github: remove test-requirements.txt

README.md

@@ -192,7 +192,13 @@ pip install "path_to_this_repo[option,...]"
 
 ### Running tests
 
-From the root directory, run:
+Make sure you have all the dependencies installed:
+
+```shell
+pip install --editable ".[all]"
+```
+
+Then, from the root directory, run:
 
 ```shell
 pytest --doctest-modules --ignore-glob="*to_be_updated*" --ignore-glob=*pipeline_source* src tests