/// <summary>Example test class using xUnit.</summary>
[Collection("Tracing Test Collection")]
// xUnit collections allow running test classes synchronously. This is important for
// testing Trace, since it's static and we don't want tests to interfere with one another.
public sealed TestClass
{
    [Fact]
    public void Test()
    {
        var expectedTraceMessages = new List<string>
        {
            "This is the first trace message...",
            "And, this is the second trace message!"
        };
        var actualTraceMessages = new List<string>();
        Trace.Listeners.Add(new UnitTestingTraceListener
        {
            OnWriteLine = (actualTraceMessage) =>
                actualTraceMessages.Add(actualTraceMessage)
        });

        // Invoke item being tested that logs to Trace here...
        var sut = new TestClass();
        sut.SendRequest();

        // Verify each message was logged in the expected order
        Assert.Equal(expectedTraceMessages.Count, actualTraceMessages.Count);
        for (int i = 0; i < expectedTraceMessages.Count; i++)
        {
            Assert.Equal(expectedTraceMessages[i], actualTraceMessages[i]);
        }
    }
}