Add initial postprocess unit test thingy.

recipe_engine/unittests/checker_test.py

Index: recipe_engine/unittests/checker_test.py
diff --git a/recipe_engine/unittests/checker_test.py b/recipe_engine/unittests/checker_test.py
new file mode 100755
index 0000000000000000000000000000000000000000..ead50906a18f1277c56d23e2b4261b3225c8fb3a
--- /dev/null
+++ b/recipe_engine/unittests/checker_test.py
@@ -0,0 +1,92 @@
+#!/usr/bin/env python
+# Copyright 2016 The LUCI Authors. All rights reserved.
+# Use of this source code is governed under the Apache License, Version 2.0
+# that can be found in the LICENSE file.
+
+import json
+import os
+import subprocess
+import sys
+import unittest
+import copy
+
+from collections import OrderedDict
+
+import test_env
+import mock
+
+from recipe_engine import checker
+
+class TestChecker(unittest.TestCase):
+  pass
+
+
+class TestVerifySubset(unittest.TestCase):
+  @staticmethod
+  def mkData(*steps):
+    return OrderedDict([
+      (s, {
+        'cmd': ['list', 'of', 'things'],
+        'env': {
+          'dict': 'of',
+          'many': 'strings,'
+        },
+        'name': s,
+        'status_code': 1,
+      }) for s in steps
+    ])
+
+  def setUp(self):
+    self.v = checker.VerifySubset
+    self.d = self.mkData('a', 'b', 'c')
+    self.c = copy.deepcopy(self.d)
+
+  def test_types(self):
+    self.assertIn(
+      "type mismatch: 'str' v 'OrderedDict'",
+      self.v('hi', self.d))
+
+    self.assertIn(
+      "type mismatch: 'list' v 'OrderedDict'",
+      self.v(['hi'], self.d))
+
+  def test_empty(self):
+    self.assertIsNone(self.v({}, self.d))
+    self.assertIsNone(self.v(OrderedDict(), self.d))
+
+  def test_single_removal(self):
+    del self.c['c']
+    self.assertIsNone(self.v(self.c, self.d))
+
+  def test_add(self):
+    self.c['d'] = self.c['a']
+    self.assertIn(
+      "added key 'd'",
+      self.v(self.c, self.d))
+
+  def test_add_key(self):
+    self.c['c']['blort'] = 'cake'
+    self.assertIn(
+      "added key 'blort'",
+      self.v(self.c, self.d))
+
+  def test_key_alter(self):
+    self.c['c']['cmd'] = 'cake'
+    self.assertEqual(
+      "['c']['cmd']: type mismatch: 'str' v 'list'",
+      self.v(self.c, self.d))
+
+  def test_list_add(self):
+    self.c['c']['cmd'].append('something')
+    self.assertIn(
+      "['c']['cmd']: too long: 4 v 3",
+      self.v(self.c, self.d))
+
+    self.c['c']['cmd'].pop(0)
+    self.assertIn(
+      "['c']['cmd']: added 1 elements",
+      self.v(self.c, self.d))
+
+
+if __name__ == '__main__':
+  sys.exit(unittest.main())