update the README

e2e_tests/README.md

@@ -2,8 +2,28 @@
 
 E2E tests are run in the `e2e-tests` workflow in `.github/workflows/e2e-tests.yml`.
 
-They are written such that a `run.sh` script can be executed to run some number of tests locally.
+Each folder in this directory contains a Python package representing a set of tests for a simple scenario.
 
-Each folder in this directory represents a set of tests for simple scenarios.
+When new folders are added, they will be executed automatically in the CI/CD pipeline by `pytest`.
 
-When new folders are added, they will be executed automatically in the CI/CD pipeline, assuming the `run.sh` script runs successfully.
+To run all the tests:
+
+```sh
+$ poetry run pytest -m"e2e"
+```
+or
+```sh
+$ poetry run pytest ./e2e_tests
+```
+
+To run a specific scenario:
+
+```sh
+$ poetry run pytest e2e_tests/basic_streaming
+```
+
+If you want to see the output of the different services running, pass the `-s` flag to pytest:
+
+```sh
+$ poetry run pytest e2e_tests/basic_streaming -s
+```