Update test docs for OTel Demo (#3173)

content/en/docs/demo/tests.md

@@ -1,16 +1,25 @@
 ---
 title: Tests
+cSpell:ignore: Tracetest
 ---
 
 Currently, the repository includes E2E tests for both the frontend and backend
 services. For the Frontend we are using [Cypress](https://www.cypress.io/)
 execute the different flows in the web store. While the backend services use
-[AVA](https://avajs.dev) as the main testing framework.
+[AVA](https://avajs.dev) as the main testing framework for integration tests and
+[Tracetest](https://tracetest.io/) for trace-based tests.
 
-To run the test you can simply run `make run-tests` at the root directory.
+To run all the tests, execute `make run-tests` from the root directory.
 
-In case you need to run a specific suite of tests you can execute
-`docker compose run frontendTests`[^1] for the frontend tests or
-`docker compose run integrationTests`[^1] for the backend tests.
+Otherwise, if you want to run a specific suite of tests you can execute specific
+commands for each type of test[^1]:
+
+- **Frontend tests**: `docker compose run frontendTests`
+- **Backend tests**:
+  - Integration: `docker compose run integrationTests`
+  - Trace-based: `docker compose run traceBasedTests`
+
+To learn more about these tests, see
+[Service Testing](https://github.com/open-telemetry/opentelemetry-demo/tree/main/test).
 
 [^1]: {{% _param notes.docker-compose-v2 %}}

static/refcache.json

@@ -4471,6 +4471,10 @@
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