@valtech-commerce/jest-gwt

Given-When-Then helper for Jest.

Install

$ npm install @valtech-commerce/jest-gwt

Usage

Import the package in your Jest test files and extends the base GWT.

//--------------------------------------------------------
//  xyz.gwt.js
//--------------------------------------------------------
import path from "node:path";
import { given as givenBase, when as whenBase, then as thenBase } from "@valtech-commerce/jest-gwt";

const given = { ...givenBase };
const when = { ...whenBase };
const then = { ...thenBase };

let rootPath;

given.noRootPath = () => {
	rootPath = undefined;
};

given.rootPath = (value) => {
	rootPath = value;
};

when.packageIsLoaded = () => {
	when.attempting(() => {
		require(path.join(rootPath, "package.json"));
	});
};

export { given, when, then };

//--------------------------------------------------------
//  xyz.test.js
//--------------------------------------------------------
import { given, when, then } from "./xyz.gwt";

describe("Validate package.json", () => {
	beforeEach(() => {
		given.noException();
		given.noRootPath();
	});

	test("Ensure package can be loaded", () => {
		given.rootPath("..");
		when.packageIsLoaded();
		then.shouldNotHaveThrown();
	});
});

Helpers

The package comes with multiple helpers. If you want them all, import the root package @valtech-commerce/jest-gwt.

Exception @valtech-commerce/jest-gwt/exception

Check for thrown exceptions

given.noException()

Reset exception listener

when.attempting(closure: Function)

Listen for error when executing closure

when.attemptingAsync(closure: Function)

Listen for error when executing asynchronous closure

then.shouldHaveThrown()

Exception has been thrown

then.shouldHaveThrownMessageContaining(message: string)

Exception, with message excerpt, has been thrown

then.shouldNotHaveThrown(closure: Function)

No exception has been thrown

Package @valtech-commerce/jest-gwt/package

Tests for package.json

given.noPackageRoot()

Reset root path

given.noPackageConfig()

Reset parsed config

given.noPackageNamePattern()

Reset name pattern

given.noPackageKeywords()

Reset keywords

given.packageRoot(value: string)

Specify the root path of the package.json

given.packageNamePattern(value: RegExp)

Specify a pattern for the package name

given.packageKeywords(value: string[])

Specify mandatory keywords

when.packageIsParsed()

Parse the package.json file

then.packageNameShouldBeValid()

Package name matches the defined name pattern

then.packageKeywordsShouldBeValid()

Package keywords contain at least the defined keywords

then.packageExportsShouldExist()

Package exports point to existing files

Documentation

See the Changelog to see what has changed.

Contribute

See the Contributing Guidelines for ways to get started.

See the Support Guide for ways to get help.

See the Security Policy for sharing vulnerability reports.

This project has a Code of Conduct. By interacting with this repository, organization, or community you agree to abide by its terms.

License

MIT © Valtech Canada inc.