如何为 Azure Function TimerTrigger 实现单元测试

Question

有人可以帮助如何使用 JUnit/Mockito 为以下代码编写单元测试吗？

    @FunctionName("nodeStats")
    public void nodeStats(@TimerTrigger(name = "nodeStatsTrigger", schedule = "0 */5 * * * *", dataType = "string") String timerInfo,
                          final ExecutionContext context) {
        getNodeStats();
    }

Answer 1

以下文档可能会有所帮助：

https://code.visualstudio.com/docs/java/java-testing

https://docs.microsoft.com/en-us/azure/azure-functions/functions-add-output-binding-storage-queue-java#update-the-tests

创建 Java 函数应用程序时，会自动为 HTTP 触发函数创建示例测试用例：

    @Test
public void testHttpTriggerJava() throws Exception {
    // Setup
    @SuppressWarnings("unchecked")
    final HttpRequestMessage<Optional<String>> req = mock(HttpRequestMessage.class);

    final Map<String, String> queryParams = new HashMap<>();
    queryParams.put("name", "Azure");
    doReturn(queryParams).when(req).getQueryParameters();

    final Optional<String> queryBody = Optional.empty();
    doReturn(queryBody).when(req).getBody();

    doAnswer(new Answer<HttpResponseMessage.Builder>() {
        @Override
        public HttpResponseMessage.Builder answer(InvocationOnMock invocation) {
            HttpStatus status = (HttpStatus) invocation.getArguments()[0];
            return new HttpResponseMessageMock.HttpResponseMessageBuilderMock().status(status);
        }
    }).when(req).createResponseBuilder(any(HttpStatus.class));

    final ExecutionContext context = mock(ExecutionContext.class);
    doReturn(Logger.getGlobal()).when(context).getLogger();

    // Invoke
    final HttpResponseMessage ret = new Function().run(req, context);

    // Verify
    assertEquals(ret.getStatus(), HttpStatus.OK);
}