Replace travis with GitHub action

.github/workflows/ci_tests.yaml

@@ -0,0 +1,38 @@
+name: CI
+
+on:
+  push:
+  pull_request:
+  schedule:
+    # run every Monday at 6am UTC
+    - cron: '0 6 * * 1'
+
+jobs:
+  ci-tests:
+    runs-on: 'ubuntu-latest'
+    steps:
+    - name: Check out repository
+      uses: actions/checkout@v2
+    - name: Set up Python ${{ matrix.python }}
+      uses: actions/setup-python@v2
+      with:
+        python-version: 3.9
+    - name: Install base dependencies
+      run: |
+        python -m pip install --upgrade pip
+        python -m pip install pytest wheel jupyterlab
+    - name: Install the package
+      run: |
+        pip install .
+    - name: Check notebook extension installation
+      run: |
+        jupyter nbextension list | grep ipyevents
+    - name: Check labextension is installed
+      run: |
+        jupyter labextension list
+        $(jupyter labextension list | grep ipyevents > ipyevents_lines.txt) || echo
+        test ! -s ipyevents_lines.txt
+    - name: Run unit ci-tests
+      run: |
+        pytest ipyevents
+