TDD with python, pytest and vim

Setting up

Getting Started• pip install pytest• pip install pytest-xdist

• If you are using Anaconda, pytest should already be installed

Directory/Folder structure

Create a tests folder in your project directory

Test data for testing dataframes

Name corresponding test files with a test_ infront

Using VIM• Open vim <filename> in the root directory• Enter :vsplit <tests/filename> in vim’s console• You will get a split window.• Ctrl-wx to swap columns in the order of preference. I.e. code on left,

test on right or vice versa• Ctrl-ww to switch editing columns

Using VIM - vsplit

CODE TESTS

Using VIM – vsplitCursorHere shows where you are editing

code testsCtrl-ww

Pytest• Run pytest -f -v in

the root of your project directory• Pytest will be

watching for any changes in the code or tests.• Once you save either

file, it will re-run all tests automatically