Add greater/less than tests

This patch adds tests for > and < to Jinja2 templates in Ansible. This
allows them to be easily used with filters like select or selectattr:

  vehicles | selectattr('wheels',' 'greater_than', 4)

Change-Id: I3dc057f121ff5548a9820728a6ff0258be5d7738

test/osa_tests.py

@@ -0,0 +1,36 @@
+#!/usr/bin/env python
+# Copyright 2016, Rackspace US, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""Extra tests for jinja2 templates in Ansible."""
+
+
+def greater_than(value, reference_value):
+    """Return true if value > reference_value."""
+    return value > reference_value
+
+
+def less_than(value, reference_value):
+    """Return true if value < reference_value."""
+    return value < reference_value
+
+
+class TestModule:
+    """Main test class from Ansible."""
+
+    def tests(self):
+        """Add these tests to the list of tests available to Ansible."""
+        return {
+            'greater_than': greater_than,
+            'less_than': less_than,
+        }