Emoji Rendering Efficiency (#35568)

app/javascript/mastodon/features/emoji/utils.test.ts

@@ -1,8 +1,14 @@
-import { stringHasUnicodeEmoji, stringHasUnicodeFlags } from './utils';
+import {
+  stringHasAnyEmoji,
+  stringHasCustomEmoji,
+  stringHasUnicodeEmoji,
+  stringHasUnicodeFlags,
+} from './utils';
 
-describe('stringHasEmoji', () => {
+describe('stringHasUnicodeEmoji', () => {
   test.concurrent.for([
     ['only text', false],
+    ['text with non-emoji symbols ™©', false],
     ['text with emoji 😀', true],
     ['multiple emojis 😀😃😄', true],
     ['emoji with skin tone 👍🏽', true],
@@ -19,14 +25,14 @@ describe('stringHasEmoji', () => {
     ['emoji with enclosing keycap #️⃣', true],
     ['emoji with no visible glyph \u200D', false],
   ] as const)(
-    'stringHasEmoji has emojis in "%s": %o',
+    'stringHasUnicodeEmoji has emojis in "%s": %o',
     ([text, expected], { expect }) => {
       expect(stringHasUnicodeEmoji(text)).toBe(expected);
     },
   );
 });
 
-describe('stringHasFlags', () => {
+describe('stringHasUnicodeFlags', () => {
   test.concurrent.for([
     ['EU 🇪🇺', true],
     ['Germany 🇩🇪', true],
@@ -45,3 +51,27 @@ describe('stringHasFlags', () => {
     },
   );
 });
+
+describe('stringHasCustomEmoji', () => {
+  test('string with custom emoji returns true', () => {
+    expect(stringHasCustomEmoji(':custom: :test:')).toBeTruthy();
+  });
+  test('string without custom emoji returns false', () => {
+    expect(stringHasCustomEmoji('🏳️‍🌈 :🏳️‍🌈: text ™')).toBeFalsy();
+  });
+});
+
+describe('stringHasAnyEmoji', () => {
+  test('string without any emoji or characters', () => {
+    expect(stringHasAnyEmoji('normal text. 12356?!')).toBeFalsy();
+  });
+  test('string with non-emoji characters', () => {
+    expect(stringHasAnyEmoji('™©')).toBeFalsy();
+  });
+  test('has unicode emoji', () => {
+    expect(stringHasAnyEmoji('🏳️‍🌈🔥🇸🇹 👩‍🔬')).toBeTruthy();
+  });
+  test('has custom emoji', () => {
+    expect(stringHasAnyEmoji(':test: :custom:')).toBeTruthy();
+  });
+});