Testing a Spring Web Flow validator

MyModelValidatorTest.java

@Test
public void testValidateSomeEventId() { 
	
	// setup:		

	// mock request
	MockRequestContext requestContext = new MockRequestContext();
	// mock message context:
	MessageContext messages = requestContext.getMessageContext();	
	messages.clearMessages();
	
	// mock validation context:
	ValidationContext validationContext = new DefaultValidationContext(requestContext, "start", null);
	
	// the model passed to the validator
	MyModel myModel = new MyModel();
	// .. set values on your model as appropriate
	
	// item under test
	MyModelValidator myModelValidator = new MyModelValidator();		
	myModelValidator.validateSomeEventId(myModel, validationContext);
	
	// assertions
	assertEquals("Assert Validation passed", 0, messages.getAllMessages().length);
	
	
}