1 files changed, 75 insertions, 0 deletions
diff --git a/fixtures/tests/_fixtures/test_environ.py b/fixtures/tests/_fixtures/test_environ.py
new file mode 100644
index 0000000..64594c9
--- /dev/null
+++ b/fixtures/tests/_fixtures/test_environ.py
@@ -0,0 +1,75 @@
+#  fixtures: Fixtures with cleanups for testing and convenience.
+#
+# Copyright (c) 2010, 2011, Robert Collins <robertc@robertcollins.net>
+# 
+# Licensed under either the Apache License, Version 2.0 or the BSD 3-clause
+# license at the users choice. A copy of both licenses are available in the
+# project source as Apache-2.0 and BSD. You may not use this file except in
+# compliance with one of these two licences.
+# 
+# Unless required by applicable law or agreed to in writing, software
+# distributed under these licenses is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+# license you chose for the specific language governing permissions and
+# limitations under that license.
+
+import os
+
+import testtools
+
+from fixtures import EnvironmentVariable, TestWithFixtures
+
+
+class TestEnvironmentVariable(testtools.TestCase, TestWithFixtures):
+
+    def test_setup_ignores_missing(self):
+        fixture = EnvironmentVariable('FIXTURES_TEST_VAR')
+        os.environ.pop('FIXTURES_TEST_VAR', '')
+        self.useFixture(fixture)
+        self.assertEqual(None, os.environ.get('FIXTURES_TEST_VAR'))
+
+    def test_setup_sets_when_missing(self):
+        fixture = EnvironmentVariable('FIXTURES_TEST_VAR', 'bar')
+        os.environ.pop('FIXTURES_TEST_VAR', '')
+        self.useFixture(fixture)
+        self.assertEqual('bar', os.environ.get('FIXTURES_TEST_VAR'))
+
+    def test_setup_deletes(self):
+        fixture = EnvironmentVariable('FIXTURES_TEST_VAR')
+        os.environ['FIXTURES_TEST_VAR'] = 'foo'
+        self.useFixture(fixture)
+        self.assertEqual(None, os.environ.get('FIXTURES_TEST_VAR'))
+
+    def test_setup_overrides(self):
+        fixture = EnvironmentVariable('FIXTURES_TEST_VAR', 'bar')
+        os.environ['FIXTURES_TEST_VAR'] = 'foo'
+        self.useFixture(fixture)
+        self.assertEqual('bar', os.environ.get('FIXTURES_TEST_VAR'))
+
+    def test_cleanup_deletes_when_missing(self):
+        fixture = EnvironmentVariable('FIXTURES_TEST_VAR')
+        os.environ.pop('FIXTURES_TEST_VAR', '')
+        with fixture:
+            os.environ['FIXTURES_TEST_VAR'] = 'foo'
+        self.assertEqual(None, os.environ.get('FIXTURES_TEST_VAR'))
+        
+    def test_cleanup_deletes_when_set(self):
+        fixture = EnvironmentVariable('FIXTURES_TEST_VAR', 'bar')
+        os.environ.pop('FIXTURES_TEST_VAR', '')
+        with fixture:
+            os.environ['FIXTURES_TEST_VAR'] = 'foo'
+        self.assertEqual(None, os.environ.get('FIXTURES_TEST_VAR'))
+
+    def test_cleanup_restores_when_missing(self):
+        fixture = EnvironmentVariable('FIXTURES_TEST_VAR')
+        os.environ['FIXTURES_TEST_VAR'] = 'bar'
+        with fixture:
+            os.environ.pop('FIXTURES_TEST_VAR', '')
+        self.assertEqual('bar', os.environ.get('FIXTURES_TEST_VAR'))
+        
+    def test_cleanup_restores_when_set(self):
+        fixture = EnvironmentVariable('FIXTURES_TEST_VAR')
+        os.environ['FIXTURES_TEST_VAR'] = 'bar'
+        with fixture:
+            os.environ['FIXTURES_TEST_VAR'] = 'quux'
+        self.assertEqual('bar', os.environ.get('FIXTURES_TEST_VAR'))