public async Task GetNumberOfMessagesOnQueue_ShouldReturnNumberOfMessagesOnQueue_WhenMessageExists()
{
var client = new SQSClientMock("mockEndpoint", "mockRegion");
await client.CreateStandardFifoQueueAsync(FifoQueueName);
await client.SendMessageAsync("Foo", FifoQueueName);
var actual = await client.GetNumberOfMessagesOnQueue(FifoQueueName);
Assert.Equal(FifoQueueName, actual.QueueName);
Assert.Equal(1, actual.ApproximateNumberOfMessages);
}
