Parallel test runs on Linux, macOS, and Windows..

Author: armi3

.travis.yml

@@ -14,7 +14,9 @@ matrix:
         - choco install python
         - python -m pip install --upgrade pip
       env: PATH=/c/Python37:/c/Python37/Scripts:$PATH
-install: pip3 install --upgrade pip  # all three OSes agree about 'pip3'
+install:
+  - pip3 install --upgrade pip  # all three OSes agree about 'pip3'
+  - pip install -r requirements.txt
 # 'python' points to Python 2.7 on macOS but points to Python 3.7 on Linux and Windows
 # 'python3' is a 'command not found' error on Windows but 'py' works on Windows only
 script: python3 website.py || python website.py