英文:
How to assert a partial match with stretchr/testify/mock AssertCalled?
问题
考虑以下Go语言中的单元测试文件。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})
// 我不关心传递的Age是多少，只关心Name
d.AssertCalled(t, "doWithThing", Person{Name: "John"})
}
这个测试失败是因为testify在比较时使用了Age: 0，而我没有传递年龄。我理解这一点，但我想知道如何对传递的参数的部分进行断言？我希望这个测试通过，无论Age是多少，只要Name = John。
英文:
Consider this unit test file in Go. I'm using github.com/stretchr/testify/mock package.
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"})
}
This tests fails because testify uses Age: 0 in the comparison when I don't pass an age. I get that, but I'm wondering, how do I assert against a partial of the argument that was passed? I want this test to pass whatever Age is, so long as Name = John
答案1
得分: 11
简而言之，它使用mock.argumentMatcher（未导出）将任意匹配器函数包装起来：
> argumentMatcher执行自定义参数匹配，返回参数是否与期望的fixture函数匹配。
特别地，mock.MatchedBy的参数是：
> [...] 一个接受单个参数（期望类型）并返回布尔值的函数
因此，你可以按照以下方式使用它：
personNameMatcher := mock.MatchedBy(func(p Person) bool {
return p.Name == "John"
})
d.AssertCalled(t, "doWithThing", personNameMatcher)
英文:
Use mock.MatchedBy.
In short, it wraps an arbitrary matcher function with a mock.argumentMatcher (unexported):
> argumentMatcher performs custom argument matching, returning whether or not the argument is matched by the expectation fixture function.
In particular, the argument of mock.MatchedBy is:
> [...] a function accepting a single argument (of the expected type) which returns a bool
So you can use it as follows:
personNameMatcher := mock.MatchedBy(func(p Person) bool {
return p.Name == "John"
})
d.AssertCalled(t, "doWithThing", personNameMatcher)
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