added whitespace checks to assert statement

src/checkstyle/com/puppycrawl/tools/checkstyle/java14.g

@@ -53,7 +53,13 @@ assertStatement[int[] aType, MyCommonAST[] aCurlies]
     final MyCommonAST[] stmtBraces = new MyCommonAST[2];
     stmtType[0] = STMT_OTHER;
 }
-	:	ASSERT^ expression ( COLON! expression )? SEMI!
+	:	asrt:ASSERT^ expression ( c:COLON! expression )? SEMI!
+        {
+            ver.verifyWSAroundBegin(asrt.getLine(), asrt.getColumn(), asrt.getText());
+            if (c != null) {
+                ver.verifyWSAroundBegin(c.getLine(), c.getColumn(), c.getText());
+            }
+        }
 	;
 
 class GeneratedJava14Lexer extends GeneratedJavaLexer;

src/tests/com/puppycrawl/tools/checkstyle/CheckerTest.java

@@ -141,6 +141,9 @@ public class CheckerTest
             filepath + ":129: '.' is followed by whitespace.",
             filepath + ":136: '.' is preceeded with whitespace.",
             filepath + ":136: '.' is followed by whitespace.",
+            filepath + ":153: 'assert' is not followed by whitespace.",
+            filepath + ":156: ':' is not preceeded with whitespace.",
+            filepath + ":156: ':' is not followed by whitespace.",
         };
         verify(c, filepath, expected);
     }
@@ -202,6 +205,9 @@ public class CheckerTest
             filepath + ":129: '.' is followed by whitespace.",
             filepath + ":136: '.' is preceeded with whitespace.",
             filepath + ":136: '.' is followed by whitespace.",
+            filepath + ":153: 'assert' is not followed by whitespace.",
+            filepath + ":156: ':' is not preceeded with whitespace.",
+            filepath + ":156: ':' is not followed by whitespace.",
         };
         verify(c, filepath, expected);
     }

src/tests/com/puppycrawl/tools/checkstyle/InputWhitespace.java

@@ -149,12 +149,10 @@ class InputWhitespace
         // evil colons, should be OK
         assert "OK".equals(null) ? false : true : "Whups";
 
-        // WS tests for assert not implemented yet
-
         // missing WS around assert
-        // assert(true);
+        assert(true);
 
         // missing WS around colon
-        // assert true:"Whups";
+        assert true:"Whups";
     }
 }