add a module global for whether the current runtime supports the builtin breakpoint function

_pytest/debugging.py

@@ -4,6 +4,12 @@ import pdb
 import sys
 from doctest import UnexpectedException
 
+try:
+    from builtins import breakpoint  # noqa
+    SUPPORTS_BREAKPOINT_BUILTIN = True
+except ImportError:
+    SUPPORTS_BREAKPOINT_BUILTIN = False
+
 
 def pytest_addoption(parser):
     group = parser.getgroup("general")

testing/test_debugging.py

@@ -8,7 +8,8 @@ class TestDebugging(object):
 
     def test_supports_breakpoint_module_global(self):
         """
-        Test that supports breakpoint global marks on Python 3.7+
+        Test that supports breakpoint global marks on Python 3.7+ and not on 
+        CPython 3.5, 2.7
         """
         if sys.version_info.major == 3 and sys.version_info.minor >= 7:
             assert SUPPORTS_BREAKPOINT_BUILTIN is True