add test-backend-case-distinction to workflow

.github/workflows/tests.yml

@@ -29,6 +29,7 @@ jobs:
           environment-file: environment.yaml
           python-version: ${{ matrix.python-version }}
           auto-activate-base: false
+          use-mamba: true
 
       - name: Install JAX
         if: ${{ matrix.backend == 'jax' }}
@@ -59,6 +60,22 @@ jobs:
           conda config --show
           printenv | sort
 
-      - name: Run tests
+      - name: Run JAX Tests
+        if: ${{ matrix.backend == 'jax' }}
+        run: |
+          python -m pytest tests/ -n auto -v -m "not (numpy or tensorflow or torch)"
+
+      - name: Run NumPy Tests
+        if: ${{ matrix.backend == 'numpy' }}
+        run: |
+          python -m pytest tests/ -n auto -v -m "not (jax or tensorflow or torch)"
+
+      - name: Run TensorFlow Tests
+        if: ${{ matrix.backend == 'tensorflow' }}
+        run: |
+          python -m pytest tests/ -n auto -v -m "not (jax or numpy or torch)"
+
+      - name: Run PyTorch Tests
+        if: ${{ matrix.backend == 'torch' }}
         run: |
-          python -m pytest tests/ -n auto -v
+          python -m pytest tests/ -n auto -v -m "not (jax or numpy or tensorflow)"