unit-test-exercise

Write unit tests for this todo application. The code is located inside of src and you are going to write all your tests in __tests__/todo.js. Feel free to implement more functionality and test that functionality.

It can be a good idea to list all use cases (and potential errors) before starting

• I should be able to add a todo
• I should be able to remove a todo
• I should be able to remove all todos
• I should be able to edit a todo
• I should be not be able to edit a nonexisting todo

Then make your assertions based on those use cases.

Installation

git clone https://github.com/FEND16/unit-test-exercise
cd unit-test-exercise
yarn #or npm i

Run tests

Single run

yarn test

npm run test

Watch mode

yarn test:watch

npm run test:watch

Jest syntax

I have written a first test for you to start with:

/* So the functionalty is tested in isolation. This means
 * that each new test doesn't know anything about the previous
 * when mutating the state  (the list of todos) it is important
 * that we reset the state after each test */
beforeEach(() => {
  jest.resetModules();
});

test('returns all todos', () => {
  /* require the list for each test to guarantee isolated tests */
  const todoList = require('../src/todoList');
  expect(todoList.getAllTodos()).toHaveLength(4);
});

Solution

Some example solutions is located under the branch solution