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    <p>What you want to look at is the "Swap" functionality of Isolator.</p> <pre><code>// First set up your fake Xyz. var fakeXyz = Isolate.Fake.Instance&lt;Xyz&gt;(); Isolate.WhenCalled(() =&gt; fakeXyz.SomeMethod()).WillReturn("Value"); // Now tell Isolator that the next time someone does // "new Xyz()" you want it to be your fake. Isolate.Swap.NextInstance&lt;Xyz&gt;().With(fakeXyz); // Create your Abc and do your assertions. This should pass: var realAbc = new Abc(); Assert.AreEqual("Value", realAbc.Context.SomeMethod(); </code></pre> <p>A good reference for figuring out this sort of basic Isolator functionality is <a href="http://docs.typemock.com/Isolator/##typemock.chm/Documentation/Welcome.htm" rel="nofollow">the online documentation on the Typemock site</a>. Check out the "Quick Start" and the "Using Typemock Isolator" sections. There are plenty more examples to show you how to do similar and more advanced things.</p> <p><strong>UPDATE:</strong> I previously showed <code>Assert.AreSame(fakeXyz, realAbc.Context)</code> as the way to verify the swap took place. It appears that in some versions of Typemock the <code>Assert.AreSame</code> will fail because there is some sort of dynamic proxy mechanism at work - they aren't actually swapping in for <em>literally the same instance</em> of the fake, they're doing some trickery to get things to happen. However, the calls on the fake instance will still be called and you'll still get the expected result. I've updated the sample snippet accordingly.</p>
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    1. COIs there a simpler syntax? For example in MOQ you would define a simple one liner... fakeXyz.SetupGet(x => x.Context).Returns(() => m_context);
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    2. COThat's what the second line in the setup is - the `Isolate.WhenCalled` is the equivalent of the `SetupGet` you're talking about. `Isolate.Fake.Instance` is the equivalent of `var mock = new Mock<T>()` in Moq. The `Isolate.Swap.NextInstance` has no equivalent in Moq because Moq doesn't use the profiler API so can't swap out calls to `new` the way Isolator can.
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