如何在工厂类中模拟静态方法

Question

public class ABCFactory extends BaseUserFactory
{
    private static final ABCFactory factory = new ABCFactory();

    public static final ABCFactory getFactory()
    {
        return factory;
    }

    public Context getContext(String authority)
    {
        return (Context)createInstance(authority);
    }

    private ABCFactory()
    {
    }

    protected Class getInterface()
    {
        return ABCFactory.class;
    }
}

Profile profile = ABCFactory.getFactory().getContext(authority).currentProfile();

ABCFactory mockABCFactory = Mockito.mock(ABCFactory.class);
ServiceProviderRegistrar.getRegistrar().bind(ABCFactory.class).toMockInstance(mockABCFactory);
Mockito.when(mockABCFactory .getFactory()).thenReturn(null);
Mockito.when(mockABCFactory .getContext(domain)).thenReturn(null);

错误：org.mockito.exceptions.misusing.missingMethodInvocationException：when（）需要一个参数，该参数必须是“mock上的方法调用”。例如：when（mock.getArticles（））.thenreturn（articles）；

此外，此错误可能会出现，因为：1。您可以存根：finall/private/equals()/hashcode（）方法中的任何一个。这些方法不能被截断/验证。2.在when（）中，您不是在mock上调用method，而是在其他对象上调用method。

尝试2：（使用PowerMock避免新的调用。documentTest.java

ABCFactory mockABCFactory = Mockito.mock(ABCFactory.class);
ServiceProviderRegistrar.getRegistrar().bind(ABCFactory.class).toMockInstance(mockABCFactory);
  try
  {
    PowerMockito.whenNew(ABCFactory.class).withNoArguments().thenReturn(mockABCFactory);
    PowerMockito.when(ABCFactory.getFactory()).thenReturn(mockABCFactory);
  }
  catch (Exception e)
  {
     e.printStackTrace();
  }
Mockito.when(mockABCFactory.getContext(domain)).thenReturn(null);

ABCFactory mockABCFactory= Mockito.mock(ABCFactory.class);
  ServiceProviderRegistrar.getRegistrar().bind(ABCFactory.class).toMockInstance(mockABCFactory);
 try
  {
    PowerMockito.whenNew(ABCFactory.class).withNoArguments().thenReturn(mockABCFactory);
    PowerMockito.mockStatic(ABCFactory.class);
    PowerMockito.when(ABCFactory.getFactory()).thenReturn(mockABCFactory);

  }
  catch (Exception e)
  {
     e.printStackTrace();
  }
  Mockito.when(mockABCFactory.getContext(domain)).thenReturn(null);

Answer 1

你是否使用了以下注释。

@RunWith(PowerMockRunner.class)
@PrepareForTest( ABCFactory.class )

我尝试了，下面的代码工作。

DocumentTest.class

@RunWith(PowerMockRunner.class)
@PrepareForTest( ABCFactory.class )
public class DocumentTest
{
  /** Unit under test. */
  private Document user;

  @Before public void setUp() {
     user = new Document();
     ABCFactory abc = ABCFactory.getFactory();
     PowerMockito.mockStatic(ABCFactory.class);
     PowerMockito.when(ABCFactory.getFactory()).thenReturn(abc);    
  }  

  @Test public void testABC() {
     assertEquals("", user.useFactory() );
  }
}

public class Document
{
 public String useFactory(){
   String profile = ABCFactory.getFactory().getContext("");
   return profile;
 }
}