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POHow do I mock a method with an open array parameter in PascalMock?
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  1. POHow do I mock a method with an open array parameter in PascalMock?
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    copied!<p>I'm currently in the process of getting started with unit testing and mocking for good and I stumbled over the following method that I can't seem to fabricate a working mock implementation for:</p> <pre><code>function GetInstance(const AIID: TGUID; out AInstance; const AArgs: array of const; const AContextID: TImplContextID = CID_DEFAULT): Boolean; </code></pre> <p><em>(<code>TImplContextID</code> is just a type alias for Integer)</em></p> <p>This is how far I got:</p> <pre><code>function TImplementationProviderMock.GetInstance( const AIID: TGUID; out AInstance; const AArgs: array of const; const AContextID: TImplContextID): Boolean; var lCall: TMockMethod; begin lCall := AddCall('GetInstance').WithParams([@AIID, AContextID]); Pointer(AInstance) := FindVarData(lCall.OutParams[0]).VPointer; Result := lCall.ReturnValue; end; </code></pre> <p>But I haven't been able to figure out how I am supposed to mock the open array parameter <code>AArgs</code>. Any ideas?</p> <p>Also, is there maybe a simpler way to to return the <code>out</code>-parameter <code>AInstance</code> and is using the <code>@</code>-notation for the <code>TGUID</code>-typed parameter (essentially a record, i.e. a value type) the right way to go?</p> <p>Is it possible to mock this method with the current version of PascalMock at all?</p> <hr> <p><strong>Update 2:</strong> I have now cut down the question text for clarity. Originally it contained the following erroneous implementation of the mock method which was what Mason's reply refers to:</p> <pre><code>function TImplementationProviderMock.GetInstance( const AIID: TGUID; out AInstance; const AArgs: array of const; const AContextID: TImplContextID): Boolean; begin Result := AddCall('GetInstance') .WithParams([@AIID, AContextID]) .ReturnsOutParams([AInstance]) .ReturnValue; end; </code></pre> <p>In this the compiler complained about the <code>.ReturnsOutParams([AInstance])</code> saying "Bad argument type in variable type array constructor.".</p>
 

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