public async Task InvokeAsync_Succeeds_DoesntInvokeFallback()
{
const string value = "value";
var command = new SuccessfulEchoCommandWithFallback(value);
var result = await command.InvokeAsync();
Assert.Equal(value, result);
Assert.False(command.FallbackCalled);
}
public async Task InvokeAsync_SuccessAndFallbackImplemented()
{
var mockStats = new Mock <IStats>();
var command = new SuccessfulEchoCommandWithFallback("foo")
{
Stats = mockStats.Object,
};
await command.InvokeAsync();
mockStats.Verify(m => m.Elapsed(It.IsRegex(".*fallback.*"), It.IsAny <string>(), It.IsAny <TimeSpan>()), Times.Never);
}
public async Task InvokeAsync_ThreadPoolRejects_InvokesFallback()
{
var exception = new IsolationThreadPoolRejectedException();
var pool = new RejectingIsolationThreadPool(exception);
var command = new SuccessfulEchoCommandWithFallback(new { })
{
ThreadPool = pool,
};
await command.InvokeAsync(); // Won't throw because there's a successful fallback.
Assert.True(command.FallbackCalled);
}
public async Task InvokeAsync_WhenBreakerRejectedButFallbackDefined_InvokesFallback()
{
var expected = new { };
var mockBreaker = new Mock <ICircuitBreaker>();
mockBreaker.Setup(m => m.IsAllowing()).Returns(false);
var command = new SuccessfulEchoCommandWithFallback(expected)
{
CircuitBreaker = mockBreaker.Object,
};
var result = await command.InvokeAsync();
Assert.True(command.FallbackCalled);
Assert.Equal(expected, result);
}