Skip hook if cov disabled

AUTHORS.rst

@@ -28,3 +28,4 @@ Authors
 * Jeremy Bowman - https://github.com/jmbowman
 * Samuel Giffard - https://github.com/Mulugruntz
 * Семён Марьясин - https://github.com/MarSoft
+* Alexander Shadchin - https://github.com/shadchin

CHANGELOG.rst

@@ -1,6 +1,12 @@
 Changelog
 =========
 
+2.6.2 (2019-02-05)
+------------------
+
+* Fixed ``'NoneType' object has no attribute 'configure_node'`` issue.
+  Contributed by Alexander Shadchin in `#263 <https://github.com/pytest-dev/pytest-cov/pull/263>`_.
+
 2.6.1 (2019-01-07)
 ------------------
 

src/pytest_cov/plugin.py

@@ -195,15 +195,17 @@ def pytest_configure_node(self, node):
 
         Mark this hook as optional in case xdist is not installed.
         """
-        self.cov_controller.configure_node(node)
+        if not self._disabled:
+            self.cov_controller.configure_node(node)
     pytest_configure_node.optionalhook = True
 
     def pytest_testnodedown(self, node, error):
         """Delegate to our implementation.
 
         Mark this hook as optional in case xdist is not installed.
         """
-        self.cov_controller.testnodedown(node, error)
+        if not self._disabled:
+            self.cov_controller.testnodedown(node, error)
     pytest_testnodedown.optionalhook = True
 
     def _should_report(self):

tests/test_pytest_cov.py

@@ -1439,3 +1439,13 @@ def test_double_cov2(testdir):
         '*1 passed*'
     ])
     assert result.ret == 0
+
+
+def test_cov_and_no_cov(testdir):
+    script = testdir.makepyfile(SCRIPT_SIMPLE)
+    result = testdir.runpytest('-v',
+                               '--cov', '--no-cov',
+                               '-n', '1',
+                               script)
+
+    assert result.ret == 0