java - 使用 PowerMock 和 TestNG 模拟单个静态方法

Question

class StaticClass {
  public static String a(){ return "a"; }
  public static String ab(){ return a()+"b"; }
}

我想模拟 StaticClass::a 以便它返回 "x" 并且调用 StaticClass.ab() 结果“xb”...

我发现在 PowerMock 和 TestNG 中很难......

---

我现在正在测试的确切代码:

class StaticClass {
    public static String A() {
        System.out.println("Called A");
        throw new IllegalStateException("SHOULD BE MOCKED AWAY!");
    }

    public static String B() {
        System.out.println("Called B");
        return A() + "B";
    }
}

@PrepareForTest({StaticClass.class})
public class StaticClassTest extends PowerMockTestCase {

    @Test
    public void testAB() throws Exception {
        PowerMockito.spy(StaticClass.class);
        BDDMockito.given(StaticClass.A()).willReturn("A");
        assertEquals("AB", StaticClass.B()); // IllegalStateEx is still thrown :-/
    }

}

---

我有 Maven 依赖项:

<artifactId>powermock-module-testng</artifactId>
and
<artifactId>powermock-api-mockito</artifactId>

Answer 1

为什么不尝试这样的事情:

PowerMockito.mockStatic(StaticClass.class);
Mockito.when(StaticClass.a()).thenReturn("x");
Mockito.when(StaticClass.ab()).thenCallRealMethod();