@Test
 public void testValidTestFolder() {
   final FormValidation validation = testValidator.validateTestFolder("test");
   assertEquals("Valid test folder", FormValidation.Kind.OK, validation.kind);
 }
 @Test
 public void testNullTestFolder() {
   final FormValidation validation = testValidator.validateTestFolder(null);
   assertEquals("Error if test folder not defined", FormValidation.Kind.ERROR, validation.kind);
 }
 @Test
 public void testParameterizedTestFolder() {
   final FormValidation validation = testValidator.validateTestFolder("${FOLDER}");
   assertEquals(
       "Warning if parameterized test folder", FormValidation.Kind.WARNING, validation.kind);
 }
 // Validation of test folder
 @Test
 public void testEmptyTestFolder() {
   final FormValidation validation = testValidator.validateTestFolder("");
   assertEquals("Error if empty test folder", FormValidation.Kind.ERROR, validation.kind);
 }