diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
new file mode 100644
index 00000000..27c44d59
--- /dev/null
+++ b/.github/workflows/tests.yml
@@ -0,0 +1,128 @@
+name: Tests
+
+on:
+
+  # On which repository actions to trigger the build.
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+  # Allow job to be triggered manually.
+  workflow_dispatch:
+
+# Cancel in-progress jobs when pushing to the same branch.
+concurrency:
+  cancel-in-progress: true
+  group: ${{ github.workflow }}-${{ github.ref }}
+
+jobs:
+
+  tests:
+
+    runs-on: ${{ matrix.os }}
+    strategy:
+
+      # Run all jobs to completion (false), or cancel
+      # all jobs once the first one fails (true).
+      fail-fast: true
+
+      matrix:
+        os: [
+          "ubuntu-latest",
+          # "macos-latest",
+          # "windows-latest",
+        ]
+        python-version: [
+          "3.6", "3.7", "3.8", "3.9", "3.10", "3.11-dev",
+          "pypy3.6", "pypy3.7", "pypy3.8", "pypy3.9",
+        ]
+        bare: [false]
+
+        # Add another single item to the test matrix. It is the `bare` environment,
+        # where `all-plugin-requirements.txt` will NOT be installed, in order to
+        # verify the application also works well without those optional dependencies.
+        include:
+          - os: "ubuntu-latest"
+            python-version: "3.10"
+            bare: true
+
+    env:
+      OS: ${{ matrix.os }}
+      PYTHON: ${{ matrix.python-version }}
+      BARE: ${{ matrix.bare }}
+
+    name: Python ${{ matrix.python-version }} on ${{ matrix.os }} (bare=${{ matrix.bare }})
+    steps:
+
+    - name: Acquire sources
+      uses: actions/checkout@v3
+
+    - name: Install prerequisites (Linux)
+      if: runner.os == 'Linux'
+      run: |
+        sudo apt-get install libdbus-1-dev
+
+    - name: Setup Python
+      uses: actions/setup-python@v4
+      with:
+        python-version: ${{ matrix.python-version }}
+        architecture: x64
+        cache: 'pip'
+        cache-dependency-path: |
+          setup.py
+          requirements.txt
+          dev-requirements.txt
+          all-plugin-requirements.txt
+          win-requirements.txt
+
+    - name: Install project dependencies (Baseline)
+      run: |
+        pip install wheel
+        pip install -r requirements.txt -r dev-requirements.txt
+
+    - name: Install project dependencies (All plugins)
+      if: matrix.bare != true
+      run: |
+        pip install -r all-plugin-requirements.txt
+        
+        # Installing `dbus-python` will croak on PyPy, so skip it.
+        [[ $PYTHON != 'pypy'* ]] && pip install dbus-python || true
+
+    - name: Install project dependencies (Windows)
+      if: runner.os == 'Windows'
+      run: |
+        pip install -r win-requirements.txt
+
+    # Install package in editable mode,
+    # and run project-specific tasks.
+    - name: Setup project
+      run: |
+        pip install --editable=.
+        python setup.py compile_catalog
+
+    # For saving resources, code style checking is
+    # only invoked within the `bare` environment.
+    - name: Check code style
+      if: matrix.bare == true
+      run: |
+        flake8 . --count --show-source --statistics
+
+    - name: Run tests
+      run: |
+        coverage run -m pytest
+
+    - name: Process coverage data
+      run: |
+        coverage combine
+        coverage xml
+        coverage report
+
+    - name: Upload coverage data
+      uses: codecov/codecov-action@v3
+      with:
+        files: ./coverage.xml
+        flags: unittests
+        env_vars: OS,PYTHON,BARE
+        name: codecov-umbrella
+        fail_ci_if_error: false
diff --git a/test/test_plugin_msteams.py b/test/test_plugin_msteams.py
index daddc9d8..8d2d5857 100644
--- a/test/test_plugin_msteams.py
+++ b/test/test_plugin_msteams.py
@@ -175,6 +175,9 @@ def test_plugin_msteams_urls():
     AppriseURLTester(tests=apprise_url_tests).run_all()
 
 
+@pytest.mark.skipif(
+    hasattr(sys, "pypy_version_info") and sys.version_info < (3, 7),
+    reason="Does not work or is flaky on PyPy 3.6")
 @mock.patch('requests.post')
 def test_plugin_msteams_templating(mock_post, tmpdir):
     """
diff --git a/test/test_plugin_twitter.py b/test/test_plugin_twitter.py
index a7da9f31..9959124d 100644
--- a/test/test_plugin_twitter.py
+++ b/test/test_plugin_twitter.py
@@ -24,6 +24,7 @@
 # THE SOFTWARE.
 
 import os
+import sys
 from unittest import mock
 
 import pytest
@@ -418,6 +419,9 @@ def test_plugin_twitter_edge_cases():
             targets='%G@rB@g3')
 
 
+@pytest.mark.skipif(
+    hasattr(sys, "pypy_version_info") and sys.version_info < (3, 7),
+    reason="Does not work or is flaky on PyPy 3.6")
 @mock.patch('requests.post')
 @mock.patch('requests.get')
 def test_plugin_twitter_dm_attachments(mock_get, mock_post):