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POFunction is called when I do not expect it to with NSubstitute
 

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  1. POFunction is called when I do not expect it to with NSubstitute
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    <p>I am getting a behaviour I didnt expect from NSubstitute when setting up my mocks to call a function. A simplified version of the behavuiour is</p> <pre class="lang-c# prettyprint-override"><code>[Test] public void NSubstituteTest() { var mockedFoo = Substitute.For&lt;IFoo&gt;(); mockedFoo.GenerateString(Arg.Any&lt;string&gt;()).Returns(x =&gt; GetValue(x.Args()[0])); mockedFoo.GenerateString("0").Returns("hi"); string result1 = mockedFoo.GenerateString("0"); string result2 = mockedFoo.GenerateString("1"); Assert.AreEqual("hi", result1); Assert.AreEqual("1", result2); } private string GetValue(object val) { string returnValue = val != null ? val.ToString() : "I am null"; System.Diagnostics.Trace.WriteLine(returnValue); return returnValue; } </code></pre> <p>The test passes but I get the output: 0 1</p> <p>This indicates that the call to mockedFoo.GenerateString("0"); actually results in a call to the GetValue() function.</p> <p>If I do the same with Moq:</p> <pre class="lang-c# prettyprint-override"><code>[Test] public void MoqTest() { var mockedFoo = new Mock&lt;IFoo&gt;(); mockedFoo.Setup(x =&gt; x.GenerateString(It.IsAny&lt;string&gt;())).Returns((object s) =&gt; GetValue(s)); mockedFoo.Setup(x =&gt; x.GenerateString("0")).Returns("hi"); string result1 = mockedFoo.Object.GenerateString("0"); string result2 = mockedFoo.Object.GenerateString("1"); Assert.AreEqual("hi", result1); Assert.AreEqual("1", result2); } </code></pre> <p>Then my tests also passes but I get the result: 1</p> <p>Indicating the function was not called.</p> <p>Is this behaviour described somewhere or do I set something up in a wrong way perhaps? </p>
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    1. USJon
    1. USJon
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      1. POFunction is called when I do not expect it to with NSubstitute
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    1. COFollowing on from my answer, if you are still happy to use NSubstitute and would like to discuss other ideas to work around this constraint please post to the [mailing list](http://groups.google.com/group/nsubstitute). (For example, we could look at extending the When..Do syntax to support Returns, which would give the option of deferred execution for cases like these where it is needed.)
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      1. POFunction is called when I do not expect it to with NSubstitute
      1. USDavid Tchepak
    2. COSounds great - I still feel the syntax of NSubstitute overweights this "issue" and I will keep using it
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      1. POFunction is called when I do not expect it to with NSubstitute
      1. USJon
 

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