Node.js Jest Testing

This repository serves as the solution to a task writing unit tests using the Jest API.

How to run

# run unit tests
$ npm run test

# with logging
$ npm run test:verbose

Simple tests

src/01-simple-tests/index.test.ts

Write unit tests for the simpleCalculator function, which performs basic mathematical operations - addition, subtraction, division, multiplication, and exponentiation. Your task is to verify that the operations are executed correctly and that the function returns null for invalid input.

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Table tests

src/02-table-tests/index.test.ts

Rewrite the tests written in the previous task using the table-driven testing approach, utilizing the appropriate Jest API.

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Error handling & async

src/03-error-handling-async/index.test.ts

Test functions that work asynchronously/throw/reject exceptions.

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Testing class

src/04-test-class/index.test.ts

Test a class representing a bank account that implements corresponding operations.

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Partial mocking

src/05-partial-mocking/index.test.ts

Utilize the Jest API to partially mock the contents of a module.

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Mocking Node.js API

src/06-mocking-node-api/index.test.ts

Test the proper usage of the Node.js API based on commonly used APIs such as the fs module, as well as setTimeout and setInterval.

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Mocking library API

src/07-mocking-lib-api/index.test.ts

Test the function that utilize library APIs is working correctly (with commonly used libraries such as axios and lodash).

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Snapshot testing

src/08-snapshot-testing/index.test.ts

Use snapshot testing with Jest and compare it to regular comparison testing.