Start new tests

run_tests will collect and run the tests on python 2.6+ (need to test 2.5)
without nose.

flake8/tests/test_engine.py

@@ -0,0 +1,8 @@
+from flake8 import engine
+import unittest
+
+
+class TestEngine(unittest.TestCase):
+    def test_get_style_guide(self):
+        g = engine.get_style_guide()
+        self.assertTrue(isinstance(g, engine.StyleGuide))

run_tests.py

@@ -0,0 +1,32 @@
+#!/usr/bin/env python
+
+import unittest
+import os
+import re
+import sys
+sys.path.insert(0, '.')
+
+TEST_DIR = 'flake8.tests'
+
+
+def collect_tests():
+    # list files in directory tests/
+    names = os.listdir(TEST_DIR.replace('.', '/'))
+    regex = re.compile("(?!_+)\w+\.py$")
+    join = '.'.join
+    # Make a list of the names like 'tests.test_name'
+    names = [join([TEST_DIR, f[:-3]]) for f in names if regex.match(f)]
+    modules = [__import__(name, fromlist=[TEST_DIR]) for name in names]
+    load_tests = unittest.defaultTestLoader.loadTestsFromModule
+    suites = [load_tests(m) for m in modules]
+    suite = suites.pop()
+    for s in suites:
+        suite.addTests(s)
+    return suite
+
+if __name__ == "__main__":
+    suite = collect_tests()
+    res = unittest.TextTestRunner(verbosity=1).run(suite)
+
+    # If it was successful, we don't want to exit with code 1
+    raise SystemExit(not res.wasSuccessful())