jest-getting-started-bug

package.json

{
  "name": "jest-bug",
  "version": "1.0.0",
  "description": "",
  "scripts": {
    "test": "jest"
  },
  "license": "ISC",
  "devDependencies": {
    "jest": "^18.1.0"
  }
}

sum.js

function sum(a, b) {
  return a + b;
}
module.exports = sum;

sum.test.js

const sum = require('./sum');

test('adds 1 + 2 to equal 3', () => {
  expect(sum(1, 2)).toBe(3);
});

Output:

$ npm test

> [email protected] test /foo/dev/tmp/jest-test
> jest

No tests found
No files found in /foo/dev/tmp/jest-test.
Make sure Jest's configuration does not exclude this directory.
To set up Jest, make sure a package.json file exists.
Jest Documentation: facebook.github.io/jest/docs/configuration.html