add check for support of breakpoint() and use Custom Pdb class when system default is set

_pytest/debugging.py

@@ -2,6 +2,7 @@
 from __future__ import absolute_import, division, print_function
 import pdb
 import sys
+import os
 from doctest import UnexpectedException
 
 try:
@@ -33,12 +34,19 @@ def pytest_configure(config):
     if config.getvalue("usepdb"):
         config.pluginmanager.register(PdbInvoke(), 'pdbinvoke')
 
+    # Use custom Pdb class set_trace instead of default Pdb on breakpoint() call
+    if SUPPORTS_BREAKPOINT_BUILTIN:
+        _environ_pythonbreakpoint = getattr(os.environ, 'PYTHONBREAKPOINT', '')
+        if _environ_pythonbreakpoint == '':
+            sys.breakpointhook = pytestPDB.set_trace
+
     old = (pdb.set_trace, pytestPDB._pluginmanager)
 
     def fin():
         pdb.set_trace, pytestPDB._pluginmanager = old
         pytestPDB._config = None
         pytestPDB._pdb_cls = pdb.Pdb
+        sys.breakpointhook = sys.__breakpointhook__
 
     pdb.set_trace = pytestPDB.set_trace
     pytestPDB._pluginmanager = config.pluginmanager