Typescript 断言修饰符抛出
我已经创建了一个decorator,它包含一个规则,当它与一个类一起使用多次时将抛出,它的一个真正基本的版本如下所示:Typescript 断言修饰符抛出,typescript,mocha.js,decorator,sinon,chai,Typescript,Mocha.js,Decorator,Sinon,Chai,我已经创建了一个decorator,它包含一个规则,当它与一个类一起使用多次时将抛出,它的一个真正基本的版本如下所示: function someDecorator(target: any) { var msg = "Decorator can only be applyed once"; if(target.annotated != undefined) throw new Error(msg); target.annotated = true; } 因此,如果开发人
function someDecorator(target: any) {
var msg = "Decorator can only be applyed once";
if(target.annotated != undefined) throw new Error(msg);
target.annotated = true;
}
因此,如果开发人员尝试多次使用该开发人员,它将抛出:
@someDecorator
@someDecorator // throws
class Test {
}
我想写一个单元测试来验证这个功能。我用的是摩卡、柴和西农
我怎么能断言某个装饰师抛出了什么
我怎么能断言某个装饰师抛出了什么
您基本上需要调用它两次(
someDecorator(someDecorator(function(){})
)和另一种可能的方法:
declare function __decorate(decorators, target, key?, desc?);
declare function __param(paramIndex, decorator);
describe("@named decorator \n", () => {
it("It should throw when applayed mutiple times \n", () => {
var useDecoratorMoreThanOnce = function() {
__decorate([
__param(0, named("a")),
__param(0, named("b"))
], NamedTooManyTimesWarrior);
};
var msg = "Metadadata key named was used more than once in a parameter.";
expect(useDecoratorMoreThanOnce).to.throw(msg);
});
});