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objective-cunit-testingocunit

Doing a compare of NSArray in ocUnit

I'm new to ocUnit and I'm attempting to compare 2 arrays with the STAssertTrue method and == for equality.

The test below simply asks the system under test (sut) for the array in return

- (void) testParse {
  SomeClassForTesting* sut = [[SomeClassForTesting alloc] init];
  NSArray* result = [sut parseAndReturn];

  NSArray* expected = [[NSArray alloc] initWithObjects:@"1", @"2", @"3", @"4",nil];

  STAssertTrue(result == expected, @"This test failed");
}

Then inside my production code I simply return the same array

- (NSArray *)parseAndReturn
{
  NSArray* x = [[NSArray alloc] initWithObjects:@"1", @"2", @"3", @"4",nil];
  return x;
}

Yet when the test runs I get a failure. How should I compare these objects to see if they are the same or not?

Thank you in advance

Solution

  • You probably want something like:

    STAssertTrue([result isEqual: expected], @"This test failed");

    This will go through the arrays and return false if each item does not return true from its isEqual implementations. If your array members are NSStrings as is indicated, you should be good to go.

    As the other fellow said, in Objective-C, == implies pointer equality and not value equivalence.