Add initial postprocess unit test thingy.

recipe_engine/unittests/post_process_test.py

Index: recipe_engine/unittests/post_process_test.py
diff --git a/recipe_engine/unittests/post_process_test.py b/recipe_engine/unittests/post_process_test.py
new file mode 100755
index 0000000000000000000000000000000000000000..01b6e2a5679a68e8b85cc6b8d53a368858c096f3
--- /dev/null
+++ b/recipe_engine/unittests/post_process_test.py
@@ -0,0 +1,146 @@
+#!/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 copy
+import json
+import os
+import subprocess
+import sys
+import unittest
+
+from collections import OrderedDict
+
+import test_env
+
+import mock
+
+from recipe_engine import post_process
+from recipe_engine import checker
+
+def mkS(name, *fields):
+  ret = {
+    'name': name,
+    'sub_a': ['thing', 'other'],
+    'sub_b': 100,
+    'sub_c': 'hi',
+  }
+  if fields:
+    return {k: v for k, v in ret.iteritems() if k in fields or k == 'name'}
+  return ret
+
+def mkD(*steps):
+  return OrderedDict([(n, mkS(n)) for n in steps])
+
+class TestFilter(unittest.TestCase):
+  def setUp(self):
+    self.d = mkD('a', 'b', 'b.sub', 'b.sub2')
+    self.f = post_process.Filter
+
+  def test_basic(self):
+    c = checker.Checker('<filename>', 0, lambda: None, (), {})
+    self.assertEqual(
+      self.f('a', 'b')(c, self.d), mkD('a', 'b'))
+    self.assertEqual(len(c.failed_checks), 0)
+
+  def test_built(self):
+    c = checker.Checker('<filename>', 0, lambda: None, (), {})
+    f = self.f()
+    f = f.include('b')
+    f = f.include('a')
+    self.assertEqual(f(c, self.d), mkD('a', 'b'))
+    self.assertEqual(len(c.failed_checks), 0)
+
+  def test_built_fields(self):
+    c = checker.Checker('<filename>', 0, lambda: None, (), {})
+    f = self.f()
+    f = f.include('b', ['sub_b'])
+    f = f.include('a', ['sub_a'])
+    self.assertEqual(f(c, self.d), OrderedDict([
+      ('a', mkS('a', 'sub_a')),
+      ('b', mkS('b', 'sub_b')),
+    ]))
+    self.assertEqual(len(c.failed_checks), 0)
+
+  def test_built_extra_includes(self):
+    f = self.f('a', 'b', 'x')
+    c = checker.Checker('<filename>', 0, f, (), {})
+    self.assertEqual(f(c, self.d), mkD('a', 'b'))
+    self.assertEqual(len(c.failed_checks), 1)
+    self.assertEqual(c.failed_checks[0].frames[-1].code,
+                     'check((len(unused_includes) == 0))')
+    self.assertEqual(c.failed_checks[0].frames[-1].varmap,
+                     {'unused_includes': "{'x': ()}"})
+
+  def test_re(self):
+    f = self.f().include_re('b\.')
+    c = checker.Checker('<filename>', 0, f, (), {})
+    self.assertEqual(f(c, self.d), mkD('b.sub', 'b.sub2'))
+    self.assertEqual(len(c.failed_checks), 0)
+
+  def test_re_low_limit(self):
+    f = self.f().include_re('b\.', at_least=3)
+    c = checker.Checker('<filename>', 0, f, (), {})
+    self.assertEqual(f(c, self.d), mkD('b.sub', 'b.sub2'))
+    self.assertEqual(len(c.failed_checks), 1)
+    self.assertEqual(c.failed_checks[0].frames[-1].code,
+                     'check((re_usage_count[regex] >= at_least))')
+    self.assertEqual(c.failed_checks[0].frames[-1].varmap,
+                     {'at_least': '3',
+                      're_usage_count[regex]': '2',
+                      'regex': "re.compile('b\\\\.')"})
+
+  def test_re_high_limit(self):
+    f = self.f().include_re('b\.', at_most=1)
+    c = checker.Checker('<filename>', 0, f, (), {})
+    self.assertEqual(f(c, self.d), mkD('b.sub', 'b.sub2'))
+    self.assertEqual(len(c.failed_checks), 1)
+    self.assertEqual(c.failed_checks[0].frames[-1].code,
+                     'check((re_usage_count[regex] <= at_most))')
+    self.assertEqual(c.failed_checks[0].frames[-1].varmap,
+                     {'at_most': '1',
+                      're_usage_count[regex]': '2',
+                      'regex': "re.compile('b\\\\.')"})
+
+
+class TestRun(unittest.TestCase):
+  def setUp(self):
+    self.d = mkD('a', 'b', 'b.sub', 'b.sub2')
+
+  def expect_fails(self, num_fails, func, *args, **kwargs):
+    c = checker.Checker('<filename>', 0, func, args, kwargs)
+    func(c, self.d, *args, **kwargs)
+    self.assertEqual(len(c.failed_checks), num_fails)
+
+  def test_mr_pass(self):
+    self.expect_fails(0, post_process.MustRun, 'a')
+
+  def test_mr_fail(self):
+    self.expect_fails(1, post_process.MustRun, 'x')
+
+  def test_mr_pass_re(self):
+    self.expect_fails(0, post_process.MustRunRE, 'a')
+    self.expect_fails(0, post_process.MustRunRE, 'a', at_most=1)
+    self.expect_fails(0, post_process.MustRunRE, 'a', at_least=1, at_most=1)
+
+  def test_mr_fail_re(self):
+    self.expect_fails(1, post_process.MustRunRE, 'x')
+    self.expect_fails(1, post_process.MustRunRE, 'b', at_most=1)
+    self.expect_fails(1, post_process.MustRunRE, 'b', at_least=4)
+
+  def test_dnr_pass(self):
+    self.expect_fails(0, post_process.DoesNotRun, 'x')
+
+  def test_dnr_fail(self):
+    self.expect_fails(1, post_process.DoesNotRun, 'a')
+
+  def test_dnr_pass_re(self):
+    self.expect_fails(0, post_process.DoesNotRunRE, 'x')
+
+  def test_dnr_fail_re(self):
+    self.expect_fails(3, post_process.DoesNotRunRE, 'b')
+
+
+if __name__ == '__main__':
+  sys.exit(unittest.main())