Mobile Development and JavaScript | Module 4

Course Name: Mobile Development and JavaScript

Course Link: Mobile Development and JavaScript

These are Mobile Development and JavaScript Week 4 Coursera Answers

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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:

Task 2: Update these code and save files:

package.json:

timesTwo.js:

timesTwo.test.js:

Task 3: Submit assignment.

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These are Mobile Development and JavaScript Week 4 Coursera Answers

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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

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

• Jest
• JFrame
• JavaFrame
• JavaTest

Answer: Jest

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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.

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These are Mobile Development and JavaScript Week 4 Coursera Answers

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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.

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

• True.
• False

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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.

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These are Mobile Development and JavaScript Week 4 Coursera Answers

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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.

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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

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

• Node.js
• Cyprus
• Jest
• Protractor

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These are Mobile Development and JavaScript Week 4 Coursera Answers

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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.

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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

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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

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These are Mobile Development and JavaScript Week 4 Coursera Answers

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

• npm
• pkg
• node
• package

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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.

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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

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These are Mobile Development and JavaScript Week 4 Coursera Answers

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

• True
• False

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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

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

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

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These are Mobile Development and JavaScript Week 4 Coursera Answers

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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

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These are Mobile Development and JavaScript Week 4 Coursera Answers

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