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POHow can I unit-test init methods in Objective-C?
 

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    <p>I'm unit testing a Mac App in Xcode 5 using the new XCTest framework. Specifically, I'm trying to test that a class implements an (as yet unwritten!) <code>- (id)initWithStream:(NSInputStream)stream</code> method. So I have the start of my test:</p> <pre><code>- (void)testInitWithStream { // Should have an init method named initWithStream: XCTAssertTrue([[MYParser alloc] respondsToSelector:@selector(initWithStream:)], @"'initWithStream:' not implemented."); </code></pre> <p>Which works fine; the test currently fails as expected. It's the next part, which attempts to run the as-yet-unwritten method, that's causing me grief:</p> <pre><code> // Should return nil if no valid stream is passed XCTAssertNil([[MYParser alloc] performSelector:@selector(initWithStream:) withObject:nil], @"should get nil on 'initWithStream:' with no stream."); </code></pre> <p>Xcode gives me the error "PerformSelector names a selector which retains the object." I'm using <code>performSelector:withObject:</code> because attempting to call the selector directly results in an error that "No visible @interface for 'MYParser' declares the selector 'initWithStream:'."</p> <p>My test suite has <code>GCC_WARN_UNDECLARED_SELECTOR</code> turned off, but these are errors, not warnings. How can I test the init methods of objects when the test needs to cover the situation where the method may not be implemented (even as a definition) yet?</p> <p>The method may not be implemented yet because I'm writing my tests first; is this right, or should I be writing my class definitions first, then my tests, then the actual implementation? (I'm looking for consensus and best-practice on this point, not just opinion.)</p>
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