1 files changed, 12 insertions, 0 deletions
diff --git a/tests/run/bytesmethods.pyx b/tests/run/bytesmethods.pyx
index f2a10e1d2..fecdcc668 100644
--- a/tests/run/bytesmethods.pyx
+++ b/tests/run/bytesmethods.pyx
@@ -11,6 +11,8 @@ SSIZE_T_MIN = PY_SSIZE_T_MIN
 b_a = b'a'
 b_b = b'b'
 
+import sys
+
 
 @cython.test_assert_path_exists(
     "//PythonCapiCallNode")
@@ -277,3 +279,13 @@ def literal_join(*args):
     result = b'|'.join(args)
     assert cython.typeof(result) == 'Python object', cython.typeof(result)
     return result
+
+def fromhex(bytes b):
+    """
+    https://github.com/cython/cython/issues/5051
+    Optimization of bound method calls was breaking classmethods
+    >>> fromhex(b"")
+    """
+    if sys.version_info[0] > 2:
+        assert b.fromhex('2Ef0 F1f2  ') == b'.\xf0\xf1\xf2'
+    # method doesn't exist on Py2!