如何使用 Mockito 验证重载方法的调用次数?

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).

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

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