STAssertEquals reports equal strings as being different

I was trying to write a unit test for a library. A method from library returns string and I wanted to make sure it returns right string. But somewhat STAssertEquals macro in SenTestKit saw it as different value even though it was same.

You can see that description part clearly showed that two string values are same, yet this macro complained their values are different. When I return static string from method ( just like return @"op_user") it passed the test case. Anyone have an idea what cause to fail this test with same string value?

I think you want to use STAssertEqualObjects() instead of STAssertEquals(). The former is for Objective-C instances, the latter for primitive types.

From the docs:

STAssertEqualObjects

Fails the test case when two objects are different.

STAssertEquals

Fails the test case when two values are different.

If you compare Objective-C objects with STAssertEquals(), you're just comparing their pointer values. They could point to two different string objects that contain the same string. You would want them to compare as equal, even if their pointer values are different.

To compare the actual string contents, you'd use the isEqual: method, which is exactly what STAssertEqualObjects() does.