Intro in Testing

• DevOps
• CI/CD
• Testing
• Example

 

DevOps

➡️ Focus on People, Processes and Tools for the benefit of business agility.

1. 💡 Idea, Userstories
2. </> Code, Programming the Idea
3. ⚙️ Build, Executables
4. 📦 Deploy, Runtime Environment
5. 🔍 Manage, Production (and Testing)
6. 📈 Learn, Continuous Improvement

 

CI/CD

➡️ Build. Test. Deploy. Continuous integration, automated testing and deployment.

• Purpose: to avoid “merge hell”.
• Typically done by a CI/CD server/pipeline.
• Benefit: always have a testable and functional build.

1. CI – Continuous Integration

➡️ Commit code to a shared repo frequently.

• Commit, push/pull code constantly.
• Each commit triggers automated (unit) tests.

2. CD – Continuous Delivery/Deployment

➡️ Deploy code automatically.

• If the CI tests are successful, commits will be deployed automatically.

 

Testing

Strategies

• unit test
  • test individual units of code (e.g. single functions).
  • tools: e.g. JEST
• integration test
  • test multiple components & services and how they work together.
• e2e test
  • test entire apps, like an end user would do.
  • simulate human behavior (e.g. by clicking buttons automatically).
  • tools: e.g. CYPRESS
• performance test
• functional test
• etc.

Order

1. Unit Tests (highest priority)
2. API Tests (high priority)
3. UI Tests (normal priority)
4. Exploratory Tests (mimic user behavior to find bugs/errors)
5. UX Tests (user experience)
6. Beta Test (5% of user base)

Mocking

➡️ Use sample data. Simulate (data) input.

   

Code Example with JEST

file

• sum.js
• sum.test.js

code in sum.js

function sum( a, b ) {
	return a + b
}

test in sum.test.js

// "test suite" = collection of tests
describe( 'My Feature', () => {
	
	// description of what is being tested
	// describing the behavior of the code
	it('finds the sum of a and b', () => {

		// run/execute code
		const result = sum( 2, 2 );
	
		// test some fixed sample data
		expext( typeof result ).toBe( 'number' );
		expect( result ).toEqual( 4 );
		expect( result ).not.toBe( null );	
	} );
} );