Java 电源模拟单元测试具有 Thread.Sleep 的方法

Question

我正在尝试对调用 Thread.sleep 的方法进行单元测试。public Boolean waitForUpscale(){   String res = someObject.upTheResources();   Thread.sleep(20000);   Boolean status = someObject.checkForStatus();   return status;}在测试这个时，测试也会休眠，因为Thread.sleep我必须在测试时避免测试休眠。更新：我添加了这个测试：@Test    public void downscaleTest() throws Exception {        when(someservice.downScaleResources()).thenReturn("DONE");        PowerMockito.mockStatic(Thread.class);        doNothing().when(Thread.class, "sleep", anyLong());        Boolean res = Whitebox.invokeMethod(myController, "downscaleALL");        assertTrue(res);    }当我调试它时它有效。但是当我正常运行测试时，它失败并给出以下异常：0 matchers expected, 1 recorded:-> at com.mypackage.controller.MyController.downscaleALL(MyControllerTest.java:265)This exception may occur if matchers are combined with raw values:    //incorrect:    someMethod(anyObject(), "raw String");When using matchers, all arguments have to be provided by matchers.For example:    //correct:    someMethod(anyObject(), eq("String by matcher"));For more info see javadoc for Matchers class.添加 downScaleAll 方法private Boolean downscaleALL() {    try {        String downScaleResources = someservice.downScaleResources();        if (downScaleResources.equals("DONE")) {            Thread.sleep(20000); // 20s            log.info("DOWNSCALING THE RESOURCES NOW");            return true;        }        return false;    } catch (Exception e) {        log.error("Error while downscaling the resources");        log.error(e.toString());        return false;    }}

Answer 1

您应该只模拟您拥有的类型，因此，如果您想模拟对 的调用Thread.sleep()，您应该将其提取到您拥有的类型（例如ThreadSleeper）中，因此可以模拟。更好的是，如果可以的话，重写以避免睡眠。睡眠通常是一种代码气味（偷工减料）。

Answer 2

你不应该嘲笑你不拥有的类型。但如果你还必须这样做，你可以这样做

@RunWith(PowerMockRunner.class)

@PrepareForTest({<ClassWherewaitForUpscaleFunctionisLocated>.class, Thread.class})

public class Mytest {

    @Test

    public void testStaticVoid() throws Exception {

        PowerMockito.mockStatic(Thread.class);

        doNothing().when(Thread.class, "sleep", anyLong());

        .........

    }

}