TL;DR: Elias Nogueira calls BS on in-memory databases and flimsy mocks, showing how they lead to flaky integration tests, snail-paced CI/CD pipelines and brittle dependencies in large-scale microservices—especially in digital banking. He zeroes in on the three toughest challenges you’ll face when your tests need to mirror real production environments.
The fix: swap out your “fake” stacks for Testcontainers to spin up real databases, use WireMock to virtualize external HTTP services, and rely on Awaitility to handle async timing issues. These tools together deliver fast, rock-solid tests that actually behave like your live system.
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