Github user tillrohrmann commented on a diff in the pull request: https://github.com/apache/flink/pull/6222#discussion_r199170668 --- Diff: flink-runtime/src/test/java/org/apache/flink/runtime/rest/handler/job/JobSubmitHandlerTest.java --- @@ -87,4 +89,33 @@ public void testSuccessfulJobSubmission() throws Exception { handler.handleRequest(new HandlerRequest<>(request, EmptyMessageParameters.getInstance()), mockGateway) .get(); } + + @Test + public void testFailedJobSubmission() throws Exception { + final String errorMessage = "test"; + DispatcherGateway mockGateway = mock(DispatcherGateway.class); + when(mockGateway.submitJob(any(JobGraph.class), any(Time.class))).thenReturn(FutureUtils.completedExceptionally(new Exception(errorMessage))); + GatewayRetriever<DispatcherGateway> mockGatewayRetriever = mock(GatewayRetriever.class); --- End diff -- No need to create a mock. `() -> CompletableFuture.completed(mockGateway)` should be good enough.
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