launchdarkly-testing

Overview

LaunchDarkly's server-side SDK exposes a TestData data source that lets tests configure flag values without any network call - the canonical hermetic-test pattern. Per launchdarkly.com/docs/sdk, TestData replaces the production data source; everything else about the SDK (variation evaluation, targeting rules, default handling) runs the real code paths.

When to use

• Unit / integration tests for code that calls client.variation() / client.boolVariation().
• Tests asserting on targeting-rule behaviour (segment matching, percentage rollout).
• Assignment-integrity tests per ab-test-validity-checklist.