[英]Mockito doNothing on a method inside a nested mock
Suppose I have 3 classes, ClassA which contains a ClassB which contains a ClassC. 假设我有3个类,ClassA包含一个ClassB,ClassB包含一个ClassC。 I'm trying to test a method inside ClassA, that method needs to call ClassB to get the instance of ClassC and execute a VOID method inside ClassC (I know this wrong, cause ClassA should not be aware of ClassC, code smell, this is not my code and just trying to create a test of it). 我正在尝试在ClassA中测试一个方法,该方法需要调用ClassB来获取ClassC的实例并在ClassC中执行VOID方法(我知道这是错误的,因为ClassA不应该知道ClassC,代码有异味,这是而不是我的代码,而只是尝试对其进行测试)。 However when I try to skip that method call using Mockito.doNothing I get the following error: 但是,当我尝试使用Mockito.doNothing跳过该方法调用时,出现以下错误:
org.mockito.exceptions.misusing.UnfinishedStubbingException:
E.g. thenReturn() may be missing.
Examples of correct stubbing:
when(mock.isOk()).thenReturn(true);
when(mock.isOk()).thenThrow(exception);
doThrow(exception).when(mock).someVoidMethod();
Hints:
1. missing thenReturn()
2. you are trying to stub a final method, you naughty developer!
3: you are stubbing the behaviour of another mock inside before 'thenReturn' instruction if completed
Here's the code: 这是代码:
ClassA: A类:
public class ClassA {
private ClassB classB;
public ClassA(ClassB classB) {
this.classB = classB;
}
public void methodToTest() {
classB.getClassC().someVoidMethod("123");
}
}
ClassB: B类:
public class ClassB {
private ClassC classC;
public ClassB(ClassC classC) {
this.classC = classC;
}
public ClassC getClassC() {
return classC;
}
}
ClassC: ClassC:
public class ClassC {
public void someVoidMethod(String arg) {
System.out.println(arg);
}
}
Test Class 测试班
@RunWith(MockitoJUnitRunner.class)
public class ClassATest {
@InjectMocks
private ClassA classA;
@Mock(answer = Answers.RETURNS_DEEP_STUBS)
private ClassB classB;
@Mock
private ClassC classC;
@Test
public void test() {
Mockito.doNothing().when(classB.getClassC()).someVoidMethod("123");
}
}
Once again, this code is not mine so I can't modify the way it uses the dependencies. 再说一次,这段代码不是我的,因此我无法修改它使用依赖项的方式。 I'm just trying to test it. 我只是想测试一下。
Quick Note: Mockito.when(...).thenReturn(...) works fine, but this is not my case since the method I'm trying to Mock is void. 快速说明:Mockito.when(...)。thenReturn(...)可以正常工作,但这不是我的情况,因为我要模拟的方法是无效的。
I think this works. 我认为这可行。 I am not sure why you can't use classB.getClassC()
instead of referencing classC
directly. 我不确定为什么不能使用classB.getClassC()
而不是直接引用classC
。
@RunWith(MockitoJUnitRunner.class)
public class ClassATest {
@InjectMocks
private ClassA classA;
@Mock(answer = Answers.RETURNS_DEEP_STUBS)
private ClassB classB;
@Mock
private ClassC classC;
@Before
public void init() {
doReturn(classC).when(classB).getClassC();
doNothing().when(classC).someVoidMethod("123");
}
@Test
public void test() {
classA.methodToTest();
}
}
Your mocking syntax is improperly arranged. 您的嘲笑语法安排不正确。
Mockito.doNothing().when(classB.getClassC()).someVoidMethod("123");
When you add spaces to this statement to individual pieces it is apparent. 当您将此语句的各个部分添加空格时,很明显。
Mockito response method method
Mockito .doNothing() .when(classB.getClassC()) .someVoidMethod("123");
When you pass a METHOD to when, it expects a thenReturn
When you pass an OBJECT to when, then you can chain a void method from that. 当您将thenReturn
传递给when时,它会期望thenReturn
当您将OBJECT传递给when时,您可以从中链接一个void方法。
Mockito.when(classB.getClassC()).thenReturn(classC);
Mockito.doNothing().when(classC).someVoidMethod("123");
The reason this doesn't work like you think it does is because classB.getClassC()
doesn't work like a getter when passed through when()
. 之所以不能像您认为的那样起作用,是因为classB.getClassC()
在通过when()
传递when()
不像吸气剂那样起作用。
You're not actually passing a reference to the object to Mockito, but a method that Mockito will stub for you with thenReturn
, which it complains is missing because you don't have one. 您实际上没有将对对象的引用传递给Mockito, 而是Mockito将使用thenReturn
为您存根的方法,它抱怨说它丢失了,因为您没有。
tl:dr; tl:dr;
Do not treat mock object methods like actual methods within mockito stubbing code. 在模拟存根代码中,请勿将模拟对象方法视为实际方法。
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