Fix macOS specific code that uses capturemanager.

#3888 (comment)

closes #3888

Co-authored-by: Bruno Oliveira <[email protected]>

Author: jirikuncar

changelog/3888.bugfix.rst

@@ -0,0 +1 @@
+Fix macOS specific code using ``capturemanager`` plugin in doctests.

src/_pytest/doctest.py

@@ -203,7 +203,8 @@ def _disable_output_capturing_for_darwin(self):
             return
         capman = self.config.pluginmanager.getplugin("capturemanager")
         if capman:
-            out, err = capman.suspend_global_capture(in_=True)
+            capman.suspend_global_capture(in_=True)
+            out, err = capman.read_global_capture()
             sys.stdout.write(out)
             sys.stderr.write(err)