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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
我正在为受保护的方法编写测试用例,该方法称为
protected boolean printMultipleImages(int rows, int cols, IIOImage[] imgs,
PrintMode mode, AutomaticCroppingOption crop,
double reduction, int renderOption)
在此方法中,将初始化数组变量,下面的代码显示了如何
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.
在下面突出显示的行中,变量rImageArr
尚未初始化并且为null,方法调用engine.renderAcrossFilms(multiFilmRenderRequest, prop);
给我null,即使我对其进行模拟以返回内容并且该控件进入该方法内部并给出Null Pointer Exception也不应该发生,因为我在模拟它。 此处使用的所有变量都是该方法的局部变量。
RenderedImage[] rImageArr =engine.renderAcrossFilms(multiFilmRenderRequest, prop);
这就是我嘲笑方法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);
}
我希望我的问题很清楚,希望你能帮助我
在您要测试的方法中,它将创建新实例
MultiFilmRenderRequest multiFilmRenderRequest = new MultiFilmRenderRequest(renderOption, request,new ChoppingPreferences());
并将其用作模拟方法的参数。 但是您可能已经嘲笑了该方法提供的参数不等于printMultipleImages方法传递给引擎的参数。
除此之外,我可以看到PrinterProperties prop = Mockito.mock(PrinterProperties.class);
但是此模拟类尚未使用,因此目标测试方法可能还会发送另一个PrinterProperties对象。
您可以使用
engine.renderAcrossFilms(Mockito.any(MultiFilmRenderRequest.class),Mockito.any(PrinterProperties.class))
当您提供更多详细信息时,我将继续扩展此答案,但是根据最新更新,您将:
MultiFilmPrintRenderer engine =
Whitebox.getInternalState(autoPrintEndPoint, "_engine");
// ...
Mockito.when(engine.renderAcrossFilms(multiFilmRenderRequest, prop))
.thenReturn(renderAcrossFilms);
那么,这个Whitebox.getInternalState是否返回模拟对象?
我在用于调用要尝试模拟的方法的engine
对象上创建了一个模拟,并执行了setInternalState。
MultiFilmPrintRenderer engine = Mockito
.mock(MultiFilmPrintRenderer.class);
Whitebox.setInternalState(autoPrintEndPoint, "_engine", engine);
这样就设置了模拟对象。 NPE解决了
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