test(common/web): unit tests for element-string

[markcsinclair]

Unit tests for kmx/kmx-plus/element-string.ts

See #9052

@keymanapp-test-bot skip

[keymanapp-test-bot]

User Test Results

Test specification and instructions

User tests are not required

Test Artifacts

• Android
  • Keyman for Android apk
  • FirstVoices for Android 16.0 apk
  • FirstVoices Keyboards for Android apk
  • KeyboardHarness apk
  • Keyman for Android 16.0 apk
  • KMSample1 apk
  • KMSample2 apk
• Developer
  • Keyman Developer
  • Compiler Regression Tests
  • kmcomp.zip
• iOS
  • Keyman for iOS (simulator image)
  • FirstVoices Keyboards for iOS (simulator image)
  • TestFlight internal PR build version - 18.0.165 (0.12811.12519)
• Keyboards
  • Test Keyboards
• Web
  • KeymanWeb Test Home
• Windows
  • Keyman for Windows
  • FirstVoices Keyboards for Windows
  • Text Editor (32 bit)
  • Text Editor (64 bit)

[markcsinclair]

ElemElement.isEqual() and ElementStrings.isEqual() fail if they are tested with cloned StrsItems internally, as StrsItem lacks an isEqual() method that should then be used in ElemElement.isEqual().

  isEqual(a: StrsItem): boolean {
    return a.value === this.value && a.char === this.char;
  }

See issue #12867 and PR #12868

[markcsinclair]

Ready for review. Two fixes will be needed to cover the issues addressed by skipped tests.