Support setting configuration using the PYTEST_ADDOPTS environment variable.

--HG--
branch : env-addopts

_pytest/config.py

@@ -705,6 +705,8 @@ class Config(object):
     def _preparse(self, args, addopts=True):
         self._initini(args)
         if addopts:
+            env_addopts = os.environ.get('PYTEST_ADDOPTS', '')
+            args[:] = env_addopts.replace('"', '').split() + args
             args[:] = self.getini("addopts") + args
         self._checkversion()
         self.pluginmanager.consider_preparse(args)

testing/test_config.py

@@ -1,3 +1,5 @@
+import os
+
 import py, pytest
 
 from _pytest.config import getcfg
@@ -19,11 +21,16 @@ class TestParseIni:
         getcfg([''], ['setup.cfg']) #happens on py.test ""
 
     def test_append_parse_args(self, testdir, tmpdir):
+        os.environ['PYTEST_ADDOPTS'] = '--color no -rs --tb="short"'
         tmpdir.join("setup.cfg").write(py.code.Source("""
             [pytest]
             addopts = --verbose
         """))
         config = testdir.parseconfig(tmpdir)
+        del os.environ['PYTEST_ADDOPTS']
+        assert config.option.color == 'no'
+        assert config.option.reportchars == 's'
+        assert config.option.tbstyle == 'short'
         assert config.option.verbose
         #config = testdir.Config()
         #args = [tmpdir,]