Added NOSE_IGNORE_CONFIG_FILES as env variable option

3 files changed, 45 insertions, 2 deletions

diff --git a/doc/usage.rst b/doc/usage.rst
index 11e682b..381b6b6 100644
--- a/doc/usage.rst
+++ b/doc/usage.rst
@@ -13,6 +13,11 @@ standard .ini-style config files. Put your nosetests configuration in a
    [nosetests]
    verbosity=3
    with-doctest=1
+
+There is also possiblity to disable configuration files loading (might be
+useful when runnig i.e. tox and you don't want want your global nose config
+file to be used by tox). In order to ignore those configuration files simply
+set an environment variable ``NOSE_IGNORE_CONFIG_FILES``.
   
 There are several other ways to use the nose test runner besides the
 `nosetests` script. You may use nose in a test script::
diff --git a/nose/core.py b/nose/core.py
index e57a88f..4d23e38 100644
--- a/nose/core.py
+++ b/nose/core.py
@@ -117,11 +117,18 @@ class TestProgram(unittest.TestProgram):
             argv=argv, testRunner=testRunner, testLoader=testLoader,
             **extra_args)
 
+    def getAllConfigFiles(self, env=None):
+        env = env or {}
+        if env.get('NOSE_IGNORE_CONFIG_FILES', False):
+            return []
+        else:
+            return all_config_files()
+
     def makeConfig(self, env, plugins=None):
         """Load a Config, pre-filled with user config files if any are
         found.
         """
-        cfg_files = all_config_files()
+        cfg_files = self.getAllConfigFiles(env)
         if plugins:
             manager = PluginManager(plugins=plugins)
         else:
diff --git a/unit_tests/test_core.py b/unit_tests/test_core.py
index d84c085..94b9436 100644
--- a/unit_tests/test_core.py
+++ b/unit_tests/test_core.py
@@ -4,7 +4,7 @@ import unittest
 from cStringIO import StringIO
 from optparse import OptionParser
 import nose.core
-from nose.config import Config
+from nose.config import Config, all_config_files
 from nose.tools import set_trace
 from mock import Bucket, MockOptParser
 
@@ -64,5 +64,36 @@ class TestUsage(unittest.TestCase):
             else:
                 del nose.__loader__
 
+
+class DummyTestProgram(nose.core.TestProgram):
+    def __init__(self, *args, **kwargs):
+        pass
+
+
+class TestProgramConfigs(unittest.TestCase):
+
+    def setUp(self):
+        self.program = DummyTestProgram()
+
+    def test_getAllConfigFiles(self):
+        self.assertEqual(self.program.getAllConfigFiles(), all_config_files())
+
+    def test_getAllConfigFiles_ignore_configs(self):
+        env = {'NOSE_IGNORE_CONFIG_FILES': 'yes'}
+        self.assertEqual(self.program.getAllConfigFiles(env), [])
+
+    def test_makeConfig(self):
+        calls = []
+        class TestProgramMock(DummyTestProgram):
+            def getAllConfigFiles(self, env):
+                calls.append(env)
+                return []
+
+        program = TestProgramMock()
+        env = {'foo': 'bar'}
+        program.makeConfig(env)
+        self.assertEqual(calls, [env])
+
+
 if __name__ == '__main__':
     unittest.main()