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Module quiz: Testing :Programming with JavaScript (Meta React Native Specialization) Answers 2025

1. Which is a unit testing framework?

✔️ Jest
❌ JFrame
❌ JavaFrame
❌ JavaTest

2. Test result?

function multiply(a, b) { return a; }
expect(multiply(2, 2)).toBe(4);

✔️ Fail
❌ Success

(Because it returns a instead of a * b)

3. End-to-end testing is slowest & most expensive.

✔️ True
❌ False

4. What is Code Coverage?

✔️ A measure of what percentage of your code is covered by tests.
❌ Percentage failing tests
❌ Percentage complete
❌ Percentage written in JS

5. Node.js led to ability to do what?

✔️ Write full-stack JavaScript programs
❌ Estimate code coverage
❌ Run unit tests
❌ Download packages

6. NOT one of the three types of testing?

✔️ Post-hoc testing
❌ Unit testing
❌ Integration testing
❌ End-to-end testing

7. What is npm used for?

✔️ Use many libraries/frameworks as Node.js modules
❌ Add code from StackOverflow
❌ Build backend
❌ Test coverage

8. File listing required node packages?

✔️ package.json
❌ node.json
❌ npm.json
❌ pkg.json

9. Non-coder wants to help with testing. Which test?

✔️ End-to-end testing
❌ Unit testing
❌ Integration testing
❌ Post-hoc testing

10. Best way to separate code from dependencies?

✔️ Mocking
❌ End-to-end testing
❌ module.exports
❌ Fakes

✅ Summary Table

Q.No Correct Answer Short Explanation
1 Jest ✔️ Common JS testing framework.
2 Fail ✔️ Function returns wrong value.
3 True ✔️ E2E tests are slow & costly.
4 Code covered by tests ✔️ Measures tested code %
5 Full-stack JS ✔️ Node enables JS backend too.
6 Post-hoc testing ✔️ Not a real test category.
7 Use Node modules ✔️ npm manages packages.
8 package.json ✔️ Stores all dependencies.
9 End-to-end testing ✔️ Non-devs can run functional tests.
10 Mocking ✔️ Replaces dependencies in tests.