New rule key-ordering

closes #67

tests/rules/test_key_ordering.py

@@ -0,0 +1,67 @@
+# -*- coding: utf-8 -*-
+# Copyright (C) 2017 Johannes F. Knauf
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+from tests.common import RuleTestCase
+
+
+class KeyOrderingTestCase(RuleTestCase):
+    rule_id = 'key-ordering'
+
+    def test_disabled(self):
+        conf = 'key-ordering: disable'
+        self.check('---\n'
+                   'block mapping:\n'
+                   '  secondkey: a\n'
+                   '  firstkey: b\n', conf)
+        self.check('---\n'
+                   'flow mapping:\n'
+                   '  {secondkey: a, firstkey: b}\n', conf)
+        self.check('---\n'
+                   'second: before_first\n'
+                   'at: root\n', conf)
+        self.check('---\n'
+                   'nested but OK:\n'
+                   '  second: {first: 1}\n'
+                   '  third:\n'
+                   '    second: 2\n', conf)
+
+    def test_enabled(self):
+        conf = 'key-ordering: enable'
+        self.check('---\n'
+                   'block mapping:\n'
+                   '  secondkey: a\n'
+                   '  firstkey: b\n', conf,
+                   problem=(4, 3))
+        self.check('---\n'
+                   'flow mapping:\n'
+                   '  {secondkey: a, firstkey: b}\n', conf,
+                   problem=(3, 18))
+        self.check('---\n'
+                   'second: before_first\n'
+                   'at: root\n', conf,
+                   problem=(3, 1))
+        self.check('---\n'
+                   'nested but OK:\n'
+                   '  second: {first: 1}\n'
+                   '  third:\n'
+                   '    second: 2\n', conf)
+
+    def test_key_tokens_in_flow_sequences(self):
+        conf = 'key-ordering: enable'
+        self.check('---\n'
+                   '[\n'
+                   '  key: value, mappings, in, flow: sequence\n'
+                   ']\n', conf)