LearnWithShobhan

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Testing

2 tutorials tagged Testing.

AWS & Serverless

Jest spyOn and mockImplementation for AWS Lambda tests: mock DynamoDB and S3 in beforeEach

Test a Lambda handler without touching AWS. Use jest.spyOn on a class prototype, mockImplementation in beforeEach, restore mocks, assert calls, and write one real integration test for the database class.

12 Nov 2026 · AWS · Lambda · Jest

AWS & Serverless

Test-driven development for AWS Lambda with Jest: mocks and spies explained

Stop deploying to test. Write Lambda handlers test-first with Jest: the TDD loop, a to-do list per function, mocking the database with jest.spyOn and mockImplementation, and validating input with Zod. Real tests from the VidShare course.

10 Nov 2026 · AWS · Lambda · Jest

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