Added tests

.github/workflows/linter.yml

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+name: Linter
+
+on:
+  push:
+    branches:
+      - master
+      - 'dev-**'
+  pull_request:
+    branches:
+      - master
+      - 'dev-**'
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up Python
+        uses: actions/setup-python@v1
+        with:
+          python-version: 3.6
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          python -m pip install flake8
+      - name: Check flake8
+        run: python -m flake8 . --count --show-source --statistics --append-config .flake8

.github/workflows/tests.yml

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+name: Tests
+
+on:
+  push:
+    branches:
+      - main
+      - 'dev-**'
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up Python
+        uses: actions/setup-python@v2
+        with:
+          python-version: 3.6
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          python -m pip install -r requirements.txt
+      - name: Run tests
+        run: |
+          export QT_QPA_PLATFORM=offscreen
+          python -m unittest discover tests
+      - name: Checking package installation
+        run: python setup.py install