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Testing String Utility Functions in video.js

This test suite validates string manipulation utilities in Video.js, focusing on case conversion and string comparison functionality. The tests ensure reliable text transformation operations essential for consistent string handling across the video player implementation.

Test Coverage Overview

The test suite provides comprehensive coverage of string utility functions including title case conversion, case-insensitive comparison, and lowercase transformation. Key functionality tested includes:

Title case conversion validation
Case-insensitive string comparison
Lowercase transformation verification

Edge cases covered include mixed case inputs and various string patterns.

Implementation Analysis

The testing approach utilizes QUnit’s module and test structure to organize related string manipulation tests. The implementation follows a clear pattern of input-output validation using QUnit’s assertion methods, particularly leveraging the ok() method for boolean comparisons.

The tests demonstrate both positive and negative test cases, especially in the titleCaseEquals comparisons.

Technical Details

Testing tools and setup:

QUnit as the primary testing framework
ESLint configuration for maintaining code quality
ES6 module import system for accessing utility functions
Assertion-based validation using QUnit’s assert object

Best Practices Demonstrated

The test suite exemplifies several testing best practices:

Clear test case isolation and naming
Comprehensive positive and negative assertions
Modular test organization using QUnit.module
Consistent testing patterns across related functionality

videojs/videoJs

test/unit/utils/str.test.js

            
/* eslint-env qunit */
import * as Str from '../../../src/js/utils/str.js';

QUnit.module('utils/str');

QUnit.test('toTitleCase should make a string start with an uppercase letter', function(assert) {
  const foo = Str.toTitleCase('bar');

  assert.ok(foo === 'Bar');
});

QUnit.test('titleCaseEquals compares whether the TitleCase of two strings is equal', function(assert) {
  assert.ok(Str.titleCaseEquals('foo', 'foo'), 'foo equals foo');
  assert.ok(Str.titleCaseEquals('foo', 'Foo'), 'foo equals Foo');
  assert.ok(Str.titleCaseEquals('Foo', 'foo'), 'Foo equals foo');
  assert.ok(Str.titleCaseEquals('Foo', 'Foo'), 'Foo equals Foo');

  assert.ok(Str.titleCaseEquals('fooBar', 'fooBar'), 'fooBar equals fooBar');
  assert.notOk(Str.titleCaseEquals('fooBAR', 'fooBar'), 'fooBAR does not equal fooBar');
  assert.notOk(Str.titleCaseEquals('foobar', 'fooBar'), 'foobar does not equal fooBar');
  assert.notOk(Str.titleCaseEquals('fooBar', 'FOOBAR'), 'fooBar does not equal fooBAR');
});

QUnit.test('toLowerCase should make a string start with a lowercase letter', function(assert) {
  const foo = Str.toLowerCase('BAR');

  assert.ok(foo === 'bAR');
});