Code coverage basics in Node.js - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the code coverage tool 'nyc' in a Node.js project.

Node.js

const nyc = require('[1]');

Drag options to blanks, or click blank then click option'

Amocha

Bnyc

Cjest

Dchai

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'mocha' or 'jest' instead of 'nyc' for coverage import.

Forgetting to install 'nyc' before importing.

The 'nyc' package is the standard tool for code coverage in Node.js. Importing it correctly allows you to use its features.

2fill in blank

medium

Complete the command to run tests with coverage using 'nyc' and 'mocha'.

Node.js

npm [1]

Drag options to blanks, or click blank then click option'

Atest

Brun

Cexec

Dstart

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'run' or 'start' instead of 'test' in the command.

Forgetting to configure the package.json 'test' script with 'nyc mocha'.

The 'test' command runs the test scripts. Using 'npm test' runs tests with coverage.

3fill in blank

hard

Fix the error in the coverage configuration by completing the missing key in the JSON.

Node.js

{
  "[1]": "./src",
  "reporter": ["text", "html"]
}

Drag options to blanks, or click blank then click option'

Ainclude

Bexclude

Csource

DcoverageDir

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'exclude' instead of 'include' causes wrong coverage files.

Using 'source' which is not a valid key.

The 'include' key tells 'nyc' which files to include for coverage. It should point to the source folder.

4fill in blank

hard

Fill both blanks to create a script in package.json that runs tests with coverage and outputs an HTML report.

Node.js

"scripts": {
  "coverage": "nyc --reporter=[1] [2]"
}

Drag options to blanks, or click blank then click option'

Ahtml

Bmocha

Ctext

Djest

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'text' instead of 'html' for the reporter when HTML output is needed.

Using 'jest' instead of 'mocha' if the project uses mocha.

The 'html' reporter generates an HTML report. 'mocha' runs the tests. Together they produce coverage with an HTML report.

5fill in blank

hard

Fill all three blanks to create a coverage ignore configuration that excludes test files and node_modules.

Node.js

{
  "exclude": ["[1]", "[2]", "[3]"]
}

Drag options to blanks, or click blank then click option'

Atest

Bnode_modules

C*.spec.js

Dsrc

Attempts:

3 left

💡 Hint

Common Mistakes

Including 'src' in exclude which removes source files from coverage.

Not excluding test files causing coverage to include tests.

To ignore coverage on test files and dependencies, exclude 'node_modules', 'test' folder, and '*.spec.js' files.