chrome-devtools-frontend/front_end/core/common/CharacterIdMap.test.ts

Chrome DevTools UI

// Copyright 2019 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import * as Common from './common.js';

const CharacterIdMap = Common.CharacterIdMap.CharacterIdMap;

describe('CharacterIdMap class', () => {
  it('is able to convert an element to a character', () => {
    const testElement = document.createElement('p');
    const characterIdMap = new CharacterIdMap();
    assert.strictEqual(characterIdMap.toChar(testElement), '!', 'element was not converted correctly');
  });

  it('is able to convert a character to an element', () => {
    const testElement = document.createElement('p');
    const characterIdMap = new CharacterIdMap();
    assert.strictEqual(characterIdMap.toChar(testElement), '!', 'element was not converted correctly');
    assert.strictEqual(characterIdMap.fromChar('!'), testElement, 'character was not converted correctly');
  });

  it('returns the same character when trying to convert an element that was already converted', () => {
    const testElement = document.createElement('p');
    const characterIdMap = new CharacterIdMap();
    assert.strictEqual(characterIdMap.toChar(testElement), '!', 'element was not converted correctly');
    assert.strictEqual(characterIdMap.toChar(testElement), '!', 'element was not converted correctly');
  });

  it('throws an error when trying to convert a number when there is no capacity left', () => {
    const upperLimit = 0xFFFF;
    const characterIdMap = new CharacterIdMap();
    assert.throws(() => {
      for (let index = 0; index <= upperLimit; index++) {
        const el = document.createElement('div');
        el.setAttribute('id', 'Div' + index);
        characterIdMap.toChar(el);
      }
    }, 'CharacterIdMap ran out of capacity!');
  });

  it('returns null when trying to convert  a character that does not exist in the Map', () => {
    const characterIdMap = new CharacterIdMap();
    assert.isNull(characterIdMap.fromChar('!'), 'character was not converted correctly');
  });
});