only test action added

.github/workflows/only_test.yml

@@ -0,0 +1,63 @@
+name: Only tests
+on:
+  push:
+    branches:
+      - main
+      - main
+    tags:
+      - "v*" # Push events to matching v*, i.e. v1.0, v20.15.10
+  pull_request:
+    branches:
+      - main
+      - main
+
+jobs:
+  test:
+    name: ${{ matrix.platform }} py${{ matrix.python-version }}
+    runs-on: ${{ matrix.platform }}
+    strategy:
+      matrix:
+        platform: [ubuntu-latest, windows-latest, macos-latest]
+        python-version: [3.7, 3.8, 3.9]
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v2
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      # these libraries, along with pytest-xvfb (added in the `deps` in tox.ini),
+      # enable testing on Qt on linux
+      - name: Install Linux libraries
+        if: runner.os == 'Linux'
+        run: |
+          sudo apt-get install -y libdbus-1-3 libxkbcommon-x11-0 libxcb-icccm4 \
+            libxcb-image0 libxcb-keysyms1 libxcb-randr0 libxcb-render-util0 \
+            libxcb-xinerama0 libxcb-xinput0 libxcb-xfixes0
+
+      # strategy borrowed from vispy for installing opengl libs on windows
+      - name: Install Windows OpenGL
+        if: runner.os == 'Windows'
+        run: |
+          git clone --depth 1 git://github.com/pyvista/gl-ci-helpers.git
+          powershell gl-ci-helpers/appveyor/install_opengl.ps1
+
+      # note: if you need dependencies from conda, considering using
+      # setup-miniconda: https://github.com/conda-incubator/setup-miniconda
+      # and
+      # tox-conda: https://github.com/tox-dev/tox-conda
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install setuptools tox tox-gh-actions
+
+      # this runs the platform-specific tests declared in tox.ini
+      - name: Test with tox
+        run: tox
+        env:
+          PLATFORM: ${{ matrix.platform }}
+
+      - name: Coverage
+        uses: codecov/codecov-action@v1