Question

This issue from 2010 hints at what I'm trying to do.

我正在进行单元测试，该测试运行代码，需要许多模拟对象来完成它需要做的事情（测试HTML + PDF渲染）。为了使这个测试成功，我需要生成许多模拟对象，并且每个对象最终都会将一些String数据返回给正在测试的代码。

我认为我可以通过实现我自己的Answer类或IMockitoConfiguration来实现这一点，但我不确定如何实现这些，所以它们只影响返回的方法字符串。

我觉得以下代码接近我想要的。它抛出一个强制转换异常java.lang.ClassCastException: java.lang.String cannot be cast to com.mypackage.ISOCountry。我认为这意味着我需要以某种方式默认或限制Answer仅影响String的默认值。

private Address createAddress(){
    Address address = mock(Address.class, new StringAnswer() );

    /* I want to replace repetitive calls like this, with a default string. 
    I just need these getters to return a String, not a specific string.

    when(address.getLocality()).thenReturn("Louisville");
    when(address.getStreet1()).thenReturn("1234 Fake Street Ln.");
    when(address.getStreet2()).thenReturn("Suite 1337");
    when(address.getRegion()).thenReturn("AK");
    when(address.getPostal()).thenReturn("45069");   
    */

    ISOCountry isoCountry = mock(ISOCountry.class);
    when(isoCountry.getIsocode()).thenReturn("US");
    when(address.getCountry()).thenReturn(isoCountry);

    return address;
}

//EDIT: This method returns an arbitrary string
private class StringAnswer implements Answer<Object> {
    @Override
    public Object answer(InvocationOnMock invocation) throws Throwable {
        String generatedString = "Generated String!";
           if( invocation.getMethod().getReturnType().isInstance( generatedString )){
               return generatedString;
           }
           else{
               return Mockito.RETURNS_DEFAULTS.answer(invocation);
           }
       }
}

如何为返回String的模拟类上的方法设置Mockito以返回生成的String？ I found a solution to this part of the question on SO

对于额外的点，如何将生成的值设为Class.methodName形式的字符串？例如"Address.getStreet1()"而不是随机字符串？

Answer 1

我能够完全回答我自己的问题。

在此示例中，生成了具有路易斯维尔位置的地址，而其他字段看起来像“address.getStreet1（）;”。

private Address createAddress(){
    Address address = mock(Address.class, new StringAnswer() );

    when(address.getLocality()).thenReturn("Louisville");

    ISOCountry isoCountry = mock(ISOCountry.class);
    when(isoCountry.getIsocode()).thenReturn("US");
    when(address.getCountry()).thenReturn(isoCountry);

    return address;
}

private class StringAnswer implements Answer<Object> {
    @Override
    public Object answer(InvocationOnMock invocation) throws Throwable {
           if( invocation.getMethod().getReturnType().equals(String.class)){
               return invocation.toString();
           }
           else{
               return Mockito.RETURNS_DEFAULTS.answer(invocation);
           }
       }
}

如何在Mockito中更改字符串的默认返回值？

1 个答案: