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我有一個DAO類作爲從我的存儲庫獲取數據的單獨層。我讓Singleton類和方法是靜態的。使用Typescript和Sinon測試單例類中的靜態方法
在另一個類中,我提出了其他服務方法來轉換數據。我想爲此代碼編寫測試,但不成功。
如何模擬道存儲庫的方法?
這是我試過到目前爲止:
// error: TS2345: Argument of type "getAllPosts" is not assignable to paramenter of type "prototype" | "getInstance"
const dao = sinon.stub(Dao, "getAllPosts");
// TypeError: Attempted to wrap undefined property getAllPosts as function
const instance = sinon.mock(Dao);
instance.expects("getAllPosts").returns(data);
export class Dao {
private noPostFound: string = "No post found with id";
private dbSaveError: string = "Error saving to database";
public static getInstance(): Dao {
if (!Dao.instance) {
Dao.instance = new Dao();
}
return Dao.instance;
}
private static instance: Dao;
private id: number;
private posts: Post[];
private constructor() {
this.posts = posts;
this.id = this.posts.length;
}
public getPostById = (id: number): Post => {
const post: Post = this.posts.find((post: Post) => {
return post.id === id;
});
if (!post) {
throw new Error(`${this.noPostFound} ${id}`);
}
else {
return post;
}
}
public getAllPosts =(): Post[] => {
return this.posts;
}
public savePost = (post: Post): void => {
post.id = this.getId();
try {
this.posts.push(post);
}
catch(e) {
throw new Error(this.dbSaveError);
}
}
}
這裏是上述代碼的測試用例 – muthukumar