diff --git a/tests/test_arithmetics.rs b/tests/test_arithmetics.rs
index cff162d6..39367406 100755
--- a/tests/test_arithmetics.rs
+++ b/tests/test_arithmetics.rs
@@ -34,7 +34,7 @@ fn unary_arithmetic() {
     let gil = Python::acquire_gil();
     let py = gil.python();
 
-    let c = Py::new(py, UnaryArithmetic {}).unwrap();
+    let c = PyCell::new(py, UnaryArithmetic {}).unwrap();
     py_run!(py, c, "assert -c == 'neg'");
     py_run!(py, c, "assert +c == 'pos'");
     py_run!(py, c, "assert abs(c) == 'abs'");
@@ -112,7 +112,7 @@ fn inplace_operations() {
     let py = gil.python();
 
     let init = |value, code| {
-        let c = Py::new(py, InPlaceOperations { value }).unwrap();
+        let c = PyCell::new(py, InPlaceOperations { value }).unwrap();
         py_run!(py, c, code);
     };
 
@@ -166,7 +166,7 @@ fn binary_arithmetic() {
     let gil = Python::acquire_gil();
     let py = gil.python();
 
-    let c = Py::new(py, BinaryArithmetic {}).unwrap();
+    let c = PyCell::new(py, BinaryArithmetic {}).unwrap();
     py_run!(py, c, "assert c + c == 'BA + BA'");
     py_run!(py, c, "assert c.__add__(c) == 'BA + BA'");
     py_run!(py, c, "assert c + 1 == 'BA + 1'");
@@ -235,7 +235,7 @@ fn rhs_arithmetic() {
     let gil = Python::acquire_gil();
     let py = gil.python();
 
-    let c = Py::new(py, RhsArithmetic {}).unwrap();
+    let c = PyCell::new(py, RhsArithmetic {}).unwrap();
     py_run!(py, c, "assert c.__radd__(1) == '1 + RA'");
     py_run!(py, c, "assert 1 + c == '1 + RA'");
     py_run!(py, c, "assert c.__rsub__(1) == '1 - RA'");
@@ -256,6 +256,47 @@ fn rhs_arithmetic() {
     py_run!(py, c, "assert 1 ** c == '1 ** RA'");
 }
 
+#[pyclass]
+struct LhsAndRhsArithmetic {}
+
+#[pyproto]
+impl PyNumberProtocol for LhsAndRhsArithmetic {
+    fn __radd__(&self, other: &PyAny) -> PyResult<String> {
+        Ok(format!("{:?} + RA", other))
+    }
+
+    fn __rsub__(&self, other: &PyAny) -> PyResult<String> {
+        Ok(format!("{:?} - RA", other))
+    }
+
+    fn __add__(lhs: &PyAny, rhs: &PyAny) -> PyResult<String> {
+        Ok(format!("{:?} + {:?}", lhs, rhs))
+    }
+
+    fn __sub__(lhs: &PyAny, rhs: &PyAny) -> PyResult<String> {
+        Ok(format!("{:?} - {:?}", lhs, rhs))
+    }
+}
+
+#[pyproto]
+impl PyObjectProtocol for LhsAndRhsArithmetic {
+    fn __repr__(&self) -> PyResult<&'static str> {
+        Ok("BA")
+    }
+}
+
+#[test]
+fn lhs_override_rhs() {
+    let gil = Python::acquire_gil();
+    let py = gil.python();
+
+    let c = PyCell::new(py, LhsAndRhsArithmetic {}).unwrap();
+    py_run!(py, c, "assert c.__radd__(1) == '1 + BA'");
+    py_run!(py, c, "assert 1 + c == '1 + BA'");
+    py_run!(py, c, "assert c.__rsub__(1) == '1 - BA'");
+    py_run!(py, c, "assert 1 - c == '1 - BA'");
+}
+
 #[pyclass]
 struct RichComparisons {}
 
@@ -301,7 +342,7 @@ fn rich_comparisons() {
     let gil = Python::acquire_gil();
     let py = gil.python();
 
-    let c = Py::new(py, RichComparisons {}).unwrap();
+    let c = PyCell::new(py, RichComparisons {}).unwrap();
     py_run!(py, c, "assert (c < c) == 'RC < RC'");
     py_run!(py, c, "assert (c < 1) == 'RC < 1'");
     py_run!(py, c, "assert (1 < c) == 'RC > 1'");
@@ -327,7 +368,7 @@ fn rich_comparisons_python_3_type_error() {
     let gil = Python::acquire_gil();
     let py = gil.python();
 
-    let c2 = Py::new(py, RichComparisons2 {}).unwrap();
+    let c2 = PyCell::new(py, RichComparisons2 {}).unwrap();
     py_expect_exception!(py, c2, "c2 < c2", TypeError);
     py_expect_exception!(py, c2, "c2 < 1", TypeError);
     py_expect_exception!(py, c2, "1 < c2", TypeError);