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Testing Number Constraint Utilities in Video.js

This test suite validates the numerical utility functions in Video.js, specifically focusing on the clamp function that ensures values stay within defined boundaries. The tests verify proper number constraints and edge case handling for the core math operations.

Test Coverage Overview

The test suite provides comprehensive coverage of the clamp utility function, verifying its ability to constrain numbers within specified ranges.

Tests normal value clamping within ranges
Validates boundary conditions at min/max values
Handles edge cases like NaN inputs
Verifies negative number handling

Implementation Analysis

The testing approach uses QUnit’s module and test structure to organize related test cases logically. The implementation leverages QUnit’s assert methods for precise value comparison checking.

Uses strictEqual for exact value matching
Implements expect count verification
Organizes tests in nested module structure

Technical Details

Test Framework Configuration:

QUnit test framework
ESLint environment configuration
ES6 module import system
Strict assertion checking enabled

Best Practices Demonstrated

The test suite demonstrates strong testing practices through clear organization and thorough validation.

Explicit test case descriptions
Comprehensive edge case coverage
Modular test organization
Clear assertion expectations

videojs/videoJs

test/unit/utils/num.test.js

            
/* eslint-env qunit */
import * as Num from '../../../src/js/utils/num';

QUnit.module('utils/num', function() {

  QUnit.module('clamp');

  QUnit.test('keep a number between min/max values', function(assert) {
    assert.expect(5);
    assert.strictEqual(Num.clamp(5, 1, 10), 5);
    assert.strictEqual(Num.clamp(5, 1, 5), 5);
    assert.strictEqual(Num.clamp(5, 1, 2), 2);
    assert.strictEqual(Num.clamp(-1, 1, 10), 1);
    assert.strictEqual(Num.clamp(NaN, 1, 10), 1);
  });
});