Mocha.js 如何监视动态调用的函数

我正在使用Javascript、Mocha、Chai和SinonJs。我想做的是监视另一个方法“compareUsingOperator”动态调用的方法“equals”。下面的代码显示了我的类“StringComparator”，其中包含两个方法“equals”和“CompareSingOperator”

在我的单元测试中，我在“equals”方法上设置了一个间谍，如下所示：

sinon.spy(actual, "equals");

private compareFunctionList: {[key in "=" | "!=" | "<>" | "<" | "<=" | ">" | ">="]: string};

    public constructor() {
        this.compareFunctionList = {
            "=" : "equals",
            "!=" : "notEquals",
            "<>" : "notEquals",
            "<" : "lessThan"
            "<=" : "lessThanOrEquals",
            ">" : "greaterThan",
            ">=" : "greaterThanOrEquals",
        };
    }

“actual”是“StringComparator”的一个实例

下一步我要打电话：

actual.compareUsingOperator("=", comparator.value1, comparator.value2);

在此方法中，执行以下代码：

const fn: Function = this.compareFunctionList[operator];
        return fn.call(this, value1, value2);

这是对“equals”方法的调用。这也是我的问题。我想知道是否叫“等于”。我使用以下断言：

assert.called(actual.equals);

我从chai/sinon那里得到的回答是：

AssertError: expected equals to have been called at least once but was never called

预期的行为应该是绿色测试

我的单元测试有什么问题？在console.log的帮助下，我可以证明已经调用了“equals”

问候

---

弗洛里安我自己找到了答案。我必须替换：

   const fn: Function = this.compareFunctionList[operator];
   return fn.call(this, value1, value2);

与：

这是：

private compareFunctionList: {[key in "=" | "!=" | "<>" | "<" | "<=" | ">" | ">="]: Function};

    public constructor() {
        this.compareFunctionList = {
            "=" : this.equals,
            "!=" : this.notEquals,
            "<>" : this.notEquals,
            "<" : this.lessThan,
            "<=" : this.lessThanOrEquals,
            ">" : this.greaterThan,
            ">=" : this.greaterThanOrEquals,
        };
    }

private compareFunctionList:{[输入“=”|“！=”|“；”|“=”]：函数}；
公共构造函数（）{
this.compareFunctionList={
“=”：this.equals，
“！=”：this.notEquals，
“”：this.notEquals，
“=”：此值大于或等于，
};
}

就像这样：

sinon.spy(actual, "equals");

private compareFunctionList: {[key in "=" | "!=" | "<>" | "<" | "<=" | ">" | ">="]: string};

    public constructor() {
        this.compareFunctionList = {
            "=" : "equals",
            "!=" : "notEquals",
            "<>" : "notEquals",
            "<" : "lessThan"
            "<=" : "lessThanOrEquals",
            ">" : "greaterThan",
            ">=" : "greaterThanOrEquals",
        };
    }

private compareFunctionList:{[输入“=”|“！=”|“=”]：string}；
公共构造函数（）{
this.compareFunctionList={
“=”：“等于”，
“！=”：“notEquals”，
“”：“notEquals”，
“=”：“大于或等于”，
};
}

现在这个类是可测试的

坦克和问候

弗洛里安

private compareFunctionList: {[key in "=" | "!=" | "<>" | "<" | "<=" | ">" | ">="]: string};

    public constructor() {
        this.compareFunctionList = {
            "=" : "equals",
            "!=" : "notEquals",
            "<>" : "notEquals",
            "<" : "lessThan"
            "<=" : "lessThanOrEquals",
            ">" : "greaterThan",
            ">=" : "greaterThanOrEquals",
        };
    }