CLI Testing Tool
A testing library that allows you to test input and outputs of your CLI command.
Note: This is WIP but it should be ready enough for most common CLI use-cases I can think of
Installation
With NPM:
npm install --save-dev cli-testing-tool With Yarn:
yarn add --dev cli-testing-toolExamples
Check out Interactive Examples on Stackblitz
Testing Colored Terminal Text
Check out this example of StackBlitz
// colored-greeting.test.js
const { createCommandInterface } = require('cli-testing-tool');
test('should print colored greetings', async () => {
const commandInterface = createCommandInterface('node ./graphic-print.js', {
cwd: __dirname, // considering, the test file is in the same directory as the cli file
});
await commandInterface.type('Saurabh\n');
const terminal = await commandInterface.getOutput();
// ANSI Escape codes are tokenized into readable text token in tokenizedOutput
// Helpful when libraries like inquirer or prompts add ansi-escape codes.
expect(terminal.tokenizedOutput).toBe(
"What's your name?Hi, [BOLD_START][RED_START]Saurabh[COLOR_END][BOLD_END]!"
);
// ANSI Escape codes are not tokenized.
expect(terminal.rawOutput).toBe(
`What's your name?Hi, \x1B[1m\x1B[31mSaurabh\x1B[39m\x1B[22m!`
);
// ANSI Escape codes are removed
expect(terminal.stringOutput).toBe(`What's your name?Hi, Saurabh!`);
});Code of the CLI that we're testing in above snippet
// colored-greeting.js
const readline = require('readline').createInterface({
input: process.stdin,
output: process.stdout
});
const bold = (str) => `\x1b[1m${str}\x1b[22m`;
const red = (str) => `\x1b[31m${str}\x1b[39m`;
readline.question(`What's your name?`, (name) => {
console.log(`Hi, ${bold(red('Saurabh'))}!`);
readline.close();
});Options
You can pass options as 2nd param to createCommandInterface.
The default options are:
const defaultOptions = {
typeDelay: 100, // number. delay between each `.type()` call
logData: false, // boolean. if true, logs the command data on terminal
logError: true, // boolean. if false, won't add command errors on terminal
cwd: process.cwd(), // string. working directory from where your simulated command is executed
env: undefined // object | undefined. environment variables object if there are any
};Terminal Text Parsing Support Checklist
Refer to Full List of Ansi Escape Codes that need to be handled.
- Normal text without ansi escape codes
- Colored text
- Cursor movement (Basic Support. Not tested)
- Erase Line/Screen Clear (Basic Support. Not tested)
- Screen Modes (No Support)
- Private Modes (No Support)
- Multiple Arguments (No Support. Difficult to support this)
Big Shoutout to
-
@fnky for the list of all ansi escape codes.
-
@netzkolchose for node-ansiterminal library.