Testing Node.js

Introductory presentation for EVRY employees on best practices for testing Node.js projects and various test strategies.

Transcript

1. Testing Node.js applications ! HANS KRISTIAN FLAATTEN
2. ! Agenda OPTIONAL SUBHEADING • Test strategies • Tools and frameworks • Application overview • Testing demo
3. ! 3 Testing basic • Write testable code • Write tests as you develop • Add more tests when you find bugs • Test one concern at the time • Test your code
4. ! 4 Testing basic (cont.) • Few tests are better than none • Keep it simple • Don’t get caught up following complex test strategies
5. ! 5 Test levels • Unit level tests • Higher order tests • integration • system • end to end • smoke testing • happy path testing
6. ! 6 Unit level testing math.sqrt(4) == 2 // root of 4 should be 2 User.getAge() == 32 // user age should be 32
7. ! 7 Higher order testing app.post('/api') .header('Auth', token) .send(data) .expect(201) .expect({ message: 'Created' })
8. ! 8 Tools and frameworks • Test runner • Assertion library • Helpers; spies, stubs, and mocks • Syntax linting • Test coverage
9. ! 9 Test runner: mocha describe('Array', () => { describe('#indexOf()', () => { it('returns -1 if not present', () => { [1,2,3].indexOf(4) == -1 }); }); });
10. ! 10 Assertion library: assert const assert = require('assert'); assert.equal(str, 'My String'); assert.equal(int, 12345678901); assert.deepEqual(obj1, obj2);
11. ! 11 Application Overview   API DB POST GET INSERT QUERY  User
12. ! 12 Application Overview $ ls |-index.js |-todo.js |-test/ | |-api.js | |-index.js | |-todo.js
13. " !
14. evry.facebook.com/groups/hack4evry
15. ! Future presentations EVERY THURSDAY AT 12 • 09/02 - Node.js introduction • 16/02 - Node.js testing • 23/02 - Jenkins CI/CD • 02/03 - Node.js packages • 09/03 - Docker 101 • 16/03 - Microservices 101 • 23/03 - AWS Lambda (serverless) • 30/03 - TBA