CODEWITHSUNDEEP
objective-cunit-testingocmock
Sandro Meier
Sandro Meier

Reputation: 3051

OCMock does not recognize called selector

I'm struggling with a testcase that uses OCMock. So far I used OCMock in a few projects and it always work as i thought. I have the following method that tests that [self setNeedsDisplay] is called when I set a property called image. 

- (void)testSetTapColorCallsDrawRect 
{
    SMColorButton *button = [[SMColorButton alloc] initWithImage:nil];
    id mock = [OCMockObject partialMockForObject:button];

    // Exptect setNeedsDisplay. 
    [[mock expect] setImage:OCMOCK_ANY];
    [[mock expect] setNeedsDisplay];

    button.image = [UIImage imageNamed:@"Button.png"];

    [mock verify];
}

And the setter for the image property looks like this.

- (void)setImage:(UIImage *)anImage
{
    // Set the image if it changed.
    if (anImage != image) {
        image = anImage;
        [self setNeedsDisplay];
    }
}

You can see [self setNeedsDisplay] is called in the setter. But when I run the tests I get the following error:

OCPartialMockObject[SMColorButton]: expected method was not invoked: setNeedsDisplay

It looks as if the method was not called. But if I set a breakpoint the the setter method, it stops and shows me that the line was executed by the application.

Can you help me out? I don't see what I'm doing wrong...

Upvotes: 0

Views: 1122

Answers (1)

Christopher Pickslay
Christopher Pickslay

Reputation: 17762

The problem is that you're mocking the method you're testing, setImage:. That expectation intercepts the call, so it never follows the code path in the class under test. Try changing your test to:

- (void)testSetTapColorCallsDrawRect 
{
    SMColorButton *button = [[SMColorButton alloc] initWithImage:nil];
    id mock = [OCMockObject partialMockForObject:button];    
    [[mock expect] setNeedsDisplay];

    button.image = [UIImage imageNamed:@"Button.png"];

    [mock verify];
}

Upvotes: 2

Related Questions