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POHow can I get OCMock under ARC to stop nilling an NSProxy subclass set using a weak property?
 

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  1. POHow can I get OCMock under ARC to stop nilling an NSProxy subclass set using a weak property?
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    <p>Under <code>ARC</code>, I have an object, <code>Child</code> that has a <code>weak</code> property, <code>parent</code>. I'm trying to write some tests for <code>Child</code>, and I'm mocking its <code>parent</code> property using <code>OCMock</code>.</p> <p>Under ARC, setting an <code>NSProxy</code> subclass using a synthesized weak property setter doesn't set the property ... the line after the weak property is set, checking it reveals that it's already <code>nil</code>. Here's the concrete example:</p> <pre><code>@interface Child : NSObject @property (nonatomic, weak) id &lt;ParentInterface&gt;parent; @end @implementation Child @synthesize parent = parent_; @end // ... later, inside a test class ... - (void)testParentExists { // `mockForProtocol` returns an `NSProxy` subclass // OCMockObject *aParent = [OCMockObject mockForProtocol:@protocol(ParentInterface)]; assertThat(aParent, notNilValue()); // `Child` is the class under test // Child *child = [[Child alloc] init]; assertThat(child, notNilValue()); assertThat(child.parent, nilValue()); child.parent = (id&lt;ParentInterface&gt;)aParent; assertThat([child parent], notNilValue()); // &lt;-- This assertion fails [aParent self]; // &lt;-- Added this reference just to ensure `aParent` was valid until the end of the test. } </code></pre> <p>I know that I can get around this using an <code>assign</code> property instead of a <code>weak</code> property for the <code>Child</code> to reference the <code>Parent</code>, but then I'd have to <code>nil</code> out the <code>parent</code> when I was done with it (like some sort of caveman), which is exactly the sort of thing that ARC was supposed to obviate.</p> <p>Any suggestions on how to make this test pass without changing my app code?</p> <p><strong>Edit</strong>: It seems to have to do with <code>OCMockObject</code> being an <code>NSProxy</code>, if I make <code>aParent</code> be an instance of <code>NSObject</code>, the <code>child.parent</code> weak reference "holds" a non-nil value. Still looking for a way to make this test pass without changing app code.</p> <p><strong>Edit 2</strong>: After accepting Blake's answer, I did an implementation in my project of a preprocessor macro that conditionally changed my properties from weak -> assign. Your mileage may vary:</p> <pre><code>#if __has_feature(objc_arc) #define BBE_WEAK_PROPERTY(type, name) @property (weak, nonatomic) type name #else #define BBE_WEAK_PROPERTY(type, name) @property (assign, nonatomic) type name #endif </code></pre>
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    1. COCheck out this commit message: https://github.com/erikdoe/ocmock/commit/dbdb233ae84498077f7e946abb49731968333f0b Looks like the OCMock team is looking into the same thing.
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