jest

Jest mock function not called as expected

Expected.*mock.*to have been called|not been called|toHaveBeenCalled

Fixes

1.Verify the mock is injected correctly — check the module path in jest.mock()
2.Ensure the code path that calls the function is actually reached
3.Use mockImplementation to trace when/if the mock gets invoked

jestmocksassertions

Related Errors

Jest assertion value mismatch

expect\(received\)\.toBe\(expected\)|Expected.*Received

•Check expected vs actual values — use .toEqual() for objects instead of .toBe()
•For floating point, use .toBeCloseTo() instead of exact equality

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()

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