如何監視使用 Callable 實例化的對象<T> arg 並使用 Mockito 實現 Closeable？

Question

我試圖弄清楚如何通過使用 Mockito 並監視對象來跳過單元測試中的非靜態 void 方法調用。

有問題的課程是：

public class CallableExecutor<T> implements Closeable {

  public CallableExecutor( String s, Callable<T> c ) {
     this.s = s;
     this.c = c;
  }

  public void methodWeAreTryingToSkip( String string ) {
     // some logic
  }

}

我試圖單元測試的方法是：

public String myMethodThatIsBeingUnitTested( args ) {
   AtomicReference<String> id = new AtomicReference<>();
   try ( CallableExecutor<String> executor = new CallableExecutor<>(
      someString, () -> { id.set( someMethodCall ) );
      return id.get();
    } ) ) {
      executor.methodWeAreTryingToSkip( string );
    }
    catch ( Exception e ) {
      // exception handling
    }
}

在我的單元測試中，我嘗試了下面列出的代碼，但最終都在“doNothing()”行之前拋出了 Mockito 錯誤（底部有詳細的錯誤）：

CallableExecutor<String> mockExecutor = spy( new CallableExecutor<>( any(), any() ) );
doNothing().when( mockExecutor ).methodWeAreTryingToSkip( anyString() );

Callable callable = mock( Callable.class );
CallableExecutor<String> mockExecutor = spy( new CallableExecutor<>( anyString(), eq( callable ) ) );
doNothing().when( mockExecutor ).methodWeAreTryingToSkip( anyString() );

錯誤：

Misplaced or misused argument matcher detected here
You cannot use argument matchers outside of verification or stubbing.
Examples of correct usage of argument matchers:
    when(mock.get(anyInt())).thenReturn(null);
    doThrow(new RuntimeException()).when(mock).someVoidMethod(any());
    verify(mock).someMethod(contains("foo"))

This message may appear after an NullPointerException if the last matcher is returning an object 
like any() but the stubbed method signature expect a primitive argument, in this case,
use primitive alternatives.
    when(mock.get(any())); // bad use, will raise NPE
    when(mock.get(anyInt())); // correct usage use

Also, this error might show up because you use argument matchers with methods that cannot be mocked.
Following methods *cannot* be stubbed/verified: final/private/equals()/hashCode().
Mocking methods declared on non-public parent classes is not supported.

org.mockito.exceptions.misusing.InvalidUseOfMatchersException: 

You cannot use argument matchers outside of verification or stubbing.
Examples of correct usage of argument matchers:
    when(mock.get(anyInt())).thenReturn(null);
    doThrow(new RuntimeException()).when(mock).someVoidMethod(any());
    verify(mock).someMethod(contains("foo"))

This message may appear after an NullPointerException if the last matcher is returning an object 
like any() but the stubbed method signature expect a primitive argument, in this case,
use primitive alternatives.
    when(mock.get(any())); // bad use, will raise NPE
    when(mock.get(anyInt())); // correct usage use

Also, this error might show up because you use argument matchers with methods that cannot be mocked.
Following methods *cannot* be stubbed/verified: final/private/equals()/hashCode().
Mocking methods declared on non-public parent classes is not supported.

任何幫助或建議將不勝感激！

Answer 1

你寫了

spy( new CallableExecutor<>( any(), any() ) );

你不能這樣做。 您需要先創建一個實際的CallableExecutor對象，然后才能對其進行監視。 這意味着將實際值傳遞給它的構造函數，而不是傳遞匹配器方法的輸出。

匹配器方法通過操縱 Mockito 用來存儲存根和驗證信息的內部結構來工作。 這就是為什么您只能在存根或驗證期間使用它們。

將實際的非匹配器參數傳遞給CallableExecutor構造函數。