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    <p>The exact order of When..Do and Arg.Do isn't defined, and I wouldn't recommend counting on it as I imagine it could change between versions depending on implementation. (If you have a good reason to define it in a particular order please post your suggestion to the <a href="http://groups.google.com/group/nsubstitute" rel="nofollow">usergroup</a>.) </p> <p>If you just want to check logThing received the expected LogEntry, you can check the argument after the fact using Arg.Is():</p> <pre><code>logThing.Received().AddEntry(Arg.Is(expectedEntry)); </code></pre> <p>If you need more complex comparison logic, you can do the same thing but use a method to check the argument:</p> <pre><code>logThing.Received().AddEntry(Arg.Is&lt;LogEntry&gt;(x =&gt; CheckLogEntry(x))); </code></pre> <p><code>CheckLogEntry</code> can do whatever checks you require, and you can keep the When..Do throwing as before.</p> <p>If you need to use the When..Do approach, you can can keep your existing approach but move the capture of the argument into the <code>Do</code> call to ensure the order of calls that you expect:</p> <pre><code>logThing.When( lt =&gt; lt.AddEntry(Arg.Any&lt;LogEntry&gt;())).Do( call =&gt; { actualEntries.Add(call.Arg&lt;LogEntry&gt;()); throw new InvalidOperationException("testMessage"); }); </code></pre> <p>In terms of suggestions for other ways of testing this, I'm not entirely clear on what you are trying to do here, but if you are having trouble isolating where the wrapped output is coming from maybe you could move this responsibility to another dependency? This would let you substitute for this dependency and control exactly where this happened from the perspective of this test.</p>
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    1. USDavid Tchepak
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    1. COThanks for the clarification on the ordering (or lack of). I don't have any solid reasons for wanting it this way, just that I expected it to happen 'before' the function the arguments are used for. Originally, I had logThing.Received().AddEntry(Arg.Do<LogEntry>(x => CheckLogEntry(x))); but that didn't ever trigger. I hadn't actually thought about using .Is, but I'll do that with it returning a bool after the checks, I think that's the neatest way.
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    2. COYes, Arg.Do won't trigger in a Received(), as Received() is checking calls after the fact. Arg.Do only fires for future calls that are received.
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      1. USDavid Tchepak
    3. CODo you know if there is a way to prevent .Is() from swallowing exceptions? It makes reading the assert from the error message basically impossible, as the currently thrown error from Is only says the complex object does not match, it doesn't specify where or how.
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