Back to Repositories

Testing PDF.js Character Type Detection System in Mozilla PDF.js

This test suite validates character type detection functionality in Mozilla’s PDF.js library, focusing on accurate classification of different character sets including alphabets, spaces, punctuation marks, and various Unicode characters.

Test Coverage Overview

The test suite provides comprehensive coverage of character type detection across multiple character sets and encoding types.

Tests various ASCII characters including uppercase, lowercase, and numbers
Validates special characters and whitespace handling
Covers international character sets including Thai, Han, Katakana, and Hiragana
Tests Unicode character classification

Implementation Analysis

The implementation uses a Jest-style testing approach with describe/it blocks for organized test structure.

Utilizes object mapping for test case organization
Implements character code conversion for testing
Uses expect assertions for verification
Employs systematic character type enumeration

Technical Details

Testing Framework: Jest-compatible syntax
Character Processing: Uses charCodeAt() for character code extraction
Import System: ES6 module imports
Test Organization: Nested describe blocks
Assertion Style: expect().toEqual() matcher

Best Practices Demonstrated

The test suite demonstrates excellent testing practices for character processing validation.

Comprehensive character set coverage
Clear test case organization
Systematic enumeration of test cases
Proper Unicode handling
Efficient test case mapping

mozilla/pdfJs

test/unit/pdf_find_utils_spec.js

            
/* Copyright 2018 Mozilla Foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import { CharacterType, getCharacterType } from "../../web/pdf_find_utils.js";

describe("pdf_find_utils", function () {
  describe("getCharacterType", function () {
    it("gets expected character types", function () {
      const characters = {
        A: CharacterType.ALPHA_LETTER,
        a: CharacterType.ALPHA_LETTER,
        0: CharacterType.ALPHA_LETTER,
        5: CharacterType.ALPHA_LETTER,
        "\xC4": CharacterType.ALPHA_LETTER, // "Ä"
        "\xE4": CharacterType.ALPHA_LETTER, // "ä"
        _: CharacterType.ALPHA_LETTER,
        " ": CharacterType.SPACE,
        "\t": CharacterType.SPACE,
        "\r": CharacterType.SPACE,
        "\n": CharacterType.SPACE,
        "\xA0": CharacterType.SPACE, // nbsp
        "-": CharacterType.PUNCT,
        ",": CharacterType.PUNCT,
        ".": CharacterType.PUNCT,
        ";": CharacterType.PUNCT,
        ":": CharacterType.PUNCT,
        "\u2122": CharacterType.ALPHA_LETTER, // trademark
        "\u0E25": CharacterType.THAI_LETTER,
        "\u4000": CharacterType.HAN_LETTER,
        "\uF950": CharacterType.HAN_LETTER,
        "\u30C0": CharacterType.KATAKANA_LETTER,
        "\u3050": CharacterType.HIRAGANA_LETTER,
        "\uFF80": CharacterType.HALFWIDTH_KATAKANA_LETTER,
      };

      for (const character in characters) {
        const charCode = character.charCodeAt(0);
        const type = characters[character];

        expect(getCharacterType(charCode)).toEqual(type);
      }
    });
  });
});