unit-testing - 如何断言与 stretr/testify/mock AssertCalled 的部分匹配？

Question

在 Go 中考虑这个单元测试文件。我正在使用 github.com/stretchr/testify/mock包。

type Person struct {Name string; Age int}
type Doer struct { mock.Mock }

func (d *Doer) doWithThing(arg Person) {
    fmt.Printf("doWithThing %v\n", arg)
    d.Called(arg)
}

func TestDoer(t *testing.T) {
    d := new(Doer)
    d.On("doWithThing", mock.Anything).Return()
    d.doWithThing(Person{Name: "John", Age: 7})
    
    // I don't care what Age was passed. Only Name
    d.AssertCalled(t, "doWithThing", Person{Name: "John"})
}

此测试失败，因为 testify 在我未超过年龄时在比较中使用 Age: 0。我明白了，但我想知道，我如何断言通过的部分论点？我希望此测试通过任何 Age，只要 Name = John

Answer 1

使用mock.MatchedBy .

简而言之，它用 mock.argumentMatcher(未导出)包装任意匹配器函数:

argumentMatcher performs custom argument matching, returning whether or not the argument is matched by the expectation fixture function.

特别是，mock.MatchedBy 的参数是:

[...] a function accepting a single argument (of the expected type) which returns a bool

所以你可以像下面这样使用它:

personNameMatcher := mock.MatchedBy(func(p Person) bool {
    return p.Name == "John"
})
d.AssertCalled(t, "doWithThing", personNameMatcher)