jest
Jest assertion value mismatch
expect\(received\)\.toBe\(expected\)|Expected.*Received
Fixes
- 1.Check expected vs actual values — use .toEqual() for objects instead of .toBe()
- 2.For floating point, use .toBeCloseTo() instead of exact equality
- 3.Verify test setup provides the expected data/mock state
jestassertionstesting
Related Errors
jest3 fixes
Jest mock function not called as expected
Expected.*mock.*to have been called|not been called|toHaveBeenCalled
- •Verify the mock is injected correctly — check the module path in jest.mock()
- •Ensure the code path that calls the function is actually reached
jest3 fixes
Jest async test timeout
Exceeded timeout.*Async callback|exceeded.*5000.*ms|jest.*timeout
- •Ensure async functions resolve: await the promise or call done()
- •Increase timeout: jest.setTimeout(10000) or third arg to it()
jest3 fixes
Jest snapshot mismatch
Snapshot.*does not match|toMatchSnapshot.*failed|1 snapshot.*failed
- •Review the diff — if change is intentional, update with: jest --updateSnapshot
- •Avoid snapshots of timestamps, random IDs, or unstable output