jinja 2.10 compat: add missing built-in tests

changelogs/fragments/compat-jinja-2.10-test.yml

@@ -0,0 +1,3 @@
+---
+bugfixes:
+- fixed ansible template failures on older jinja due to missing built-in tests

lib/ansible/plugins/test/compat_jinja_2_10.py

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+# -*- coding: utf-8 -*-
+
+# Copyright (c) 2017, the Jinja Team
+# BSD 3-Clause "New" or "Revised" License (see https://opensource.org/licenses/BSD-3-Clause)
+
+# XXX: These tests exist for compatibility with Jinja < 2.10.  Once every
+# platform has at least 2.10 version of jinja, this file can go away.
+
+from __future__ import (absolute_import, division, print_function)
+__metaclass__ = type
+
+import operator
+
+def test_in(value, seq):
+    """Check if value is in seq.
+    Copied from Jinja 2.10 https://github.com/pallets/jinja/pull/665
+
+    .. versionadded:: 2.10
+    """
+    return value in seq
+
+class TestModule:
+    """copied from jinja 2.10 for consistent test behavior independent of the
+    system jinja version
+    """
+
+    def tests(self):
+        return {
+            'in':          test_in,
+            '==':          operator.eq,
+            'eq':          operator.eq,
+            'equalto':     operator.eq,
+            '!=':          operator.ne,
+            'ne':          operator.ne,
+            '>':           operator.gt,
+            'gt':          operator.gt,
+            'greaterthan': operator.gt,
+            'ge':          operator.ge,
+            '>=':          operator.ge,
+            '<':           operator.lt,
+            'lt':          operator.lt,
+            'lessthan':    operator.lt,
+            '<=':          operator.le,
+            'le':          operator.le,
+        }