Edits from review

Author: staticf0x

Diff for: CONTRIBUTING.md

@@ -3,18 +3,8 @@
 1. Clone the repo: `git clone [email protected]:python-lsp/python-lsp-server.git`
 2. Create the virtual environment: `python3 -m venv .venv`
 3. Activate: `source .venv/bin/activate`
-
-Create a helper script to run the server without the need to `pip3 install` it
-on every change and name it `run` or similar:
-
-```py
-#!/home/user/projects/python-lsp-server/.venv/bin/python
-import sys
-
-from pylsp.__main__ import main
-
-sys.exit(main())
-```
+4. Install an editable installation: `pip3 install -e .`
+    - This will ensure you'll see your edits immediately without reinstalling the project
 
 ## Configure your editor
 
@@ -63,5 +53,15 @@ Now the project is setup in a way you can quickly iterate change you want to add
 
 # Running tests
 
-1. Install dependencies: `pip3 install .[test]`
-2. Run `pytest`: `pytest -v`
+1. Install runtime dependencies: `pip3 install .[all]`
+2. Install test dependencies: `pip3 install .[test]`
+3. Run `pytest`: `pytest -v`
+
+## Useful pytest options
+
+- To run a specific test file, use `pytest test/test_utils.py`
+- To run a specific test function within a test file,
+  use `pytest test/test_utils.py::test_debounce`
+- To run tests matching a certain expression, use `pytest -k format`
+- To increase verbosity of pytest, use `pytest -v` or `pytest -vv`
+- To enter a debugger on failed tests, use `pytest --pdb`