Lucas and Luna explore contract testing as a solution to microservices integration failures. They break down how companies like Netflix and Uber use consumer-driven contract tests to catch breaking API changes before deployment, using real-world examples like a payment service that broke a checkout flow. The episode explains the difference between provider and consumer contracts, the tools (Pact, Spring Cloud Contract), and why contract testing reduces end-to-end test flakiness by up to 80 percent. No abstract theory—just actionable insights for QA teams drowning in integration test debt.

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