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#!/usr/bin/env python
#
# Copyright 2009 The Closure Library Authors. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS-IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Unit test for depstree."""
__author__ = 'nnaze@google.com (Nathan Naze)'
import unittest
import depstree
def _GetProvides(sources):
"""Get all namespaces provided by a collection of sources."""
provides = set()
for source in sources:
provides.update(source.provides)
return provides
class MockSource(object):
"""Mock Source file."""
def __init__(self, provides, requires):
self.provides = set(provides)
self.requires = set(requires)
def __repr__(self):
return 'MockSource %s' % self.provides
class DepsTreeTestCase(unittest.TestCase):
"""Unit test for DepsTree. Tests several common situations and errors."""
def AssertValidDependencies(self, deps_list):
"""Validates a dependency list.
Asserts that a dependency list is valid: For every source in the list,
ensure that every require is provided by a source earlier in the list.
Args:
deps_list: A list of sources that should be in dependency order.
"""
for i in range(len(deps_list)):
source = deps_list[i]
previous_provides = _GetProvides(deps_list[:i])
for require in source.requires:
self.assertTrue(
require in previous_provides,
'Namespace "%s" not provided before required by %s' % (
require, source))
def testSimpleDepsTree(self):
a = MockSource(['A'], ['B', 'C'])
b = MockSource(['B'], [])
c = MockSource(['C'], ['D'])
d = MockSource(['D'], ['E'])
e = MockSource(['E'], [])
tree = depstree.DepsTree([a, b, c, d, e])
self.AssertValidDependencies(tree.GetDependencies('A'))
self.AssertValidDependencies(tree.GetDependencies('B'))
self.AssertValidDependencies(tree.GetDependencies('C'))
self.AssertValidDependencies(tree.GetDependencies('D'))
self.AssertValidDependencies(tree.GetDependencies('E'))
def testCircularDependency(self):
# Circular deps
a = MockSource(['A'], ['B'])
b = MockSource(['B'], ['C'])
c = MockSource(['C'], ['A'])
tree = depstree.DepsTree([a, b, c])
self.assertRaises(depstree.CircularDependencyError,
tree.GetDependencies, 'A')
def testRequiresUndefinedNamespace(self):
a = MockSource(['A'], ['B'])
b = MockSource(['B'], ['C'])
c = MockSource(['C'], ['D']) # But there is no D.
def MakeDepsTree():
return depstree.DepsTree([a, b, c])
self.assertRaises(depstree.NamespaceNotFoundError, MakeDepsTree)
def testDepsForMissingNamespace(self):
a = MockSource(['A'], ['B'])
b = MockSource(['B'], [])
tree = depstree.DepsTree([a, b])
# There is no C.
self.assertRaises(depstree.NamespaceNotFoundError,
tree.GetDependencies, 'C')
def testMultipleRequires(self):
a = MockSource(['A'], ['B'])
b = MockSource(['B'], ['C'])
c = MockSource(['C'], [])
d = MockSource(['D'], ['B'])
tree = depstree.DepsTree([a, b, c, d])
self.AssertValidDependencies(tree.GetDependencies(['D', 'A']))
if __name__ == '__main__':
unittest.main()
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