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Logs and Environment Variables
7.1Reading LogsLogs are your primary debugging tool when tests fail in CI or on remote servers. You cannot set breakpoints in a CI runner. You cannot open…7.2Log Analysis CommandsMany modern applications log in JSON format. Use jq to parse them:7.3Common Log Patterns to Search For7.4Environment VariablesEnvironment variables configure tests for different environments without changing code. They are the standard way to manage configuration…7.5Quick Reference: Essential Commands7.6Putting It All Together: Debug WorkflowWhen a test fails in CI, here is a systematic approach using command-line tools:7.7Hands-On Exercise1. Find and read the last 50 lines of an application log file on your system 2. Use jq to parse a JSON log file and extract only…