skip tests when the backend to test is unavailable

Author: ChiahsinChu

source/tests/consistent/model/test_dipole.py

@@ -206,6 +206,10 @@ def extract_ret(self, ret: Any, backend) -> tuple[np.ndarray, ...]:
         raise ValueError(f"Unknown backend: {backend}")
 
     def test_atom_exclude_types(self):
+        if self.skip_pt:
+            self.skipTest("Unsupported backend")
+        if self.skip_tf:
+            self.skipTest("Unsupported backend")
         _ret, data = self.get_reference_ret_serialization(self.RefBackend.PT)
         data["atom_exclude_types"] = [1]
         self.reset_unique_id()

source/tests/consistent/model/test_polar.py

@@ -200,6 +200,10 @@ def extract_ret(self, ret: Any, backend) -> tuple[np.ndarray, ...]:
         raise ValueError(f"Unknown backend: {backend}")
 
     def test_atom_exclude_types(self):
+        if self.skip_pt:
+            self.skipTest("Unsupported backend")
+        if self.skip_tf:
+            self.skipTest("Unsupported backend")
         _ret, data = self.get_reference_ret_serialization(self.RefBackend.PT)
         data["atom_exclude_types"] = [1]
         self.reset_unique_id()