Fix use of deprecated getfuncargvalue method in the internal doctest plugin

Fix #1898

Author: nicoddemus

CHANGELOG.rst

@@ -21,16 +21,21 @@
   enabled. This allows proper post mortem debugging for all applications
   which have significant logic in their tearDown machinery (`#1890`_). Thanks
   `@mbyt`_ for the PR.
+  
+* Fix use of deprecated ``getfuncargvalue`` method in the internal doctest plugin.
+  Thanks `@ViviCoder`_ for the report (`#1898`_).
 
 .. _@joguSD: https://github.com/joguSD
 .. _@AiOO: https://github.com/AiOO
 .. _@mbyt: https://github.com/mbyt
+.. _@ViviCoder: https://github.com/ViviCoder
 
 .. _#1857: https://github.com/pytest-dev/pytest/issues/1857
 .. _#1864: https://github.com/pytest-dev/pytest/issues/1864
 .. _#1888: https://github.com/pytest-dev/pytest/issues/1888
 .. _#1891: https://github.com/pytest-dev/pytest/pull/1891
 .. _#1890: https://github.com/pytest-dev/pytest/issues/1890
+.. _#1898: https://github.com/pytest-dev/pytest/issues/1898
 
 
 3.0.1

_pytest/doctest.py

@@ -88,7 +88,7 @@ def setup(self):
         if self.dtest is not None:
             self.fixture_request = _setup_fixtures(self)
             globs = dict(getfixture=self.fixture_request.getfixturevalue)
-            for name, value in self.fixture_request.getfuncargvalue('doctest_namespace').items():
+            for name, value in self.fixture_request.getfixturevalue('doctest_namespace').items():
                 globs[name] = value
             self.dtest.globs.update(globs)