Test

integration testing

Unit testing

functional testing

Jest

we hava a xxx.js

create a xxx.test.js

Using Babel

To use Babel, install required dependencies via yarn

"dependencies": { "babel-core": "^6.26.3", "babel-jest": "^23.6.0", "babel-preset-env": "^1.7.0", "jest": "^24.0.0" }

Using webpack

Jest can be used in projects that use webpack to manage assets, styles, and compilation.

Common Matchers

The simplest way to test a value is with exact equality.

test('two plus two is four', () => {
  expect(2 + 2).toBe(4);
});

Jasmine

describe("A suite is just a function", function() {
  var a;

  it("and so is a spec", function() {
    a = true;

    expect(a).toBe(true);
  });
});444444