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?"