CoreSWHID: add to_qualified method

swh/model/swhids.py

@@ -197,6 +197,17 @@ class CoreSWHID(_BaseSWHID[ObjectType]):
             object_id=self.object_id,
         )
 
+    def to_qualified(self) -> QualifiedSWHID:
+        """Converts this CoreSWHID into a QualifiedSWHID.
+
+        As QualifiedSWHID is a superset of CoreSWHID, this is lossless."""
+        return QualifiedSWHID(
+            namespace=self.namespace,
+            scheme_version=self.scheme_version,
+            object_type=self.object_type,
+            object_id=self.object_id,
+        )
+
 
 def _parse_core_swhid(swhid: Union[str, CoreSWHID, None]) -> Optional[CoreSWHID]:
     if swhid is None or isinstance(swhid, CoreSWHID):

swh/model/tests/test_swhids.py

@@ -257,6 +257,18 @@ def test_core_to_extended(core, extended):
     assert core.to_extended() == extended
 
 
+@pytest.mark.parametrize(
+    "core,qualified",
+    [
+        pytest.param(core, qualified, id=string)
+        for (string, core, qualified, extended) in VALID_SWHIDS
+        if core is not None
+    ],
+)
+def test_core_to_qualified(core, qualified):
+    assert core.to_qualified() == qualified
+
+
 @pytest.mark.parametrize(
     "ns,version,type,id,qualifiers",
     [