[Init] Initial commit - NetMesh terminal manager

infrastructure/config/uiFonts.test.ts

@@ -0,0 +1,82 @@
+import { describe, it } from 'node:test';
+import assert from 'node:assert/strict';
+import {
+  DEFAULT_UI_FONT_ID,
+  detectUiPlatform,
+  UI_FONTS,
+  withWindowsEmojiFallback,
+  WINDOWS_FLAG_EMOJI_FONT,
+  WINDOWS_UI_EMOJI_FONTS,
+  withUiCjkFallback,
+} from './uiFonts';
+
+describe('detectUiPlatform', () => {
+  it('detects Windows user agents', () => {
+    assert.equal(
+      detectUiPlatform('Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36'),
+      'win32',
+    );
+  });
+
+  it('detects macOS user agents', () => {
+    assert.equal(
+      detectUiPlatform('Mozilla/5.0 (Macintosh; Intel Mac OS X 14_0) AppleWebKit/537.36'),
+      'darwin',
+    );
+  });
+
+  it('falls back to linux for other platforms', () => {
+    assert.equal(
+      detectUiPlatform('Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36'),
+      'linux',
+    );
+  });
+});
+
+describe('withWindowsEmojiFallback', () => {
+  const sampleFamily = '"Space Grotesk", system-ui, sans-serif';
+
+  it('prepends bundled flag font and Windows emoji fonts for host labels', () => {
+    const stack = withWindowsEmojiFallback(sampleFamily, 'win32');
+    assert.ok(stack.startsWith(WINDOWS_UI_EMOJI_FONTS));
+    assert.match(stack, /Noto Color Emoji Flags/);
+    assert.match(stack, /Space Grotesk/);
+  });
+
+  it('includes the bundled flag font before Segoe UI Emoji on Windows', () => {
+    const stack = withWindowsEmojiFallback(sampleFamily, 'win32');
+    const flagIndex = stack.indexOf(WINDOWS_FLAG_EMOJI_FONT);
+    const segoeIndex = stack.indexOf('Segoe UI Emoji');
+    assert.ok(flagIndex >= 0);
+    assert.ok(segoeIndex >= 0);
+    assert.ok(flagIndex < segoeIndex);
+  });
+
+  it('keeps the stack unchanged on non-Windows platforms', () => {
+    assert.equal(withWindowsEmojiFallback(sampleFamily, 'darwin'), sampleFamily);
+    assert.equal(withWindowsEmojiFallback(sampleFamily, 'linux'), sampleFamily);
+  });
+
+  it('does not double-prepend when emoji fonts are already present', () => {
+    const alreadyPrefixed = `${WINDOWS_UI_EMOJI_FONTS}, ${sampleFamily}`;
+    assert.equal(withWindowsEmojiFallback(alreadyPrefixed, 'win32'), alreadyPrefixed);
+  });
+});
+
+describe('withUiCjkFallback', () => {
+  it('still appends CJK fallbacks for UI font stacks', () => {
+    const stack = withUiCjkFallback('"Space Grotesk", system-ui');
+    assert.match(stack, /PingFang SC/);
+    assert.match(stack, /Space Grotesk/);
+  });
+});
+
+describe('default UI font', () => {
+  it('uses Mona Sans while keeping Chinese fallbacks in the stack', () => {
+    const defaultFont = UI_FONTS.find((font) => font.id === DEFAULT_UI_FONT_ID);
+    assert.equal(DEFAULT_UI_FONT_ID, 'mona-sans');
+    assert.equal(defaultFont?.name, 'Mona Sans');
+    assert.match(defaultFont?.family ?? '', /Mona Sans/);
+    assert.match(defaultFont?.family ?? '', /PingFang SC/);
+  });
+});