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from __future__ import (absolute_import, division, print_function)
__metaclass__ = type
import io
import yaml
from ansible.parsing.yaml.dumper import AnsibleDumper
class YamlTestUtils(object):
"""Mixin class to combine with a unittest.TestCase subclass."""
def _loader(self, stream):
"""Vault related tests will want to override this.
Vault cases should setup a AnsibleLoader that has the vault password."""
def _dump_stream(self, obj, stream, dumper=None):
"""Dump to a py2-unicode or py3-string stream."""
return yaml.dump(obj, stream, Dumper=dumper)
def _dump_string(self, obj, dumper=None):
"""Dump to a py2-unicode or py3-string"""
return yaml.dump(obj, Dumper=dumper)
def _dump_load_cycle(self, obj):
# Each pass though a dump or load revs the 'generation'
# obj to yaml string
string_from_object_dump = self._dump_string(obj, dumper=AnsibleDumper)
# wrap a stream/file like StringIO around that yaml
stream_from_object_dump = io.StringIO(string_from_object_dump)
loader = self._loader(stream_from_object_dump)
# load the yaml stream to create a new instance of the object (gen 2)
obj_2 = loader.get_data()
# dump the gen 2 objects directory to strings
string_from_object_dump_2 = self._dump_string(obj_2,
dumper=AnsibleDumper)
# The gen 1 and gen 2 yaml strings
self.assertEqual(string_from_object_dump, string_from_object_dump_2)
# the gen 1 (orig) and gen 2 py object
self.assertEqual(obj, obj_2)
# again! gen 3... load strings into py objects
stream_3 = io.StringIO(string_from_object_dump_2)
loader_3 = self._loader(stream_3)
obj_3 = loader_3.get_data()
string_from_object_dump_3 = self._dump_string(obj_3, dumper=AnsibleDumper)
self.assertEqual(obj, obj_3)
# should be transitive, but...
self.assertEqual(obj_2, obj_3)
self.assertEqual(string_from_object_dump, string_from_object_dump_3)
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