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    <p>This answer has been updated to the now released version 1.0 of Rx.</p> <p>Official documentation is still scant but <a href="http://msdn.microsoft.com/en-us/library/hh242967%28v=vs.103%29.aspx">Testing and Debugging Observable Sequences</a> on MSDN is a good starting place.</p> <p>The test class should derive from <a href="http://msdn.microsoft.com/en-us/library/microsoft.reactive.testing.reactivetest%28v=VS.103%29.aspx"><code>ReactiveTest</code></a> in the <code>Microsoft.Reactive.Testing</code> namespace. The test is based around a <a href="http://msdn.microsoft.com/en-us/library/microsoft.reactive.testing.testscheduler%28v=VS.103%29.aspx"><code>TestScheduler</code></a> that provides virtual time for the test.</p> <p>The <code>TestScheduler.Schedule</code> method can be used to queue up activities at certain points (ticks) in virtual time. The test is executed by <code>TestScheduler.Start</code>. This will return an <code>ITestableObserver&lt;T&gt;</code> that can be used for asserting for instance by using the <code>ReactiveAssert</code> class.</p> <pre><code>public class Fixture : ReactiveTest { public void SomethingHappenedTest() { // Arrange var scheduler = new TestScheduler(); var classUnderTest = new ClassUnderTest(); // Act scheduler.Schedule(TimeSpan.FromTicks(20), () =&gt; classUnderTest.DoSomething()); var actual = scheduler.Start( () =&gt; classUnderTest.SomethingHappened, created: 0, subscribed: 10, disposed: 100 ); // Assert var expected = new[] { OnNext(20, new Unit()) }; ReactiveAssert.AreElementsEqual(expected, actual.Messages); } } </code></pre> <p><code>TestScheduler.Schedule</code> is used to schedule a call to <code>DoSomething</code> at time 20 (measured in ticks).</p> <p>Then <code>TestScheduler.Start</code> is used to perform the actual test on the observable <code>SomethingHappened</code>. The lifetime of the subscription is controlled by the arguments to the call (again measured in ticks).</p> <p>Finally <code>ReactiveAssert.AreElementsEqual</code> is used to verify that <code>OnNext</code> was called at time 20 as expected.</p> <p>The test verifies that calling <code>DoSomething</code> immediately fires the observable <code>SomethingHappened</code>.</p>
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