blocks|key|305410|text|我不知道你为什么会得到这个错误。它一定与返回Class<?>有什么特别的关系。如果返回Class，代码可以很好地编译。这是对您正在做的操作的模拟，并且此测试通过。我认为这对你也是有效的：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|305411|package+com.sandbox;

import+org.junit.Test;
import+org.mockito.invocation.InvocationOnMock;
import+org.mockito.stubbing.Answer;

import+static+org.mockito.Mockito.*;

import+static+junit.framework.Assert.assertEquals;

public+class+SandboxTest+{

++++@Test
++++public+void+testQuestionInput()+{
++++++++SandboxTest+methodParameter+=+mock(SandboxTest.class);
++++++++final+Class<?>+userClass+=+String.class;
++++++++when(methodParameter.getParameterType()).thenAnswer(new+Answer<Object>()+{
++++++++++++@Override
++++++++++++public+Object+answer(InvocationOnMock+invocationOnMock)+throws+Throwable+{
++++++++++++++++return+userClass;
++++++++++++}
++++++++});

++++++++assertEquals(String.class,+methodParameter.getParameterType());
++++}

++++public+Class<?>+getParameterType()+{
++++++++return+null;
++++}


}|code-block|syntax|javascript|305412|entityMap^0|M|8|17|5|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|S|8|@]|D|@]|E|$]]]|L|$]]

I'm not sure why you're getting this error. It must have something special to do with returning <code>Class&lt;?&gt;</code>. Your code compiles fine if you return <code>Class</code>. This is a simulation of what you're doing and this test passes. I think this will work for you, too:

<pre><code>package com.sandbox;

import org.junit.Test;
import org.mockito.invocation.InvocationOnMock;
import org.mockito.stubbing.Answer;

import static org.mockito.Mockito.*;

import static junit.framework.Assert.assertEquals;

public class SandboxTest {

 @Test
 public void testQuestionInput() {
 SandboxTest methodParameter = mock(SandboxTest.class);
 final Class&lt;?&gt; userClass = String.class;
 when(methodParameter.getParameterType()).thenAnswer(new Answer&lt;Object&gt;() {
 @Override
 public Object answer(InvocationOnMock invocationOnMock) throws Throwable {
 return userClass;
 }
 });

 assertEquals(String.class, methodParameter.getParameterType());
 }

 public Class&lt;?&gt; getParameterType() {
 return null;
 }


}
</code></pre>

blocks|key|305434|text|此外，解决此问题的一种更简洁的方法是使用do语法，而不是when。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|305435|doReturn(User.class).when(methodParameter).getParameterType();|code-block|syntax|javascript|305436|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Also, a slightly more terse way to get around this is to use the do syntax instead of when.

<pre><code>doReturn(User.class).when(methodParameter).getParameterType();
</code></pre>

blocks|key|305468|text|Class<?>+userClass+=+User.class;
OngoingStubbing<Class<?>>+ongoingStubbing+=+Mockito.when(methodParameter.getParameterType());
ongoingStubbing.thenReturn(userClass);|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|305469|Mockito.when返回的OngoingStubbing<Class<?>>与ongoingStubbing的类型不同，因为每个“？”通配符可以绑定到不同的类型。|unstyled|offset|length|style|CODE|305470|要使类型匹配，需要显式指定type参数：|305471|Class<?>+userClass+=+User.class;
Mockito.<Class<?>>when(methodParameter.getParameterType()).thenReturn(userClass);|305472|entityMap^0|0|0|C|F|P|15|F|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|R|8|@$G|S|H|T|I|J]|$G|U|H|V|I|J]|$G|W|H|X|I|J]]|9|@]|A|$]]|$1|K|3|L|5|F|7|Y|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|Z|8|@]|9|@]|A|$B|C]]|$1|O|3|-4|5|F|7|10|8|@]|9|@]|A|$]]]|P|$]]

<pre><code>Class&lt;?&gt; userClass = User.class;
OngoingStubbing&lt;Class&lt;?&gt;&gt; ongoingStubbing = Mockito.when(methodParameter.getParameterType());
ongoingStubbing.thenReturn(userClass);
</code></pre>

The <code>OngoingStubbing&lt;Class&lt;?&gt;&gt;</code> returned by <code>Mockito.when</code> is not the same type as <code>ongoingStubbing</code> because each '?' wildcard could be bound to a different type.

To make the types match, you need to specify the type parameter explicitly:

<pre><code>Class&lt;?&gt; userClass = User.class;
Mockito.&lt;Class&lt;?&gt;&gt;when(methodParameter.getParameterType()).thenReturn(userClass);
</code></pre>

blocks|key|305514|text|我发现这里的代码示例与最初在接受答案的SandBoxTest中使用的methodParameter.getParameterType()有些混淆。在我做了更多的挖掘之后，我发现another+thread+pertaining+to+this+issue提供了一个更好的例子。这个例子清楚地表明，我需要的Mockito调用是doReturn(myExpectedClass).when(myMock).callsMyMethod(withAnyParams).使用该表单允许我模拟Class的返回。希望这篇笔记能帮助将来搜索类似问题的人。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|305515|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/10554955/mock-method-with-generic-and-extends-in-return-type^0|2G|13|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

I found the code examples here a little confusing with the use of methodParameter.getParameterType() first used in the accepted answer's SandBoxTest. After I did a little more digging I found <a href="https://stackoverflow.com/questions/10554955/mock-method-with-generic-and-extends-in-return-type">another thread pertaining to this issue</a> that provided a better example. This example made it clear the Mockito call I was in need of was doReturn(myExpectedClass).when(myMock).callsMyMethod(withAnyParams). Using that form allows me to mock a return of Class. Hopefully this note will help someone searching on a similar problem in the future.

blocks|key|88548|text|您可以简单地从类中删除)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|88549|Class+userClass+=+User.class;
when(methodParameter.getParameterType()).thenReturn(userClass);|code-block|syntax|javascript|88550|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

You can simply remove from Class))

<pre><code>Class userClass = User.class;
when(methodParameter.getParameterType()).thenReturn(userClass);
</code></pre>

I'm trying to write a unit test, and to do that I'm writing a when statement for a Mockito mock, but I can't seem to get eclipse to recognize that my return value is valid.

Here's what I'm doing:

<pre><code>Class&lt;?&gt; userClass = User.class;
when(methodParameter.getParameterType()).thenReturn(userClass);
</code></pre>

The return type of <code>.getParameterType()</code> is <code>Class&lt;?&gt;</code>, so I don't understand why eclipse says, <code>The method thenReturn(Class&lt;capture#1-of ?&gt;) in the type OngoingStubbing&lt;Class&lt;capture#1-of ?&gt;&gt; is not applicable for the arguments (Class&lt;capture#2-of ?&gt;)</code>. It offers to cast my userClass, but that just makes some garbled stuff eclipse says it needs to cast again (and can't cast).

Is this just an issue with Eclipse, or am I doing something wrong?

Can't return Class Object with Mockito

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我正在尝试编写一个单元测试，为此我正在为一个Mockito mock编写一个when语句，但是我似乎无法让eclipse识别我的返回值是有效的。这就是我要做的：Class<?> userClass = User.class;when(methodParameter.getParameterType()).thenRet...

问无法使用Mockito返回Class对象
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