XCTAssertEqual fails to compare two string values?

Question

I added a simple unit test to test my string extension. But it fails. What I am I doing wrong here?

From what I know XCTAssertEqual is testing value and

Answer 1

Comparing strings

- (void) testStringComparison {

    NSString *first = @"my string";
    NSString *second = @"my string";

    NSMutableString *firstMutable = [NSMutableString stringWithString:first];

    //== comparing addresses of the objects(pointer comparison)
    //`first` and `second` has the same address it is a compiler optimization to store only one copy
    XCTAssertTrue(first == second);
    XCTAssertFalse(first == firstMutable);

    XCTAssertEqual(first, second);
    XCTAssertNotEqual(first, firstMutable);
    XCTAssertEqualObjects(first, firstMutable);
    XCTAssertTrue([first isEqualToString:firstMutable]);
}