issue #409: add kubectl stub and constructor test.

tests/data/stubs/stub-kubectl.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_KUBECTL'] = '1'
+os.execv(sys.executable, sys.argv[sys.argv.index('--') + 1:])

tests/kubectl_test.py

@@ -0,0 +1,29 @@
+
+import os
+
+import mitogen
+import mitogen.parent
+
+import unittest2
+
+import testlib
+
+
+class ConstructorTest(testlib.RouterMixin, testlib.TestCase):
+    kubectl_path = testlib.data_path('stubs/stub-kubectl.py')
+
+    def test_okay(self):
+        context = self.router.kubectl(
+            pod='pod_name',
+            kubectl_path=self.kubectl_path
+        )
+
+        argv = eval(context.call(os.getenv, 'ORIGINAL_ARGV'))
+        self.assertEquals(argv[0], self.kubectl_path)
+        self.assertEquals(argv[1], 'exec')
+        self.assertEquals(argv[2], '-it')
+        self.assertEquals(argv[3], 'pod_name')
+
+
+if __name__ == '__main__':
+    unittest2.main()