[AIRFLOW-3100][AIRFLOW-3101] Improve docker compose local testing (ap…

…ache#3933)

CONTRIBUTING.md

@@ -146,9 +146,18 @@ There are three ways to setup an Apache Airflow development environment.
   # From the container
   pip install -e .[devel]
   # Run all the tests with python and mysql through tox
+  pip install tox
   tox -e py35-backend_mysql
   ```
 
+  If you wish to run individual tests inside of docker enviroment you can do as follows:
+
+  ```bash
+    # From the container (with your desired enviroment) with druid hook
+    tox -e py35-backend_mysql -- tests/hooks/test_druid_hook.py
+ ```
+
+
 ### Running unit tests
 
 To run tests locally, once your unit test environment is setup (directly on your

scripts/ci/docker-compose.yml

@@ -67,6 +67,7 @@ services:
     init: true
     environment:
       - USER=airflow
+      - ADDITIONAL_PATH=~/.local/bin
       - SLUGIFY_USES_TEXT_UNIDECODE=yes
       - TOX_ENV
       - PYTHON_VERSION

scripts/ci/run-ci.sh

@@ -35,8 +35,8 @@ else
   PIP=pip2
 fi
 
-sudo $PIP install --upgrade pip
-sudo $PIP install tox
+sudo -H $PIP install --upgrade pip
+sudo -H $PIP install tox
 
 cd $AIRFLOW_ROOT && $PIP --version && tox --version