如何使用 Mockito 验证重载方法的调用次数?

问题描述

如何使用 Mockito 检查 bar(Alpha, Baz) 是否调用了 bar(Xray, Baz) - 鉴于我的 MCVE 类 Foo:

How do I check if bar(Alpha, Baz) called bar(Xray, Baz) using Mockito - without actually calling the later, given my MCVE class Foo:

public class Foo {
    public String bar(Xray xray, Baz baz) {
        return "Xray";
    }

    public String bar(Zulu zulu, Baz baz) {
        return "Zulu";
    }

    public String bar(Alpha alpha, Baz baz) {
        if(alpha.get() instanceof Xray) {
            return bar((Xray)alpha.get(), baz);
        } else if(alpha.get() instanceof Zulu) {
            return bar((Zulu)alpha.get(), baz);
        } else {
            return null;
        }
    }
}

目前，我大致有以下 Mockito 增强的 JUnit 测试:

Currently, I have roughly the following Mockito-enhanced JUnit test:

@Test
public void testBar_callsBarWithXray() {
    Baz baz = new Baz(); //POJOs
    Alpha alpha = new Alpha();
    alpha.set(new Xray());

    Foo foo = new Foo();
    Foo stub = spy(foo); // Spying on Foo, as I want to call the real bar(Alpha, Baz)
    // Preventing bar(Xray, Baz) from being called by providing behavior/stub
    when(stub.bar(any(Xray.class), any(Baz.class))).thenReturn("ok");
    // Calling the real "parent" method
    stub.bar(alpha, baz);
    // Testing if bar(Xray, Baz) was called by bar(Alpha, Baz)
    verify(stub, times(1)).bar(any(Xray.class), any(Baz.class));
}

它失败了:

org.mockito.exceptions.verification.TooManyActualInvocations:
foo.bar(
    <any>,
    <any> ); 
Wanted 1 time:
-> at FooTest.testBar_callsBarWithXray(FooTest.java:14) 
But was 2 times. Undesired invocation:
-> at FooTest.testBar_callsBarWithXray(FooTest.java:12)

我想这是因为 any(Class.class) 匹配任何东西，并且不进行类型检查......所以，从 Mockito 的角度来看，我真的在调用 bar() 两次:在 Foo 和 FooTest 中(第 12 行).

I suppose it's because any(Class.class) matches anything, and doesn't do type checking... So, from Mockito's point of view, I'm really calling bar() twice: in Foo and in FooTest (on line 12).

我必须做什么才能让测试做我真正想要的:确保在我调用 bar(Alpha, baz)bar(Xray, Baz)>(同时拦截对bar(Xray, Baz)的调用)?

What do I have to do to make the test do what I actually want: ensure bar(Xray, Baz) was called when I call bar(Alpha, baz) (while at the same time intercepting the call to bar(Xray, Baz))?

使用 eq() 匹配器 (when(stub.bar(eq(Xray.class), any(Baz.class))...) 会导致编译错误，Cannot resolve method 'bar(Class<Xray>, Baz)' - 但是，我可能不应该那样使用它(eq(xray)可能会更喜欢)...

Using the eq() Matcher (when(stub.bar(eq(Xray.class), any(Baz.class))...) causes a compilation error, Cannot resolve method 'bar(Class<Xray>, Baz)' - but then, I probably shouldn't use it that way anyway (eq(xray) would probably be more like it)...

另外，在相关说明中，如果我尝试使 bar(Alpha, Baz) private 的重载，我会收到 FooTest 的编译错误，声明:

Also, on a related note, if I try to make the overloads of bar(Alpha, Baz) private, I get a compilation error for FooTest, stating:

错误:(10, 12) java: bar(Xray,Baz) 在 Foo 中具有私有访问权限

Error:(10, 12) java: bar(Xray,Baz) has private access in Foo

有没有办法使用 PowerMockito 来解决这个问题?如何?(显然，我只想计算对 bar(Xray, Baz) 的调用 - 计算对 bar() 的所有重载的所有调用是不可能的......)

Is there a way to get round that using PowerMockito? How? (Obviously, I only want to count the calls to bar(Xray, Baz) - counting all calls to all overloads of bar() is out of the question...)

只需在测试的第 10 行和第 14 行使用 eq(xray) 而不是 any(Xray.class) 就可以解决问题 - 但我并不感兴趣在 what 中(特定)Xray 对象作为参数传入 bar()，只要它是 any Xray对象...

String result = foo.bar(alpha, baz);
assertEquals("Xray", result);

Alpha alpha = spy(new Alpha());
String result = foo.bar(alpha, baz);
verify(alpha).get();