test: add unit tests for typeof fix

- BrowserApi: verify isDocument() and isWindow() return true when globals exist
- randomUuidV4: verify fallback path when crypto.randomUUID is unavailable

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: joker23

packages/sdk/browser/__tests__/BrowserApi.test.ts

@@ -0,0 +1,9 @@
+import { isDocument, isWindow } from '../src/BrowserApi';
+
+it('isDocument returns true when document is defined', () => {
+  expect(isDocument()).toBe(true);
+});
+
+it('isWindow returns true when window is defined', () => {
+  expect(isWindow()).toBe(true);
+});

packages/sdk/browser/__tests__/platform/randomUuidV4.test.ts

@@ -1,5 +1,5 @@
 /* eslint-disable no-bitwise */
-import { fallbackUuidV4, formatDataAsUuidV4 } from '../../src/platform/randomUuidV4';
+import randomUuidV4, { fallbackUuidV4, formatDataAsUuidV4 } from '../../src/platform/randomUuidV4';
 
 it('formats conformant UUID', () => {
   // For this test we remove the random component and just inspect the variant and version.
@@ -27,3 +27,19 @@ it('formats conformant UUID', () => {
   expect(specifierB).toEqual(0x8);
   expect(specifierC).toEqual(0x8);
 });
+
+it('falls back when crypto.randomUUID is unavailable', () => {
+  const original = globalThis.crypto;
+  Object.defineProperty(globalThis, 'crypto', {
+    value: { getRandomValues: original.getRandomValues.bind(original) },
+    configurable: true,
+  });
+
+  try {
+    const uuid = randomUuidV4();
+    expect(uuid).toHaveLength(36);
+    expect(uuid[14]).toEqual('4');
+  } finally {
+    Object.defineProperty(globalThis, 'crypto', { value: original, configurable: true });
+  }
+});