Move unit test compat code out of lib/ansible/. (#46996)

* Move ansible.compat.tests to test/units/compat/.
* Fix unit test references to ansible.compat.tests.
* Move builtins compat to separate file.
* Fix classification of test/units/compat/ dir.

test/units/compat/mock.py

@@ -0,0 +1,122 @@
+# (c) 2014, Toshio Kuratomi <tkuratomi@ansible.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
+
+'''
+Compat module for Python3.x's unittest.mock module
+'''
+import sys
+
+# Python 2.7
+
+# Note: Could use the pypi mock library on python3.x as well as python2.x.  It
+# is the same as the python3 stdlib mock library
+
+try:
+    # Allow wildcard import because we really do want to import all of mock's
+    # symbols into this compat shim
+    # pylint: disable=wildcard-import,unused-wildcard-import
+    from unittest.mock import *
+except ImportError:
+    # Python 2
+    # pylint: disable=wildcard-import,unused-wildcard-import
+    try:
+        from mock import *
+    except ImportError:
+        print('You need the mock library installed on python2.x to run tests')
+
+
+# Prior to 3.4.4, mock_open cannot handle binary read_data
+if sys.version_info >= (3,) and sys.version_info < (3, 4, 4):
+    file_spec = None
+
+    def _iterate_read_data(read_data):
+        # Helper for mock_open:
+        # Retrieve lines from read_data via a generator so that separate calls to
+        # readline, read, and readlines are properly interleaved
+        sep = b'\n' if isinstance(read_data, bytes) else '\n'
+        data_as_list = [l + sep for l in read_data.split(sep)]
+
+        if data_as_list[-1] == sep:
+            # If the last line ended in a newline, the list comprehension will have an
+            # extra entry that's just a newline.  Remove this.
+            data_as_list = data_as_list[:-1]
+        else:
+            # If there wasn't an extra newline by itself, then the file being
+            # emulated doesn't have a newline to end the last line  remove the
+            # newline that our naive format() added
+            data_as_list[-1] = data_as_list[-1][:-1]
+
+        for line in data_as_list:
+            yield line
+
+    def mock_open(mock=None, read_data=''):
+        """
+        A helper function to create a mock to replace the use of `open`. It works
+        for `open` called directly or used as a context manager.
+
+        The `mock` argument is the mock object to configure. If `None` (the
+        default) then a `MagicMock` will be created for you, with the API limited
+        to methods or attributes available on standard file handles.
+
+        `read_data` is a string for the `read` methoddline`, and `readlines` of the
+        file handle to return.  This is an empty string by default.
+        """
+        def _readlines_side_effect(*args, **kwargs):
+            if handle.readlines.return_value is not None:
+                return handle.readlines.return_value
+            return list(_data)
+
+        def _read_side_effect(*args, **kwargs):
+            if handle.read.return_value is not None:
+                return handle.read.return_value
+            return type(read_data)().join(_data)
+
+        def _readline_side_effect():
+            if handle.readline.return_value is not None:
+                while True:
+                    yield handle.readline.return_value
+            for line in _data:
+                yield line
+
+        global file_spec
+        if file_spec is None:
+            import _io
+            file_spec = list(set(dir(_io.TextIOWrapper)).union(set(dir(_io.BytesIO))))
+
+        if mock is None:
+            mock = MagicMock(name='open', spec=open)
+
+        handle = MagicMock(spec=file_spec)
+        handle.__enter__.return_value = handle
+
+        _data = _iterate_read_data(read_data)
+
+        handle.write.return_value = None
+        handle.read.return_value = None
+        handle.readline.return_value = None
+        handle.readlines.return_value = None
+
+        handle.read.side_effect = _read_side_effect
+        handle.readline.side_effect = _readline_side_effect()
+        handle.readlines.side_effect = _readlines_side_effect
+
+        mock.return_value = handle
+        return mock