Use docstring-like data tables in JavaScript tests, similar to Cucumber's Scenario Outline Examples: or Spock where: blocks.
describe("Using Mocha and Chai.expect", (done) => {
function spec(a, b, c) {
expect(c).to.equal(a + b)
where: `
a | b | c
1 | 2 | 3
4 | -5 | -1
`;
}
where(spec).forEach({ params, test } => {
var { a, b, c } = params
it(`${c} should equal ${a} + ${b}.`, test)
})
done()
})The where(spec) call returns an array of scenarios (or errors - more on that elsewhere). A scenario contains a params map of key-value pairs, and a test function.
In cases where the testing library uses a flattened pattern, such as QUnit, and Tape, you can define the test name or message in the spec or test function itself, and call the scenario test directly in the iteration callback.
In cases where the testing library uses the describe-it pattern, such as Mocha and Jasmine, you can define the test name in each scenario iteration function, then pass both the name and the test function, e.g., as it(name, test).
Read more about this in the library examples document.
ES2015 module support (i.e., JavaScript import statements):
- Node.js: version 14, see details at https://nodejs.org/api/esm.html
- Browsers: All but Internet Explorer, see table at https://caniuse.com/mdn-javascript_statements_import
- from npm:
npm install wheredoc - from github:
git clone https://github.com/dfkaye/wheredoc.git
Created on Node.js, version 14.13.0, using Mocha 8.1.3 and Chai 4.2.0.
Run with npm test
These have both passing and failing examples.
- mocha (using chai):
npm run mocha-node - qunit (using qunit-tap):
npm run qunit-node - tape (using tape-describe):
npm run tape
The browser suites run with live-server and download the testing libraries from https://unpkg.com. You should install live-server globally, npm install -g live-server, before running these examples.
These have both passing and failing examples.
- mocha (using chai):
npm run mocha - qunit:
npm run qunit