improve code coverage

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

@@ -0,0 +1,20 @@
+package com.puppycrawl.tools.checkstyle;
+
+import com.puppycrawl.tools.checkstyle.api.CheckstyleException;
+import junit.framework.TestCase;
+
+/**
+ * Test class for checker
+ * @author <a href="mailto:checkstyle@puppycrawl.com">Oliver Burn</a>
+ */
+public class CheckerTest
+    extends TestCase
+{
+    public void testPackageNames() throws CheckstyleException
+    {
+        final Checker c = new Checker();
+        final String[] pkgs = new String[0];
+        c.setPackageNames(pkgs);
+        assertEquals(pkgs, c.getPackageNames());
+    }
+}