Prefer Consumer over Integration Tests
Recently I attended an RCA meeting for an incident that happened in prod few weeks back. The issue was somewhat of a 2nd degree failure. To put it in simple terms, lets say a workflow composed of two services - A and B. When user performed an action from the UI, it made a call to Service A which then internally called service B with some parameters based on user preferences. In this case, due to some unusual combination of preferences, Service-A ended making call to Service-B with parameters that Service-B didn’t fully understood. Solution - Write an integration test to cover this scenario. Reasoning - Since this involved 3 different components (User Preferences, Service A and Service B), it should be covered by an integration test. More Reasoning: This is sort of the usual way of thinking about the integration tests - meaning whenever there are multiple services involved, we immediately think about writing an integration test. But is this the right approach specially in microserv