emitting warnings instead of installing distributions from option

2 files changed, 21 insertions, 2 deletions

diff --git a/src/distutils2/tests/test_test.py b/src/distutils2/tests/test_test.py
index 7159af6..da60d92 100644
--- a/src/distutils2/tests/test_test.py
+++ b/src/distutils2/tests/test_test.py
@@ -4,6 +4,7 @@ from os.path import join
 from StringIO import StringIO
 from distutils2.tests.support import unittest, TempdirManager
 from distutils2.command.test import test
+from distutils2.dist import Distribution
 import subprocess
 
 try:
@@ -83,8 +84,19 @@ class TestTest(TempdirManager, unittest.TestCase):
     def _test_works_with_2to3(self):
         pass
 
-    def _test_downloads_test_requires(self):
-        pass
+    @unittest.skipUnless(sys.version > '2.6', 'Need >= 2.6')
+    def test_checks_requires(self):
+        from distutils2.tests.with_support import examine_warnings
+        dist = Distribution()
+        dist.tests_require = ['ohno_ohno-impossible_1234-name_stop-that!']
+        cmd = test(dist)
+        def examinator(ws):
+            cmd.ensure_finalized()
+            self.assertEqual(1, len(ws))
+            warning = ws[0]
+            self.assertIs(warning.category, RuntimeWarning)
+
+        examine_warnings(examinator)
 
 def test_suite():
     return unittest.makeSuite(TestTest)
diff --git a/src/distutils2/tests/with_support.py b/src/distutils2/tests/with_support.py
new file mode 100644
index 0000000..bca0197
--- /dev/null
+++ b/src/distutils2/tests/with_support.py
@@ -0,0 +1,7 @@
+def examine_warnings(examinator):
+    """Given an examinator function calls it as if the code was under with
+    catch_warnings block. Useful for testing older Python versions"""
+    import warnings
+    warnings.simplefilter('default')
+    with warnings.catch_warnings(record=True) as ws:
+        examinator(ws)