1 = scheduler.createHotObservable([
            next(150, 1),
            next(220, 3),
            completed(240)
            ])
        
        let res = scheduler.start {
            combineLatest(e0, e1) { (x1, x2) -> Int in
                return (x1 + x2)
            }
        }
        
        XCTAssertEqual(res.messages, [next(220, (2 + 3)), completed(240)])
        
        XCTAssertEqual(e0.subscriptions, [Subscription(200, 230)])
        XCTAssertEqual(e1.subscriptions, [Subscription(200, 240)])
    }

    func testCombineLatest_ReturnReturn2() {
        let scheduler = TestScheduler(initialClock: 0)
        
        let e0 = scheduler.createHotObservable([
            next(150, 1),
            next(220, 3),
            completed(240)
            ])
        
        let e1 = scheduler.createHotObservable([
            next(150, 1),
            next(215, 2),
            completed(230)
            ])
        
        let res = scheduler.start {
            combineLatest(e0, e1) { (x1, x2) -> Int in
                return (x1 + x2)
            }
        }
        
        XCTAssertEqual(res.messages, [next(220, (2 + 3)), completed(240)])
        
        XCTAssertEqual(e0.subscriptions, [Subscription(200, 240)])
        XCTAssertEqual(e1.subscriptions, [Subscription(200, 230)])
    }
    
    func testCombineLatest_EmptyError() {
        let scheduler = TestScheduler(initialClock: 0)
        
        let e0 = scheduler.createHotObservable([
            next(150, 1),
            completed(230)
            ])
        
        let e1 = scheduler.createHotObservable([
            next(150, 1),
            error(220, testError)
            ])
        
        let res = scheduler.start {
            combineLatest(e0, e1) { (x1, x2) -> Int in
                return (x1 + x2)
            }
        }
        
        XCTAssertEqual(res.messages, [error(220, testError)])
        
        XCTAssertEqual(e0.subscriptions, [Subscription(200, 220)])
        XCTAssertEqual(e1.subscriptions, [Subscription(200, 220)])
    }
    
    func testCombineLatest_ErrorEmpty() {
        let scheduler = TestScheduler(initialClock: 0)
        
        let e0 = scheduler.createHotObservable([
            next(150, 1),
            error(220, testError)
            ])
        
        let e1 = scheduler.createHotObservable([
            next(150, 1),
            completed(230)
            ])
        
        let res = scheduler.start {
            combineLatest(e0, e1) { (x1, x2) -> Int in
                return (x1 + x2)
            }
        }
        
        XCTAssertEqual(res.messages, [error(220, testError)])
        
        XCTAssertEqual(e0.subscriptions, [Subscription(200, 220)])
        XCTAssertEqual(e1.subscriptions, [Subscription(200, 220)])
    }
    
    func testCombineLatest_ReturnThrow() {
        let scheduler = TestScheduler(initialClock: 0)
        
        let e0 = scheduler.createHotObservable([
            next(150, 1),
            next(210, 2),
            completed(230)
            ])
        
        let e1 = scheduler.createHotObservable([
            next(150, 1),
            error(220, testError)
            ])
        
        let res = scheduler.start {
            combineLatest(e0, e1) { (x1, x2) -> Int in
                return (x1 + x2)
            }
        }
        
        XCTAssertEqual(res.messages, [error(220, testError)])
        
        XCTAssertEqual(e0.subscriptions, [Subscription(200, 220)])
        XCTAssertEqual(e1.subscriptions, [Subscription(200, 220)])
    }
    
    func testCombineLatest_ThrowReturn() {
        let scheduler = TestScheduler(initialClock: 0)
        
        let e0 = scheduler.createHotObservable([
            next(150, 1),
            error(220, testError)
            ])
        
        let e1 = scheduler.createHotObservable([
            next(150, 1),
            next(210, 2),
            completed(230)
            ])
        
        let res = scheduler.start {
            combineLatest(e0, e1) { (x1, x2) -> Int in
                return (x1 + x2)
            }
        }
        
        XCTAssertEqual(res.messages, [error(220, testError)])
        
        XCTAssertEqual(e0.subscriptions, [Subscription(200, 220)])
        XCTAssertEqual(e1.subscriptions, [Subscription(200, 220)])
    }
    
    func testCombineLatest_ThrowThrow1() {
        let scheduler = TestScheduler(initialClock: 0)
        
        let e0 = scheduler.createHotObservable([
            next(150, 1),
            error(220, testError1),
            ])
        
        let e1 = scheduler.createHotObservable([
            next(150, 1),
            error(230, testError2),
            ])
        
        let res = scheduler.start {
            combineLatest(e0, e1) { (x1, x2) -> Int in
                return (x1 + x2)
            }
        }
        
        XCTAssertEqual(res.messages, [error(220, testError1)])
        
        XCTAssertEqual(e0.subscriptions, [Subscription(200, 220)])
        XCTAssertEqual(e1.subscriptions, [Subscription(200, 220)])
    }
    
    func testCombineLatest_ThrowThrow2() {
        let scheduler = TestScheduler(initialClock: 0)
        
        let e0 = scheduler.createHotObservable([
            next(150, 1),
            error(230, testError1),
            ])
        
        let e1 = scheduler.createHotObservable([
            next(150, 1),
            error(220, testError2),
            ])
        
        let res = scheduler.start {
            combineLatest(e0, e1) { (x1, x2) -> Int in
                return (x1 + x2)
            }
        }
        
        XCTAssertEqual(res.messages, [error(220, testError2)])
        
        XCTAssertEqual(e0.subscriptions, [Subscription(200, 220)])
        XCTAssertEqual(e1.subscriptions, [Subscription(200, 220)])
    }
    
    func testCombineLatest_ErrorThrow() {
        let scheduler = TestScheduler(initialClock: 0)
        
        let e0 = scheduler.createHotObservable([
            next(150, 1),
            next(210, 2),
            error(220, testError1),
            ])
        
        let e1 = scheduler.createHotObservable([
            next(150, 1),
            error(230, testError2),
            ])
        
        let res = scheduler.start {
            combineLatest(e0, e1) { (x1, x2) -> Int in
                return (x1 + x2)
            }
        }
        
        XCTAssertEqual(res.messages, [error(220, testError1)])
        
        XCTAssertEqual(e0.subscriptions, [Subscription(200, 220)])
        XCTAssertEqual(e1.subscriptions, [Subscription(200, 220)])
    }
    
    func testCombineLatest_ThrowError() {
        let scheduler = TestScheduler(initialClock: 0)
        
        let e0 = scheduler.createHotObservable([
            next(150, 1),
            error(230, testError2),
            ])
        
        let e1 = scheduler.createHotObservable([
            next(150, 1),
            next(210, 2),
            error(220, testError1),
            ])
        
        let res = scheduler.start {
            combineLatest(e0, e1) { (x1, x2) -> Int in
                return (x1 + x2)
            }
        }
        
        XCTAssertEqual(res.messages, [error(220, testError1)])
        
        XCTAssertEqual(e0.subscriptions, [Subscription(200, 220)])
        XCTAssertEqual(e1.subscriptions, [Subscription(200, 220)])
    }
    
    func testCombineLatest_SomeThrow() {
        let scheduler = TestScheduler(initialClock: 0)
        
        let e0 = scheduler.createHotObservable([
            next(150, 1),
            next(215, 2),
            completed(230)
            ])
        
        let e1 = scheduler.createHotObservable([
            next(150, 1),
            error(220, testError),
            ])
        
        let res = scheduler.start {
            combineLatest(e0, e1) { (x1, x2) -> Int in
                return (x1 + x2)
            }
        }
        
        XCTAssertEqual(res.messages, [error(220, testError)])
        
        XCTAssertEqual(e0.subscriptions, [Subscription(200, 220)])
        XCTAssertEqual(e1.subscriptions, [Subscription(200, 220)])
    }
    
    func testCombineLatest_ThrowSome() {
        let scheduler = TestScheduler(initialClock: 0)
        
        let e0 = scheduler.createHotObservable([
            next(150, 1),
            error(220, testError),
            ])
        
        let e1 = scheduler.createHotObservable([
            next(150, 1),
            next(215, 2),
            completed(230)
            ])
        
        let res = scheduler.start {
            combineLatest(e0, e1) { (x1, x2) -> Int in
                return (x1 + x2)
            }
        }
        
        XCTAssertEqual(res.messages, [error(220, testError)])
        
        XCTAssertEqual(e0.subscriptions, [Subscription(200, 220)])
        XCTAssertEqual(e1.subscriptions, [Subscription(200, 220)])
    }
    
    func testCombineLatest_ThrowAfterCompleteLeft() {
        let scheduler = TestScheduler(initialClock: 0)
        
        let e0 = scheduler.createHotObservable([
            next(150, 1),
            next(215, 2),
            completed(220)
            ])
        
        let e1 = scheduler.createHotObservable([
            next(150, 1),
            error(230, testError),
            ])
        
        let res = scheduler.start {
            combineLatest(e0, e1) { (x1, x2) -> Int in
                return (x1 + x2)
            }
        }
        
        XCTAssertEqual(res.messages, [error(230, testError)])
        
        XCTAssertEqual(e0.subscriptions, [Subscription(200, 220)])
        XCTAssertEqual(e1.subscriptions, [Subscription(200, 230)])
    }
    
    func testCombineLatest_ThrowAfterCompleteRight() {
        let scheduler = TestScheduler(initialClock: 0)
        
        let e0 = scheduler.createHotObservable([
            next(150, 1),
            error(230, testError),
            ])
        
        let e1 = scheduler.createHotObservable([
            next(150, 1),
            next(215, 2),
            completed(220)
            ])
        
        let res = scheduler.start {
            combineLatest(e0, e1) { (x1, x2) -> Int in
                return (x1 + x2)
            }
        }
        
        XCTAssertEqual(res.messages, [error(230, testError)])
        
        XCTAssertEqual(e0.subscriptions, [Subscription(200, 230)])
        XCTAssertEqual(e1.subscriptions, [Subscription(200, 220)])
    }
    
    func testCombineLatest_TestInterleavedWithTail() {
        let scheduler = TestScheduler(initialClock: 0)
        
        let e0 = scheduler.createHotObservable([
            next(150, 1),
            next(215, 2),
            next(225, 4),
            completed(230)
            ])
        
        let e1 = scheduler.createHotObservable([
            next(150, 1),
            next(220, 3),
            next(230, 5),
            next(235, 6),
            next(240, 7),
            completed(250)
            ])
        
        let res = scheduler.start {
            combineLatest(e0, e1) { (x1, x2) -> Int in
                return (x1 + x2)
            }
        }
        
        let messages = [
            next(220, 2 + 3),
            next(225, 3 + 4),
            next(230, 4 + 5),
            next(235, 4 + 6),
            next(240, 4 + 7),
            completed(250)
        ]
        
        XCTAssertEqual(res.messages, messages)
        
        XCTAssertEqual(e0.subscriptions, [Subscription(200, 230)])
        XCTAssertEqual(e1.subscriptions, [Subscription(200, 250)])
    }
    
    func testCombineLatest_Consecutive() {
        let scheduler = TestScheduler(initialClock: 0)
        
        let e0 = scheduler.createHotObservable([
            next(150, 1),
            next(215, 2),
            next(225, 4),
            completed(230)
            ])
        
        let e1 = scheduler.createHotObservable([
            next(150, 1),
            next(235, 6),
            next(240, 7),
            completed(250)
            ])
        
        let res = scheduler.start {
            combineLatest(e0, e1) { (x1, x2) -> Int in
                return (x1 + x2)
            }
        }
        
        let messages = [
            next(235, 4 + 6),
            next(240, 4 + 7),
            completed(250)
        ]
        
        XCTAssertEqual(res.messages, messages)
        
        XCTAssertEqual(e0.subscriptions, [Subscription(200, 230)])
        XCTAssertEqual(e1.subscriptions, [Subscription(200, 250)])
    }
    
    func testCombineLatest_ConsecutiveEndWithErrorLeft() {
        let scheduler = TestScheduler(initialClock: 0)
        
        let e0 = scheduler.createHotObservable([
            next(150, 1),
            next(215, 2),
            next(225, 4),
            error(230, testError)
            ])
        
        let e1 = scheduler.createHotObservable([
            next(150, 1),
            next(235, 6),
            next(240, 7),
            completed(250)
            ])
        
        let res = scheduler.start {
            combineLatest(e0, e1) { (x1, x2) -> Int in
                return (x1 + x2)
            }
        }
        
        XCTAssertEqual(res.messages, [error(230, testError)])
        
        XCTAssertEqual(e0.subscriptions, [Subscription(200, 230)])
        XCTAssertEqual(e1.subscriptions, [Subscription(200, 230)])
    }
    
    func testCombineLatest_ConsecutiveEndWithErrorRight() {
        let scheduler = TestScheduler(initialClock: 0)
        
        let e0 = scheduler.createHotObservable([
            next(150, 1),
            next(215, 2),
            next(225, 4),
            completed(250)
            ])
        
        let e1 = scheduler.createHotObservable([
            next(150, 1),
            next(235, 6),
            next(240, 7),
            error(245, testError)
            ])
        
        let res = scheduler.start {
            combineLatest(e0, e1) { (x1, x2) -> Int in
                return (x1 + x2)
            }
        }
        
        XCTAssertEqual(res.messages, [
            next(235, 4 + 6),
            next(240, 4 + 7),
            error(245, testError)
            ])
        
        XCTAssertEqual(e0.subscriptions, [Subscription(200, 245)])
        XCTAssertEqual(e1.subscriptions, [Subscription(200, 245)])
    }

}