EchoLab Example App

EchoLab is a tiny OTP application whose test suite exercises every Supertester feature end to end. It is intentionally small so the tests stay focused on Supertester itself rather than app logic.

What This Example Covers

The EchoLab test suite demonstrates:

• Supertester.ExUnitFoundation isolation, tags, telemetry/log/ETS extensions
• Supertester.UnifiedTestFoundation API (including contamination detection)
• Supertester.Env custom environment module
• Supertester.TestableGenServer sync handler injection
• Supertester.OTPHelpers for isolated GenServers and supervisors
• Supertester.GenServerHelpers for state access, sync casts, concurrency, and recovery
• Supertester.SupervisorHelpers for restart strategy checks and tree validation
• Supertester.Assertions for OTP-aware assertions and leak checks
• Supertester.PerformanceHelpers for performance and mailbox monitoring
• Supertester.ChaosHelpers for crash injection and chaos suites
• Supertester.ConcurrentHarness and Supertester.PropertyHelpers
• Supertester.MessageHarness for mailbox tracing
• Supertester.Telemetry and Supertester.TelemetryHelpers
• Supertester.LoggerIsolation and Supertester.ETSIsolation

Running the Tests

cd examples/echo_lab
mix deps.get
mix test

Layout

• lib/ contains a small counter, workers, supervisors, and ETS helpers.
• test/ contains focused tests that map directly to Supertester modules.
• test/support/ contains the TestableCounter used by sync and harness examples.