deprecate var and add test

Author: purna135

pytensor/tensor/var.py

@@ -0,0 +1,11 @@
+import warnings
+
+
+from pytensor.tensor.variable import *  # noqa
+
+warnings.warn(
+    "The module 'pytensor.tensor.var' has been deprecated. "
+    "Use 'pytensor.tensor.variable' instead.",
+    category=DeprecationWarning,
+    stacklevel=2,
+)

tests/tensor/test_variable.py

@@ -405,3 +405,15 @@ def test_take(self):
         assert_array_equal(X.take(indices, 1).eval({X: x}), x.take(indices, 1))
         # Test equivalent advanced indexing
         assert_array_equal(X[:, indices].eval({X: x}), x[:, indices])
+
+
+def test_deprecated_import():
+    with pytest.warns(
+        DeprecationWarning,
+        match="The module 'pytensor.tensor.var' has been deprecated.",
+    ):
+        import pytensor.tensor.var as _var
+
+        # Make sure the deprecated import provides access to 'variable' module
+        assert hasattr(_var, "TensorVariable")
+        assert hasattr(_var, "TensorConstant")