Revert of Cross-repo recipe package system.

third_party/recipe_engine/unittests/field_composer_test.py

+#!/usr/bin/env python
+# Copyright 2013 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import os
+import shutil
+import sys
+import tempfile
+import unittest
+
+sys.path.append(os.path.dirname(os.path.dirname(os.path.dirname(
+    os.path.abspath(__file__)))))
+
+from recipe_engine import field_composer
+
+
+# Functors are compared by reference.
+BEAUTY_LAMBDA = lambda x, y: x + y + 1
+
+
+class TestFieldComposer(unittest.TestCase):
+
+  def setUp(self):
+    super(TestFieldComposer, self).setUp()
+    _functors = {
+      'beauty': {'combine': BEAUTY_LAMBDA},
+      'despair': {'combine': lambda x, y: x * y}}
+    self.fc = field_composer.FieldComposer(
+        {'beauty': 7, 'despair': 10}, _functors)
+
+  def test_init_degenerate_registry(self):
+    """Lack of 'combine' in registry value should raise an error."""
+    with self.assertRaises(field_composer.DegenerateRegistryError):
+      field_composer.FieldComposer(
+          {'hello': 'hello'}, {'hello': {'darkness': 'my old friend'}})
+
+  def test_dict_methods_ok(self):
+    """FieldComposer acts as a dict for some methods."""
+    for key in ['beauty', 'despair', 'absence']:
+      # fc.get returns fc._fields.get
+      self.assertEqual(self.fc._fields.get(key), self.fc.get(key))
+      self.assertEqual(self.fc._fields.get(key, 1), self.fc.get(key, 1))
+
+      # in fc returns in fc._fields
+      self.assertEqual(key in self.fc, key in self.fc._fields)
+
+      # fc[key] returns fc._fields[key]
+      if key in self.fc:
+        self.assertEqual(self.fc[key], self.fc._fields[key])
+      else:
+        with self.assertRaises(KeyError):
+          _ = self.fc._fields[key]
+
+  def test_compose_with_dict_ok(self):
+    new_fields = {'beauty': 9}
+    new_fc = self.fc.compose(new_fields)
+    expected = {'beauty': 17, 'despair': 10}
+    self.assertEqual(expected, new_fc._fields)
+
+  def test_compose_with_unknown_field(self):
+    """CompositionUndefined must be raised when kwargs don't have combiners."""
+    with self.assertRaises(field_composer.CompositionUndefined):
+      self.fc.compose({'beauty': 9, 'hope': 'none to speak of'})
+
+  def test_compose_with_compositor_ok(self):
+    second_fc = field_composer.FieldComposer(
+        {'beauty': 9}, {'beauty': {'combine': BEAUTY_LAMBDA}})
+    new_fc = self.fc.compose(second_fc)
+    expected = {'beauty': 17, 'despair': 10}
+    self.assertEqual(expected, new_fc._fields)
+
+  def test_compose_with_sneaky_bad_registry(self):
+    """RegistryConflict must be raised when functors clash."""
+    second_fc = field_composer.FieldComposer(
+        {}, {'beauty': {'combine': lambda x, y: 0}})
+    with self.assertRaises(field_composer.RegistryConflict):
+      self.fc.compose(second_fc)
+
+
+if __name__ == '__main__':
+  unittest.main()