Mockito - 想要但未调用:实际上，与这个模拟的交互为零

Question

我知道至少已经问了两个相同的问题，但我仍然无法弄清楚为什么我会出现异常。我需要对此方法进行单元测试：

void setEyelet(final PdfWriter printPdf, final float posX, final float posY) {
    InputStream is = WithDefinitions.class.getResourceAsStream(RES_EYELET); //RES_EYELET is a pdf.
    PdfContentByte canvas = printPdf.getDirectContent();
    PdfReader reader = new PdfReader(is);
    PdfImportedPage page = printPdf.getImportedPage(reader, 1);
    canvas.addTemplate(page, posX, posY);
    reader.close();
}

并验证

canvas.addTemplate(page, posX, posY); 

被召唤了。

此方法嵌套在另一个方法中：

void computeEyelets(final PdfWriter printPdf) {
        float lineLeft = borderLeft + EYELET_MARGIN;
        float lineRight = printPdfWidth - borderRight - EYELET_MARGIN - EYELET_SIZE;
        float lineTop = printPdfHeight - borderTop - EYELET_MARGIN - EYELET_SIZE;
        float lineBottom = borderBottom + EYELET_MARGIN;
        float eyeletDistMinH = 20;
        if (eyeletDistMinH != 0 || eyeletDistMinV != 0) {
         setEyelet(printPdf, lineLeft, lineBottom);
    }

最后是我的单元测试代码：

public void computeEyeletsNoMirror() {
    PdfWriter pdfWriter = Mockito.mock(PdfWriter.class);
    PdfContentByte pdfContentByte = Mockito.mock(PdfContentByte.class);
    Mockito.when(pdfWriter.getDirectContent()).thenReturn(pdfContentByte);
    WithDefinitions withDefinitions = Mockito.mock(WithDefinitions.class);
    float lineLeft = BORDER_LEFT + EYELET_MARGIN;
    float lineBottom = BORDER_BOTTOM + EYELET_MARGIN;
    withDefinitions.setEyeletDistMinH(20);
    withDefinitions.setEyeletDistMinV(20);
    withDefinitions.setMirror(false);
    withDefinitions.computeEyelets(pdfWriter);
    Mockito.verify(pdfContentByte).addTemplate(
        Mockito.any(PdfImportedPage.class),
        Mockito.eq(lineLeft),
        Mockito.eq(lineBottom)
    );

我没有最终的方法，我使用模拟的pdf编写器作为参数。我还需要做什么才能使测试通过？

更新以下是异常消息：

Wanted but not invoked:
 pdfContentByte.addTemplate(
  <any>,
  62.36221,
  62.36221
);
-> at ...tools.pdf.superimpose.WithDefinitionsTest.computeEyeletsNoMirror(WithDefinitionsTest.java:336)
Actually, there were zero interactions with this mock.

更新 2用真实实例替换模拟的 WithDefinition 对象后，我得到以下输出：

Argument(s) are different! Wanted:
pdfContentByte.addTemplate(
  <any>,
  62.36221,
  62.36221
);
-> at ...tools.pdf.superimpose.WithDefinitionsTest.computeEyeletsNoMirror(WithDefinitionsTest.java:336)
Actual invocation has different arguments:
pdfContentByte.addTemplate(
  null,
  48.18898,
  48.18898
);
-> at ...tools.pdf.superimpose.WithDefinitions.setEyelet(WithDefinitions.java:850)

Answer 1

您正在模拟正在测试的对象。这是没有道理的。您应该创建一个真正的 WithDefinition 对象并调用其真实方法来测试它。如果你模拟它，根据定义，它的所有方法都会被什么都不做的模拟实现所取代。

取代

WithDefinitions withDefinitions = Mockito.mock(WithDefinitions.class);

通过类似的东西

WithDefinitions withDefinitions = new WithDefinitions();