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# -*- coding: utf-8 -*-
# Copyright 2019 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""Helper functions for unit testing."""
from __future__ import print_function
from contextlib import contextmanager
from tempfile import mkstemp
import json
import os
# FIXME: Migrate modules with similar helper to use this module.
def CallCountsToMockFunctions(mock_function):
"""A decorator that passes a call count to the function it decorates.
Examples:
@CallCountsToMockFunctions
def foo(call_count):
return call_count
...
...
[foo(), foo(), foo()]
[0, 1, 2]
NOTE: This decorator will not handle recursive functions properly.
"""
counter = [0]
def Result(*args, **kwargs):
ret_value = mock_function(counter[0], *args, **kwargs)
counter[0] += 1
return ret_value
return Result
def WritePrettyJsonFile(file_name, json_object):
"""Writes the contents of the file to the json object.
Args:
file_name: The file that has contents to be used for the json object.
json_object: The json object to write to.
"""
json.dump(file_name, json_object, indent=4, separators=(',', ': '))
@contextmanager
def CreateTemporaryJsonFile():
"""Makes a temporary .json file."""
# Create a temporary file to simulate a .json file.
fd, temp_file_path = mkstemp()
temp_json_file = '%s.json' % temp_file_path
os.close(fd)
os.remove(temp_file_path)
try:
yield temp_json_file
finally:
# Make sure that the file was created.
if os.path.isfile(temp_json_file):
os.remove(temp_json_file)
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