英文:
Can any one explain in which case we use PowerMockito.when() and PowerMockito.doReturn()
问题
我在为我的服务类编写测试用例，但我不确定何时使用PowerMockito.when()和PowerMockito.doReturn()，因为它们的行为在我看来很相似。
英文:
I was writing test case for my service class but i m not sure when to use PowerMockito.when() and PowerMockito.doReturn() as both behavior looks similar to me.
答案1
得分: 0
从我的理解来看，doReturn() 和 when() 几乎是相同的，但我发现在 when() 中，在编译时会对返回的值进行类型检查，而在 doReturn() 中，在编译时不会对返回的值进行类型检查。
例如：
案例1：
PowerMockito.when(mongoTemplate.getCollection(Mockito.eq("testdoc"))).thenReturn(mongoCollection);
案例2：
powerMockito.doReturn(mongoCollection).when(mongoTemplate).getCollection(Mockito.eq("test-doc"));
在案例1中，mongoCollection 的类型在编译时会进行检查，而在案例2中，mongoCollection 的类型在编译时不会被检查。
英文:
From my understanding doReturn() and when() are almost equal ,but the difference which i found in when() type-checking of the value that you're returning at compile time where as
in doReturn() there is no type-checking of the value that you're returning at compile time
For Example:
case1:
PowerMockito.when(mongoTamplate.getCollection(Mockito.eq("testdoc"))).thenReturn(mongoCollection);
case2:
powerMockito.doReturn(mongoCollection).when(mongoTamplate).getCollection(Mockito.eq("test-doc"))
In case 1 type of mongoCollection is checked at compile time where as in case2 type of mongoCollection is not checked at compilation
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