Exploring the Testing Hyperpyramid with Kotlin and http4k
summary
Claims include that tests can run an entire bank on a single developer workstation and that http4k (about a million downloads a month) plus Kotlin let teams build in‑memory, deterministic tests that cut out networking. The talk shows http4k service-as-function plus hexagonal design, fake adapters and an observability/events port, composes services into a single JVM (hundreds of MB), and produces generated sequence diagrams and dependency graphs on test runs and failures; version 5 adds the diagramming features.
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