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[英]jdbcTemplate classCastException during Mockito.when thenReturn
[英]Method is not gettting mocked (Mockito.when().thenReturn()) and not returning specified mock value
我正在為受保護的方法編寫測試用例,該方法稱為
protected boolean printMultipleImages(int rows, int cols, IIOImage[] imgs,
PrintMode mode, AutomaticCroppingOption crop,
double reduction, int renderOption)
在此方法中,將初始化數組變量,下面的代碼顯示了如何
RenderRequest request = this.formSlotsRenderRequest(rows, cols, imgs,mode, crop, reduction);
// Create a Printer Properties Object...
PrinterProperties prop = this.getAutoPrinterProperties();
// Get the Appropriate Print Rendering Engine..
MultiFilmPrintRenderer engine = this.getPrintRenderer();
MultiFilmRenderRequest multiFilmRenderRequest = new MultiFilmRenderRequest(renderOption, request,new ChoppingPreferences());
assert engine != null;
RenderedImage[] rImageArr =engine.renderAcrossFilms(multiFilmRenderRequest, prop); //NPE here, rImageArr=null, though I mocked the method to return something.
在下面突出顯示的行中,變量rImageArr
尚未初始化並且為null,方法調用engine.renderAcrossFilms(multiFilmRenderRequest, prop);
給我null,即使我對其進行模擬以返回內容並且該控件進入該方法內部並給出Null Pointer Exception也不應該發生,因為我在模擬它。 此處使用的所有變量都是該方法的局部變量。
RenderedImage[] rImageArr =engine.renderAcrossFilms(multiFilmRenderRequest, prop);
這就是我嘲笑方法engine.renderAcrossFilms(multiFilmRenderRequest, prop);
@Test
public void testPrintMultipleImages() throws Exception
{
//MultiFilmRenderRequest req=Mockito.mock(MultiFilmRenderRequest.class);
MultiFilmPrintRenderer engine=Whitebox.getInternalState(autoPrintEndPoint, "_engine");//new JCPrintRenderEngine();//
System.out.println(engine+"here");
RenderedImage[] renderAcrossFilms=new RenderedImage[]{Mockito.mock(RenderedImage.class)};
PrinterProperties prop=Mockito.mock(PrinterProperties.class);
RenderRequest renderRequest=Mockito.mock(RenderRequest.class);
AutomaticCroppingOption crop=Mockito.mock(AutomaticCroppingOption.class);
PrintMode mode=Mockito.mock(PrintMode.class);
IIOImage img=Mockito.mock(IIOImage.class);
MultiFilmRenderRequest multiFilmRenderRequest = new MultiFilmRenderRequest(1, renderRequest,
new ChoppingPreferences());
PowerMockito.doNothing().when(autoPrintEndPoint,PowerMockito.method(AutoPrintEndPoint.class,"loadImage", IIOImage.class)).withArguments(img);
PowerMockito.doReturn(renderRequest).when(autoPrintEndPoint,PowerMockito.method(AutoPrintEndPoint.class,"formSlotsRenderRequest", int.class, int.class, IIOImage[].class,PrintMode.class,AutomaticCroppingOption.class,double.class)).withArguments(2,2,new IIOImage[]{img},mode,crop,12.5);
PowerMockito.doReturn(prop).when(autoPrintEndPoint,PowerMockito.method(AutoPrintEndPoint.class,"getAutoPrinterProperties")).withNoArguments();
Mockito.when(engine.renderAcrossFilms(Mockito.any(MultiFilmRenderRequest.class),Mockito.any(PrinterProperties.class))).thenReturn(renderAcrossFilms);
Method printMultipleImages=AutoPrintEndPoint.class.getDeclaredMethod("printMultipleImages", int.class,int.class,IIOImage[].class,PrintMode.class,AutomaticCroppingOption.class,double.class,int.class);
printMultipleImages.setAccessible(true);
printMultipleImages.invoke(autoPrintEndPoint,2,2,new IIOImage[]{img},mode,crop,12.5,1);
}
我希望我的問題很清楚,希望你能幫助我
在您要測試的方法中,它將創建新實例
MultiFilmRenderRequest multiFilmRenderRequest = new MultiFilmRenderRequest(renderOption, request,new ChoppingPreferences());
並將其用作模擬方法的參數。 但是您可能已經嘲笑了該方法提供的參數不等於printMultipleImages方法傳遞給引擎的參數。
除此之外,我可以看到PrinterProperties prop = Mockito.mock(PrinterProperties.class);
但是此模擬類尚未使用,因此目標測試方法可能還會發送另一個PrinterProperties對象。
您可以使用
engine.renderAcrossFilms(Mockito.any(MultiFilmRenderRequest.class),Mockito.any(PrinterProperties.class))
當您提供更多詳細信息時,我將繼續擴展此答案,但是根據最新更新,您將:
MultiFilmPrintRenderer engine =
Whitebox.getInternalState(autoPrintEndPoint, "_engine");
// ...
Mockito.when(engine.renderAcrossFilms(multiFilmRenderRequest, prop))
.thenReturn(renderAcrossFilms);
那么,這個Whitebox.getInternalState是否返回模擬對象?
我在用於調用要嘗試模擬的方法的engine
對象上創建了一個模擬,並執行了setInternalState。
MultiFilmPrintRenderer engine = Mockito
.mock(MultiFilmPrintRenderer.class);
Whitebox.setInternalState(autoPrintEndPoint, "_engine", engine);
這樣就設置了模擬對象。 NPE解決了
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