test: fix flaky sleep test (#571)

src/shared/util/tests/time.test.ts

@@ -3,11 +3,13 @@ import { describe, expect, it } from 'vitest';
 
 describe('sleep', () => {
     it('should resolve after the specified number of milliseconds', async () => {
-        const start = Date.now();
+        const start = performance.now();
         const milliseconds = 1000;
         await sleep(milliseconds);
-        const end = Date.now();
+        const end = performance.now();
         const elapsed = end - start;
-        expect(elapsed).toBeGreaterThanOrEqual(milliseconds);
+        // Flaky test due to JS's lack of precision in setTimeout,
+        // so we allow for a 1ms difference
+        expect(elapsed).toBeGreaterThanOrEqual(milliseconds - 1);
     });
 });