Back to Repositories

Validating Core Module Exports Implementation in preactjs/preact

This test suite validates the core exports and build artifacts of the Preact library. It ensures that the main Preact module exposes all essential API functions and components required for the framework to function properly.

Test Coverage Overview

The test coverage focuses on verifying the presence and type correctness of crucial Preact exports.

Tests the existence of core API methods like createElement and render
Validates Component class export
Ensures hydrate function availability
Verifies h alias for createElement

Implementation Analysis

The testing approach uses Chai assertions within a Jest framework to validate the Preact module structure.

The implementation employs type checking with .to.be.an(‘object’) and property existence verification through .to.have.property() assertions. This pattern ensures both presence and correct typing of exports.

Technical Details

Testing Framework: Jest
Assertion Library: Chai
Test Environment: Node.js
Import Strategy: Direct module import
Test Structure: Single describe block with focused test case

Best Practices Demonstrated

The test suite demonstrates clean and focused testing practices by isolating build artifact validation.

Single responsibility principle in test organization
Clear test descriptions
Explicit assertion messages
Comprehensive API surface testing

preactjs/preact

test/node/index.test.js

            
import { expect } from 'chai';
import * as preact from '../../';

describe('build artifact', () => {
	// #1075 Check that the build artifact has the correct exports
	it('should have exported properties', () => {
		expect(preact).to.be.an('object');
		expect(preact).to.have.property('createElement');
		expect(preact).to.have.property('h');
		expect(preact).to.have.property('Component');
		expect(preact).to.have.property('render');
		expect(preact).to.have.property('hydrate');
		// expect(preact).to.have.property('options');
	});
});