TodoApp | Todo Application using ReactJs , Firebase , Express | Authentication library

Connect to your database 1st and after that start your server.

You're trying to query the database without connecting to your database.

https://mongoosejs.com/docs/connections.html#buffering

Mongoose lets you start using your models immediately, without waiting for mongoose to establish a connection to MongoDB.

That's because mongoose buffers model function calls internally. This buffering is convenient, but also a common source of confusion. Mongoose will not throw any errors by default if you use a model without connecting.

In ToDoList.svelte you are calling deleteTodo(todo) but deleteTodo is undefined. Svelte should really throw a better error message here...

Edit:

Also, if you assign an event handler, you want to pass in a reference to a function like on:deleteTodo = {() => deleteTodo(todo)} or on:deleteTodo = {deleteTodo} and not call the function directly.

Replace your items migration with the following code:

Problem is in this part of your code:

You should check the Roboelectric Dependency and ensure it is testImplementation

In my case I was using this version

Use closest

In my case I had to use

I think you have to make some changes to your original test case

1. Change jest.fn() to jest.spyOn(Todo.methods, 'deleteItem') since you have to track calls to methods object in Todo component. Refer: https://jestjs.io/docs/jest-object
2. Wait for the click event to be triggered with await
3. Use toHaveBeenCalledTimes not toHaveBeenCalledWith("1")

So your final test case will look like this

Array.prototype.map() takes a second argument to set what this refers to in the mapping function, so pass this as the second argument to preserve the current context. [*]

You can try this: