Verify assertions properly

Ensure test assertions correctly validate the intended behavior by:

1. Awaiting promise assertions when testing async code: ```javascript // PROBLEMATIC: Test may pass even if promise never resolves expect(promise).resolves.toBe(expectedValue);

// CORRECT: Properly wait for and validate promise resolution await expect(promise).resolves.toBe(expectedValue); // OR return expect(promise).resolves.toBe(expectedValue);

2. **Comparing appropriate values** when testing transformations:
```javascript
// PROBLEMATIC: Comparing decompressed output to compressed input
expect(decompressedBuffer).toEqual(compressedBuffer);

// CORRECT: Verifying the transformation worked as expected
expect(decompressedBuffer.toString()).toEqual(originalInputString);

Understanding your testing framework’s behavior is important - some frameworks may handle certain assertions differently (e.g., in some environments expect(...).resolves might implicitly await).

Tests should validate that functions behave as expected, not just that they run without errors. Always ask: “Is this assertion actually testing what I intend to test?”