public async Task RunActivity_DoesntStartNewValidationIfExistingIsRunning() { var data = CreatePushData("test", "test"); var instanceId = CreateInstanceId(data); _mockDurableClient.CreateCheckStatusResponse(Arg.Any <HttpRequestMessage>(), instanceId).Returns(new HttpResponseMessage { StatusCode = HttpStatusCode.OK, Content = new StringContent(string.Empty) }); var status = new DurableOrchestrationStatus { RuntimeStatus = OrchestrationRuntimeStatus.Running }; _mockDurableClient.GetStatusAsync(instanceId).Returns(Task.FromResult(status)); var request = new HttpRequestMessage() { Content = new StringContent(JsonConvert.SerializeObject(data), System.Text.Encoding.UTF8, "application/json"), }; var result = await RepositoryValidatorEndpoint.RepositoryValidatorTrigger(request, _mockDurableClient, Substitute.For <ILogger>()); Assert.AreEqual(result.StatusCode, HttpStatusCode.OK); await _mockDurableClient.DidNotReceiveWithAnyArgs().StartNewAsync(Arg.Any <string>(), Arg.Any <string>(), Arg.Any <object>()); }