ReadMeFeed / Community knowledge
Real questions. Useful conversations. Find the people who know your stack.
Frameworks & web · #karatelabs
Scale load tests automatically with Karat Labs. Learn how to define JSON scenarios, let Kubernetes autoscale workers, monitor real‑time metrics, and embed tests in CI pipelines.
Symptom When executing Karate tests that utilize the built‑in mock server, there is uncertainty about whether the mock endpoints are bound only to the intended interface (e.g., localhost) or could become reachable from external networks. The goal is to confirm that the mock service remains isolated to the test environment and to identify any configuration op
Karate Scenario Outlines driven by `read()` load entire CSV or JSON files into the heap before iteration begins. This design means a 100 kB test data file can trigger OutOfMemoryError under constrained -Xmx settings, and no public API exists for lazy row extraction or bounded iteration. The framework's pagination support for REST API responses requires manua
Integration testing often requires isolating the test suite from production credentials and live data. Karate provides the Netty server capability to simulate API dependencies via feature files, allowing developers to map requests to static or dynamic responses without hitting a live endpoint. While karate-config.js can switch base URLs between environments,
Goal: ensure deterministic test execution in a Docker‑based CI pipeline while still letting developers override specific values (e.g., base URL, credentials) locally without committing those overrides to the repository. Constraint: the team must decide whether karate-config.js should be treated as a pure function (no side‑effects) or whether limited side‑eff
Shared State Management in Karate The karate.callSingle() feature is used to execute a setup feature once per test run and reuse the resulting value across multiple features and parallel threads. By default, these results are retained for the duration of the run to optimize performance. While configure callSingleCache allows for the definition of a time-to-l
Karate.filter pagination inconsistency Goal: obtain reliable, non‑overlapping pages of a large JSON array when using karate.filter inside a parallel Scenario Outline. Constraints: the source array is loaded with karate.read , its length is not an exact multiple of the chosen page size, and the filter expression is reused across iterations. Uncertainty: obser
Karate-config.js environment bootstrap When a test suite is executed in a container or CI pipeline, the karate.env system property is often omitted. Karate’s karate-config.js script then falls back to the default branch defined in the file, typically pointing at a local or dev endpoint. The suite passes, but it is actually running against the wrong host. Loc
Suppressing noisy alerts while preserving logs In Karate, the alertHandler function is the documented way to control JavaScript alert() , confirm() , and prompt() dialogs during UI test runs. By default, an unexpected alert causes an AssertionError and prints the dialog text to the console, producing noisy output. The handler receives the dialog message and
kubernetes