Add GitHub test workflow

.github/workflows/test.yml

@@ -0,0 +1,45 @@
+name: Test package
+
+on: [push, pull_request]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: [3.6, 3.7, 3.8, 3.9]
+
+    steps:
+    - uses: actions/checkout@v1
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v1
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+    - name: Install package
+      run: |
+        pip install -e .
+    - name: Check format with isort
+      run: |
+        pip install isort
+        isort -c openwifipass/**.py
+        isort -c tests/**.py
+    - name: Check format with black
+      run: |
+        pip install black
+        black . --check --diff
+    - name: Lint with flake8
+      run: |
+        pip install flake8
+        flake8 . --count --show-source --statistics
+    - name: Lint with pylint
+      run: |
+        pip install pylint
+        pylint --rcfile=setup.cfg openwifipass tests
+    - name: Test with pytest
+      run: |
+        pip install pytest
+        pytest