Add mock Claude client support for E2E testing#12220
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Introduces a testing framework for Claude integration that allows Playwright tests to run with deterministic, pre-recorded Claude interactions instead of the real Claude CLI. This enables reliable, fast E2E testing of permission flows and user interactions without requiring an actual Claude API connection. Key components: - Mock scenario loader (mock_scenario.rs) that reads session snapshots from JSON files and creates mock transports for the Claude Agent SDK - Three initial test scenarios covering common permission flows: * permission-bash-echo.json - Basic Bash tool approval * permission-wildcard-test.json - Wildcard permission scoping * ask-user-question.json - AskUserQuestion tool interaction - Integration in session.rs via `testing` feature flag and CLAUDE_MOCK_SCENARIO environment variable - E2E test suite (claudePermissions.spec.ts) demonstrating permission approval UI interactions - Improved test stability with process cleanup and RUST_LOG passthrough The mock scenarios use the SDK's SessionSnapshot format and handle permission callback timing automatically - when a control_request appears in the scenario, subsequent messages are held until the SDK responds with control_response. Each test specifies its own scenario by passing CLAUDE_MOCK_SCENARIO to startGitButler(), which spawns a fresh but-server process with that env var.
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Introduces a testing framework for Claude integration that allows Playwright
tests to run with deterministic, pre-recorded Claude interactions instead of
the real Claude CLI. This enables reliable, fast E2E testing of permission
flows and user interactions without requiring an actual Claude API connection.
Key components:
JSON files and creates mock transports for the Claude Agent SDK
testingfeature flag and CLAUDE_MOCK_SCENARIOenvironment variable
UI interactions
The mock scenarios use the SDK's SessionSnapshot format and handle permission
callback timing automatically - when a control_request appears in the scenario,
subsequent messages are held until the SDK responds with control_response.
Each test specifies its own scenario by passing CLAUDE_MOCK_SCENARIO to
startGitButler(), which spawns a fresh but-server process with that env
var.
This is part 2 of 2 in a stack made with GitButler: