final类中的Powermock静态final方法

Question

我为之编写的测试用例：

public class AClassUnderTest {

    // This test class has a method call
    public Long methodUnderTest() {

         // Uses the FinalUtilityClass which contains static final method
         FinalUtilityClass.myStaticFinalMethod(<3-parameters-here>);

         // I want to mock above call so that test case for my "methodUnderTest" passes
    }
}

我还有最后一节课。

public final class FinalUtilityClass {

   /**
    * Method has 3 parameters
    */
   public static final MyBean myStaticFinalMethod(<3-parameters-here>) {

   }
}

我已经在测试类中添加了以下代码：

@RunWith(PowerMockRunner.class)
@PrepareForTest({ FinalUtilityClass.class })

PowerMockito.mock(FinalUtilityClass.class)
PowerMockito.when(FinalUtilityClass.myStaticFinalMethod(<3-parameters-here>).thenReturn(new MyBean());

PowerMockito.mockStatic(FinalUtilityClass.class)
PowerMockito.when(FinalUtilityClass.myStaticFinalMethod(<3-parameters-here>).thenReturn(new MyBean());

PowerMockito.spy(FinalUtilityClass.class)
PowerMockito.when(FinalUtilityClass.myStaticFinalMethod(<3-parameters-here>).thenReturn(new MyBean());

但对我来说什么都不起作用。请建议在final类中模仿static final方法的正确方法。

Answer 1

模拟对静态方法的调用需要执行以下步骤：

• 在测试用例的类级别使用@runwith(powermockrunner.class)注释。
• 在测试用例的类级别使用@preparefortest(classthatcontainsstaticmethod.class)注释
• 使用PowerMock.mockStatic（ClassThatContainsStaticMethod.class)模拟该类的所有方法

当您按照文档中的步骤执行这些步骤时，您的测试应该可以工作了。正如OP似乎对PowerMock和PowerMockito感到困惑--这（或多或少）是同样的事情：

package ghostcat.test;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.powermock.api.mockito.PowerMockito;
import org.powermock.core.classloader.annotations.PrepareForTest;
import org.powermock.modules.junit4.PowerMockRunner;

final class ClassWithStatic {
    public final static int ignoreMethodCall(String a, String b, int c) {
        System.out.println("SHOULD NOT SHOW UP: " + a);
        return c;
    }
}

@RunWith(PowerMockRunner.class)
@PrepareForTest(ClassWithStatic.class)
public class MockStaticTest {
    @Test
    public void test() {
        PowerMockito.mockStatic(ClassWithStatic.class);
        PowerMockito.when(ClassWithStatic.ignoreMethodCall("a", "b", 5)).thenReturn(42);
        org.junit.Assert.assertEquals(ClassWithStatic.ignoreMethodCall("a", "b", 5), 42);
    }
}