Question

I am writing junit test for validators. Below code works:

// initialize errors
errors = createNiceMock(BindingResult.class);
errors.rejectValue("orgId", "mismatch.LaunchQueryForm.orgId");

// activate the mock
replay(errors);

// go ahead and run validate now
launchQueryValidator.validate(launchQueryForm, errors);

// verify the errors
verify(errors);

However below doesn’t work in junit – the difference here is that i am sending an additional parameter to display in the error message, Any idea how to write junit for this?

errors.rejectValue("typeInput", "mismatch.LaunchQueryForm.typeInput",
                           new Object[]
                { launchQueryForm.getTypeInput() }, null);

Error i get in this case is:

java.lang.AssertionError: 
  Expectation failure on verify:
    BindingResult.rejectValue("typeInput", "mismatch.LaunchQueryForm.typeInput", ["X"], null): expected: 1, actual: 0

Thanks in advance for looking into this.

Best,
Prasad

Answer 1

This problem indicates that it’s not a good idea to use mock in this case.

Use real BindingResult implementation and check its state instead:

BindingResult errors = 
    new BeanPropertyBindingResult(launchQueryForm, "LaunchQueryForm");

launchQueryValidator.validate(launchQueryForm, errors);

assertEquals("mismatch.LaunchQueryForm.orgId", 
    errors.getFieldError("orgId").getCode());