add tests for known issues with snapshot

tests/test_snapshot_diff.py

@@ -0,0 +1,128 @@
+# -*- coding: utf-8 -*-
+#
+# Copyright 2014 Thomas Amland <[email protected]>
+#
+# 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.
+
+import os
+import pytest
+from functools import partial
+from .shell import mkdtemp, mkdir, touch, mv
+from watchdog.utils.dirsnapshot import DirectorySnapshot
+from watchdog.utils.dirsnapshot import DirectorySnapshotDiff
+from watchdog.utils import platform
+
+
+skip_if_windows = pytest.mark.skipif(platform.is_windows(),
+                      reason="Can't detect moves on windows file systems")
+
+
+@pytest.fixture()
+def tmpdir():
+    return mkdtemp()
+
+
+@pytest.fixture()
+def p(tmpdir, *args):
+    """
+    Convenience function to join the temporary directory path
+    with the provided arguments.
+    """
+    return partial(os.path.join, tmpdir)
+
+
+def test_move_to(p):
+    mkdir(p('dir1'))
+    mkdir(p('dir2'))
+    touch(p('dir1', 'a'))
+    ref = DirectorySnapshot(p('dir2'))
+    mv(p('dir1/a'), p('dir2/b'))
+    diff = DirectorySnapshotDiff(ref, DirectorySnapshot(p('dir2')))
+    assert diff.files_created == [p('dir2/b')]
+
+
+def test_move_from(p):
+    mkdir(p('dir1'))
+    mkdir(p('dir2'))
+    touch(p('dir1', 'a'))
+    ref = DirectorySnapshot(p('dir1'))
+    mv(p('dir1/a'), p('dir2/b'))
+    diff = DirectorySnapshotDiff(ref, DirectorySnapshot(p('dir1')))
+    assert diff.files_deleted == [p('dir1/a')]
+
+
+@pytest.mark.skipif(not platform.is_windows(), reason="Should detect moves instead")
+def test_move_on_windows(p):
+    touch(p('a'))
+    ref = DirectorySnapshot(p(''))
+    mv(p('a'), p('b'))
+    diff = DirectorySnapshotDiff(ref, DirectorySnapshot(p('')))
+    assert diff.files_created == [p('b')]
+    assert diff.files_deleted == [p('a')]
+
+
+@skip_if_windows
+def test_move_internal(p):
+    mkdir(p('dir1'))
+    mkdir(p('dir2'))
+    touch(p('dir1', 'a'))
+    ref = DirectorySnapshot(p(''))
+    mv(p('dir1/a'), p('dir2/b'))
+    diff = DirectorySnapshotDiff(ref, DirectorySnapshot(p('')))
+    assert diff.files_moved == [(p('dir1/a'), p('dir2/b'))]
+    assert diff.files_created == []
+    assert diff.files_deleted == []
+    assert diff.files_modified == []
+
+
+@skip_if_windows
+def test_move_replace(p):
+    mkdir(p('dir1'))
+    mkdir(p('dir2'))
+    touch(p('dir1', 'a'))
+    touch(p('dir1', 'b'))
+    ref = DirectorySnapshot(p(''))
+    mv(p('dir1/a'), p('dir2/b'))
+    diff = DirectorySnapshotDiff(ref, DirectorySnapshot(p('')))
+    assert diff.files_moved == [(p('dir1/a'), p('dir2/b'))]
+    assert diff.files_deleted == [p('dir2/b')]
+    assert diff.files_created == []
+    assert diff.files_modified == []
+
+
+def test_dir_modify_on_create(p):
+    ref = DirectorySnapshot(p(''))
+    touch(p('a'))
+    diff = DirectorySnapshotDiff(ref, DirectorySnapshot(p('')))
+    assert diff.dirs_modified == [p('')]
+
+
+def test_dir_modify_on_move(p):
+    mkdir(p('dir1'))
+    mkdir(p('dir2'))
+    touch(p('dir1', 'a'))
+    ref = DirectorySnapshot(p(''))
+    mv(p('dir1/a'), p('dir2/b'))
+    diff = DirectorySnapshotDiff(ref, DirectorySnapshot(p('')))
+    assert set(diff.dirs_modified) == set([p('dir1'), p('dir2')])
+
+
+@skip_if_windows
+def test_detect_modify_on_moved(p):
+    touch(p('a'))
+    ref = DirectorySnapshot(p(''))
+    touch(p('a'))
+    mv(p('a'), p('b'))
+    diff = DirectorySnapshotDiff(ref, DirectorySnapshot(p('')))
+    assert diff.files_moved == [(p('a'), p('b'))]
+    assert diff.files_modified == [p('b')]