Continuous TDD with pytest in Python using NPM and Nodemon

package.json

{
  "name": "pytest-nodemon-watch",
  "version": "1.0.0",
  "license": "MIT",
  "scripts": {
    "test": "pytest",
    "test:watch": "nodemon --exec \"pytest\" *.py"
  },
  "nodemonConfig": {
    "ignore": [
      "env/*",
      "docs/*",
      "__pycache__/*"
    ]
  },
  "devDependencies": {
    "nodemon": "^1.12.1"
  }
}

Put this in the main folder of your Python project and run these commands

$ yarn install
$ yarn test:watch

Now your tests are run whenever a file in your working directory changes.