go - 验证模拟调用的顺序

Question

我用 testify (v1.6.1) 并且需要测试如果接口(interface)的方法以正确的顺序调用。我查了documentation并试图在互联网上找到任何信息，但没有找到任何关于模拟订单检查的信息。
例子:

type InterfaceA interface {
    Execute()
}

type InterfaceB interface {
    Execute()
}

type Composition struct {
    a InterfaceA
    b InterfaceB
}

func (c * Composition) Apply() error {
    //How to check that "a" execute before "b"?
    c.a.Execute()
    c.b.Execute()
    return nil
}

Answer 1

即使存在 Unresolved 问题 (stretchr/testify/issue 741 "assert mock calls in order")，也不直接支持此功能
更普遍的问题 684 "Assert call order?"包括反驳:

IMO you should check the output of the function but not how it works internally. It may lead to testing implementation which is very hard to maintain.

虽然，在同一个线程中:

IMO there are cases to enforce order. i.e if you mock a mutex, you better check that Lock was always called before Unlock.
We can have a simple implementation where the mock has an "assertExpectationsInOrder" true/false flag that can be set before any expectations are added.

这可能会导致一些测试，例如 cassandra-operator/cmd/operator/controller_test.go 它记录事件以测试他们的订单。