Add buildah test and stub

tests/buildah_test.py

@@ -0,0 +1,28 @@
+import os
+
+import mitogen
+
+import unittest2
+
+import testlib
+
+
+class ConstructorTest(testlib.RouterMixin, testlib.TestCase):
+    def test_okay(self):
+        buildah_path = testlib.data_path('stubs/stub-buildah.py')
+        context = self.router.buildah(
+            container='container_name',
+            buildah_path=buildah_path,
+        )
+        stream = self.router.stream_by_id(context.context_id)
+
+        argv = eval(context.call(os.getenv, 'ORIGINAL_ARGV'))
+        self.assertEquals(argv[0], buildah_path)
+        self.assertEquals(argv[1], 'run')
+        self.assertEquals(argv[2], '--')
+        self.assertEquals(argv[3], 'container_name')
+        self.assertEquals(argv[4], stream.python_path)
+
+
+if __name__ == '__main__':
+    unittest2.main()

tests/data/stubs/stub-buildah.py

@@ -0,0 +1,8 @@
+#!/usr/bin/env python
+
+import sys
+import os
+
+os.environ['ORIGINAL_ARGV'] = repr(sys.argv)
+os.environ['THIS_IS_STUB_BUILDAH'] = '1'
+os.execv(sys.executable, sys.argv[sys.argv.index('--') + 2:])