[英]How can i make DateUtil throw an exception?
@Override
public void contextDestroyed(ServletContextEvent sce) {
try{
DateUtil.clean();
}catch(Exception e){
LOGGER.error("MyServletContextListener contextDestroyed error: ", e);
}
我正在對上面的代碼進行單元測試,並試圖通過點擊 Exception 子句來獲得 100% 的行覆蓋率,但是,我似乎無法讓它與我的實現一起工作。 將不勝感激任何幫助。 請在下面查看我的實現。
@Test (expected= Exception.class)
public void test_contextDestroyed_Exception() {
DateUtil wrapper = Mockito.spy(new DateUtil());
Exception e = mock(Exception.class);
when(wrapper).thenThrow(e);
Mockito.doThrow(e)
.when(myServletContextListener)
.contextDestroyed(sce);
myServletContextListener.contextDestroyed(sce);
}
由於DateUtil.clean()
是一個 static 方法,因此不能用 Mockito 模擬它。 您需要改用 PowerMockito:
<properties>
<powermock.version>1.6.6</powermock.version>
</properties>
<dependencies>
<dependency>
<groupId>org.powermock</groupId>
<artifactId>powermock-module-junit4</artifactId>
<version>${powermock.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.powermock</groupId>
<artifactId>powermock-api-mockito</artifactId>
<version>${powermock.version}</version>
<scope>test</scope>
</dependency>
</dependencies>
檢查官方 PowerMock 文檔以了解與 JUnit 和 Mockito 的版本兼容性。
一旦你這樣做了,你應該在你的測試 class 中添加以下內容:
@RunWith(PowerMockRunner.class) //<-- this says to JUnit to use power mock runner
@PrepareForTest(DateUtil.class) //<-- this prepares the static class for mock
public class YourTestClass {
@Test(expected = Exception.class)
public void test_contextDestroyed_Exception() {
PowerMockito.mockStatic(DateUtil.class);
when(DateUtil.clean()).thenThrow(new Exception("whatever you want"));
//prepare your test
//run your test:
myServletContextListener.contextDestroyed(sce);
}
}
您可以使用來自 Mockito 的mockito-inline
工件來測試 static 方法並遵循以下方法,
try (MockedStatic<DateUtil> utilities = Mockito.mockStatic(DateUtil.class)) {
utilities.when(DateUtil::clean).thenThrow(Exception.class);
// assert exception here
}
欲了解更多信息,
https://frontbackend.com/java/how-to-mock-static-methods-with-mockito
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