diff --git a/Lib/test/test_subprocess.py b/Lib/test/test_subprocess.py
index a27ef63..5cdbe2d 100644
--- a/Lib/test/test_subprocess.py
+++ b/Lib/test/test_subprocess.py
@@ -568,6 +568,21 @@
             """Try to prevent core files from being created.
             Returns previous ulimit if successful, else None.
             """
+            if sys.platform == 'darwin':
+                # Check if the 'Crash Reporter' on OSX was configured
+                # in 'Developer' mode and warn that it will get triggered
+                # when it is.
+                #
+                # This assumes that this context manager is used in tests
+                # that might trigger the next manager.
+                value = subprocess.Popen(['/usr/bin/defaults', 'read',
+                    'com.apple.CrashReporter', 'DialogType'],
+                    stdout=subprocess.PIPE).communicate()[0]
+                if value.strip() == b'developer':
+                    print("this tests triggers the Crash Reporter, "
+                          "that is intentional", end='')
+                    sys.stdout.flush()
+
             try:
                 import resource
                 old_limit = resource.getrlimit(resource.RLIMIT_CORE)
@@ -576,6 +591,8 @@
             except (ImportError, ValueError, resource.error):
                 return None
 
+
+
         def _unsuppress_core_files(self, old_limit):
             """Return core file behavior to default."""
             if old_limit is None: