[API Compatibility] enhance __version__ tests -part

tests/test___version__.py

@@ -19,6 +19,17 @@
 
 
 class VersionAPI(APIBase):
+    """Equivalence check for ``torch.__version__`` / ``paddle.__version__``.
+
+    ``torch.torch_version.TorchVersion`` is a ``str`` subclass whose
+    comparison operators dispatch through ``packaging.version.Version``,
+    falling back to plain string comparison on invalid versions. The Paddle
+    equivalent must mirror that surface. Each framework parses ``Version``
+    with its own copy of ``packaging`` (torch vendors it), so this test
+    compares only against ``str`` / ``tuple`` inputs -- both implementations
+    convert those through their own ``Version`` internally.
+    """
+
     def compare(
         self,
         name,
@@ -31,8 +42,40 @@ def compare(
         rtol=1.0e-6,
         atol=0.0,
     ):
-        # torch return: torch.torch_version.TorchVersion
-        assert type(str(pytorch_result)) == type(paddle_result)
+        assert isinstance(
+            pytorch_result, str
+        ), f"pytorch result should be a str (subclass), got {type(pytorch_result)}"
+        assert isinstance(
+            paddle_result, str
+        ), f"paddle result should be a str (subclass), got {type(paddle_result)}"
+
+        assert str(pytorch_result), "pytorch version string is empty"
+        assert str(paddle_result), "paddle version string is empty"
+
+        assert isinstance(pytorch_result.split("."), list)
+        assert isinstance(paddle_result.split("."), list)
+        assert pytorch_result.startswith(str(pytorch_result)[0])
+        assert paddle_result.startswith(str(paddle_result)[0])
+
+        assert (pytorch_result == str(pytorch_result)) is True
+        assert (paddle_result == str(paddle_result)) is True
+
+        assert (pytorch_result > "0.0.1") is True
+        assert (paddle_result > "0.0.1") is True
+        assert (pytorch_result > (0, 0, 1)) is True
+        assert (paddle_result > (0, 0, 1)) is True
+        assert (pytorch_result >= "0.0.1") is True
+        assert (paddle_result >= "0.0.1") is True
+        assert (pytorch_result < "999.0") is True
+        assert (paddle_result < "999.0") is True
+
+        assert (pytorch_result == "parrot") == (paddle_result == "parrot")
+        assert (pytorch_result != "parrot") == (paddle_result != "parrot")
+
+        # __eq__ is installed via setattr on both, which does not implicitly
+        # reset __hash__ to None -- guard against that regression.
+        hash(pytorch_result)
+        hash(paddle_result)
 
 
 obj = VersionAPI("torch.__version__")