@Test
 public void testParameterizedParameterValue() {
   final FormValidation validation = testValidator.validateParameterValue("${VALUE}");
   assertEquals(
       "Warning if parameterized parameter value", FormValidation.Kind.WARNING, validation.kind);
 }
 @Test
 public void testValidParameterValue() {
   final FormValidation validation = testValidator.validateParameterValue("value");
   assertEquals(
       "Valid parameter value starts with a letter char", FormValidation.Kind.OK, validation.kind);
 }
 @Test
 public void testNullParameterValue() {
   final FormValidation validation = testValidator.validateParameterValue(null);
   assertEquals("Error if empty parameter value", FormValidation.Kind.ERROR, validation.kind);
 }