diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
new file mode 100644
index 0000000..05fdeb9
--- /dev/null
+++ b/.github/workflows/tests.yml
@@ -0,0 +1,44 @@
+name: Tests
+
+on:
+  push:
+    branches: [ master, develop ]
+  pull_request:
+    branches: [ master, develop ]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ["3.9", "3.10", "3.11", "3.12"]
+
+    steps:
+    - uses: actions/checkout@v3
+
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v4
+      with:
+        python-version: ${{ matrix.python-version }}
+
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install -e .
+        pip install pytest pytest-cov pytest-testmon
+
+    - name: Run tests (optimized with testmon)
+      run: |
+        pytest umap/tests/ -v --cov=umap --cov-report=xml --testmon
+      continue-on-error: true
+
+    - name: Run full test suite if optimized run failed
+      if: failure()
+      run: |
+        pytest umap/tests/ -v --cov=umap --cov-report=xml
+
+    - name: Upload coverage to Codecov
+      uses: codecov/codecov-action@v3
+      with:
+        files: ./coverage.xml
+        fail_ci_if_error: false
diff --git a/pyproject.toml b/pyproject.toml
index bbaf975..b3268c7 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -59,7 +59,7 @@ plot = [
 ]
 parametric_umap = ["tensorflow >= 2.1"]
 tbb = ["tbb >= 2019.0"]
-test = ["pytest"]
+test = ["pytest", "pytest-testmon", "pytest-watch"]
 
 [tool.setuptools]
 packages = ["umap"]