Mobile Development and JavaScript | Module 4

Course Name: Mobile Development and JavaScript

Course Link: Mobile Development and JavaScript

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Programming Assignment: Writing a Unit Test

Task 1: Add Jest as a devDependency
Open your terminal and make sure you’re in the jest-testing directory.
Run the following command to install Jest as a devDependency:

npm install jest --save-dev

Task 2: Update these code and save files:

package.json:

{
  "name": "jest-testing",
  "version": "1.0.0",
  "description": "",
  "main": "timesTwo.js.js",
  "scripts": {
    "test": "jest"
  },
  "devDependencies": {
    "jest": "^28.0.0"
  },
  "author": "",
  "license": "ISC"
}

timesTwo.js:

function timesTwo(number) {
  return number * 2;
}

module.exports = timesTwo;

timesTwo.test.js:

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

test('returns the number times 2', () => {
  expect(timesTwo(10)).toBe(20);
});

Task 3: Submit assignment.

These are Mobile Development and JavaScript Week 4 Coursera Answers

Module 4 Quiz: Programming Paradigms

Q1. The idea of having separate, small pieces of code that are easy to test is called what?

  • Unit testing
  • Integration testing
  • End-to-end testing
  • Post-hoc testing

Answer: Unit testing

Q2. Which of the following is a framework that can help you run a unit test?

  • Jest
  • JFrame
  • JavaFrame
  • JavaTest

Answer: Jest

Q3. When the following test executes, what will the test result be?
function multiply(a, b) { return a; } expect(multiply(2, 2)).toBe(4); 

  • Success.
  • Fail.
Answer: Fail.

These are Mobile Development and JavaScript Week 4 Coursera Answers

Q4. When the following test executes, what will the test result be?
function subtract(a, b) { return a – b; } expect(subtract(10, 4)).toBe(6); 

  • Success.
  • Fail.
Answer: Success.

Q5. True or False: End-to-end testing is the slowest and most expensive type of testing.

  • True.
  • False
Answer: True.

Q6. What is End-to-end testing (e2e)?

  • End-to-end testing is testing how parts of your system interact with other parts of your system.
  • End-to-end testing is a comprehensive test that starts at the beginning of your code and runs to the end.
  • End-to-end testing revolves around the idea of having separate, small pieces of code that are easy to test.
  • End-to-end testing tries to imitate how a user might interact with your application.
Answer: End-to-end testing tries to imitate how a user might interact with your application.

These are Mobile Development and JavaScript Week 4 Coursera Answers

See also  Mobile Development and JavaScript | Module 3

Q7. What is Code Coverage?

  • A measure of what percentage of your code is covered by tests.
  • What percentage of your code is complete.
  • A measure of what percentage of your code has failing tests.
  • What percentage of your code is in Javascript.
Answer: A measure of what percentage of your code is covered by tests.

Q8. The development of Node.js led to the ability to do which of the following?

  • Write full-stack JavaScript programs.
  • Estimate code coverage
  • Download and manage packages
  • Run unit tests
Answer: Write full-stack JavaScript programs.

Q9. Which of the following runtimes are typically used for building backends?

  • Node.js
  • Cyprus
  • Jest
  • Protractor
Answer: Node.js

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Q10. Integration testing is defined how?

  • Testing how parts of your system interact with other parts of your system.
  • Testing revolves around the idea of having separate, small pieces of code that are easy to test.
  • Testing tries to imitate how a user might interact with your application.
  • Testing how much of your code is covered by tests.
Answer: Testing how parts of your system interact with other parts of your system.

Q11. Which of the following is testing how parts of your system interact with other parts of your system?

  • Unit testing
  • Post-hoc testing
  • End-to-end testing
  • Integration testing
Answer: Integration testing

Q12. Which of the following are NOT one of the three types of testing?

  • End-to-end testing
  • Unit testing
  • Post-hoc testing
  • Integration testing
Answer: Post-hoc testing

These are Mobile Development and JavaScript Week 4 Coursera Answers

Q13. Which command is used to install a Node package?

  • npm
  • pkg
  • node
  • package
Answer: npm

Q14. package.json is used to do which of the following?

  • Store all the testing code.
  • Turn your code into an application.
  • Store all the dependencies required for application.
  • Download npm packages.
Answer: Store all the dependencies required for application.

Q15. True or False: If you have built a project with different node packages, they will all be listed inside the package.json file.

  • True
  • False
Answer: False

These are Mobile Development and JavaScript Week 4 Coursera Answers

See also  Mobile Development and JavaScript | Module 1

Q16. True or False: End-to-end tests can be performed in a web browser without writing code.

  • True
  • False
Answer: True

Q17. A person on your team wants to help with testing. However, they are not a developer and cannot write code. What type of testing is most suited for them?

  • End-to-end testing
  • Post-hoc testing
  • Unit testing
  • Integration testing
Answer: End-to-end testing

Q18. In Jest you use mocking by employing which of the following?

  • External mock libraries
  • Jest Fakes
  • Jest Mock functions
  • Jest Snapshot
Answer: Jest Mock functions

These are Mobile Development and JavaScript Week 4 Coursera Answers

Q19. What is the recommended way to separate the code that you are testing from its related dependencies?

  • Mocking
  • End-to-end testing
  • module.exports
  • Fakes
Answer: Mocking

These are Mobile Development and JavaScript Week 4 Coursera Answers

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