ansible/test/units/template/test_templar.py

# (c) 2012-2014, Michael DeHaan <michael.dehaan@gmail.com>
#
# This file is part of Ansible
#
# Ansible 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.
#
# Ansible 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 Ansible.  If not, see <http://www.gnu.org/licenses/>.

# Make coding more python3-ish
from __future__ import (absolute_import, division, print_function)
__metaclass__ = type

from ansible.compat.tests import unittest
from ansible.compat.tests.mock import patch, MagicMock

from ansible import constants as C
from ansible.errors import *
from ansible.plugins import filter_loader, lookup_loader, module_loader
from ansible.executor.task_queue_manager import SharedPluginLoaderObj
from ansible.template import Templar

from units.mock.loader import DictDataLoader

class TestTemplar(unittest.TestCase):

    def setUp(self):
        fake_loader = DictDataLoader({
          "/path/to/my_file.txt": "foo\n",
        })
        shared_loader = SharedPluginLoaderObj()
        variables = dict(
            foo="bar",
            bam="{{foo}}",
            num=1,
            var_true=True,
            var_false=False,
            var_dict=dict(a="b"),
            bad_dict="{a='b'",
            var_list=[1],
            recursive="{{recursive}}",
        )
        self.templar = Templar(loader=fake_loader, variables=variables)

    def tearDown(self):
        pass

    def test_templar_simple(self):

        templar = self.templar
        # test some basic templating
        self.assertEqual(templar.template("{{foo}}"), "bar")
        self.assertEqual(templar.template("{{foo}}\n"), "bar\n")
        self.assertEqual(templar.template("{{foo}}\n", preserve_trailing_newlines=True), "bar\n")
        self.assertEqual(templar.template("{{foo}}\n", preserve_trailing_newlines=False), "bar")
        self.assertEqual(templar.template("{{bam}}"), "bar")
        self.assertEqual(templar.template("{{num}}"), 1)
        self.assertEqual(templar.template("{{var_true}}"), True)
        self.assertEqual(templar.template("{{var_false}}"), False)
        self.assertEqual(templar.template("{{var_dict}}"), dict(a="b"))
        self.assertEqual(templar.template("{{bad_dict}}"), "{a='b'")
        self.assertEqual(templar.template("{{var_list}}"), [1])
        self.assertEqual(templar.template(1, convert_bare=True), 1)

        # force errors
        self.assertRaises(AnsibleUndefinedVariable, templar.template, "{{bad_var}}")
        self.assertRaises(AnsibleUndefinedVariable, templar.template, "{{lookup('file', bad_var)}}")
        self.assertRaises(AnsibleError, templar.template, "{{lookup('bad_lookup')}}")
        self.assertRaises(AnsibleError, templar.template, "{{recursive}}")
        self.assertRaises(AnsibleUndefinedVariable, templar.template, "{{foo-bar}}")

        # test with fail_on_undefined=False
        self.assertEqual(templar.template("{{bad_var}}", fail_on_undefined=False), "{{bad_var}}")

        # test set_available_variables()
        templar.set_available_variables(variables=dict(foo="bam"))
        self.assertEqual(templar.template("{{foo}}"), "bam")
        # variables must be a dict() for set_available_variables()
        self.assertRaises(AssertionError, templar.set_available_variables, "foo=bam")

    def test_templar_escape_backslashes(self):
        # Rule of thumb: If escape backslashes is True you should end up with
        # the same number of backslashes as when you started.
        self.assertEqual(self.templar.template("\t{{foo}}", escape_backslashes=True), "\tbar")
        self.assertEqual(self.templar.template("\t{{foo}}", escape_backslashes=False), "\tbar")
        self.assertEqual(self.templar.template("\\{{foo}}", escape_backslashes=True), "\\bar")
        self.assertEqual(self.templar.template("\\{{foo}}", escape_backslashes=False), "\\bar")
        self.assertEqual(self.templar.template("\\{{foo + '\t' }}", escape_backslashes=True), "\\bar\t")
        self.assertEqual(self.templar.template("\\{{foo + '\t' }}", escape_backslashes=False), "\\bar\t")
        self.assertEqual(self.templar.template("\\{{foo + '\\t' }}", escape_backslashes=True), "\\bar\\t")
        self.assertEqual(self.templar.template("\\{{foo + '\\t' }}", escape_backslashes=False), "\\bar\t")
        self.assertEqual(self.templar.template("\\{{foo + '\\\\t' }}", escape_backslashes=True), "\\bar\\\\t")
        self.assertEqual(self.templar.template("\\{{foo + '\\\\t' }}", escape_backslashes=False), "\\bar\\t")

    def test_template_jinja2_extensions(self):
        fake_loader = DictDataLoader({})
        templar = Templar(loader=fake_loader)
        
        old_exts = C.DEFAULT_JINJA2_EXTENSIONS
        try:
            C.DEFAULT_JINJA2_EXTENSIONS = "foo,bar"
            self.assertEqual(templar._get_extensions(), ['foo', 'bar'])
        finally:
            C.DEFAULT_JINJA2_EXTENSIONS = old_exts