First React tests written

Hello!
I made first step into writing maintainable code. I wrote first tests! I thought it will be hard to test React components and states, because they work asynchronously. But it was definitely not. I used delivered with "Create React App" Jest and I combined it with Enzyme library. I was surprised, there is airbnb.io website and it doesn't help you book homes :D. But it allows you to do other very interesting things. Moving to my testing adventure.

What can I say about testing React app is that it's very similar to testing pure JavaScript things. I've had experience with that before so I knew a bit how testing works. Previously I used Jasmine (no, I didn't use any girl to tests, this just testing framework's name ;D ).

• To start testing I added few devDependencies to package.json file in my project and installed it with npm:

"devDependencies": {
  "ajv": "^6.4.0",
  "babel-jest": "^22.4.3",
  "babel-preset-env": "^1.6.1",
  "babel-preset-react": "^6.24.1",
  "jest": "^22.4.3",
  "enzyme-adapter-react-16": "^1.1.1",
  "enzyme": "^3.3.0",
  "sinon": "^5.0.3"
}

• After that I created first test file ended with "test.js" what allowed test runner to find and run my test. As I said before testing JS project was similar to testing React project. It's because in Jasmine and in Jest "describe" and "it" methods are used. In my opinion it's intuitive and cool.

describe('0 buttons clicked', () => {
  it("answer button doesn't have class `checked`", () => {
    expect(body.find('button').at(1).hasClass('checked')).toBeFalsy();
  });
});

• And this is how it looks in cmd. (Imo readable and cool)

You can find of course all my code and check how those tests work by visiting my GitHub. That's all for now, thanks for reading.

Have a good day/night! ;D