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diff --git a/vim/bundle/YouCompleteMe/python/ycm/tests/base_test.py b/vim/bundle/YouCompleteMe/python/ycm/tests/base_test.py
new file mode 100644
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+++ b/vim/bundle/YouCompleteMe/python/ycm/tests/base_test.py
@@ -0,0 +1,270 @@
+# coding: utf-8
+#
+# Copyright (C) 2013  Google Inc.
+#
+# This file is part of YouCompleteMe.
+#
+# YouCompleteMe 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.
+#
+# YouCompleteMe 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 YouCompleteMe.  If not, see <http://www.gnu.org/licenses/>.
+
+from __future__ import unicode_literals
+from __future__ import print_function
+from __future__ import division
+from __future__ import absolute_import
+from future import standard_library
+standard_library.install_aliases()
+from builtins import *  # noqa
+
+import contextlib
+from nose.tools import eq_, ok_
+from mock import patch
+
+from ycm.test_utils import MockVimModule
+vim_mock = MockVimModule()
+from ycm import base
+
+
+@contextlib.contextmanager
+def MockCurrentFiletypes( filetypes = [''] ):
+  with patch( 'ycm.vimsupport.CurrentFiletypes', return_value = filetypes ):
+    yield
+
+
+@contextlib.contextmanager
+def MockCurrentColumnAndLineContents( column, line_contents ):
+  with patch( 'ycm.vimsupport.CurrentColumn', return_value = column ):
+    with patch( 'ycm.vimsupport.CurrentLineContents',
+                return_value = line_contents ):
+      yield
+
+
+@contextlib.contextmanager
+def MockTextAfterCursor( text ):
+  with patch( 'ycm.vimsupport.TextAfterCursor', return_value = text ):
+    yield
+
+
+def AdjustCandidateInsertionText_Basic_test():
+  with MockTextAfterCursor( 'bar' ):
+    eq_( [ { 'abbr': 'foobar', 'word': 'foo' } ],
+         base.AdjustCandidateInsertionText( [ 'foobar' ] ) )
+
+
+def AdjustCandidateInsertionText_ParenInTextAfterCursor_test():
+  with MockTextAfterCursor( 'bar(zoo' ):
+    eq_( [ { 'abbr': 'foobar', 'word': 'foo' } ],
+         base.AdjustCandidateInsertionText( [ 'foobar' ] ) )
+
+
+def AdjustCandidateInsertionText_PlusInTextAfterCursor_test():
+  with MockTextAfterCursor( 'bar+zoo' ):
+    eq_( [ { 'abbr': 'foobar', 'word': 'foo' } ],
+         base.AdjustCandidateInsertionText( [ 'foobar' ] ) )
+
+
+def AdjustCandidateInsertionText_WhitespaceInTextAfterCursor_test():
+  with MockTextAfterCursor( 'bar zoo' ):
+    eq_( [ { 'abbr': 'foobar', 'word': 'foo' } ],
+         base.AdjustCandidateInsertionText( [ 'foobar' ] ) )
+
+
+def AdjustCandidateInsertionText_MoreThanWordMatchingAfterCursor_test():
+  with MockTextAfterCursor( 'bar.h' ):
+    eq_( [ { 'abbr': 'foobar.h', 'word': 'foo' } ],
+         base.AdjustCandidateInsertionText( [ 'foobar.h' ] ) )
+
+  with MockTextAfterCursor( 'bar(zoo' ):
+    eq_( [ { 'abbr': 'foobar(zoo', 'word': 'foo' } ],
+         base.AdjustCandidateInsertionText( [ 'foobar(zoo' ] ) )
+
+
+def AdjustCandidateInsertionText_NotSuffix_test():
+  with MockTextAfterCursor( 'bar' ):
+    eq_( [ { 'abbr': 'foofoo', 'word': 'foofoo' } ],
+         base.AdjustCandidateInsertionText( [ 'foofoo' ] ) )
+
+
+def AdjustCandidateInsertionText_NothingAfterCursor_test():
+  with MockTextAfterCursor( '' ):
+    eq_( [ 'foofoo',
+           'zobar' ],
+         base.AdjustCandidateInsertionText( [ 'foofoo',
+                                              'zobar' ] ) )
+
+
+def AdjustCandidateInsertionText_MultipleStrings_test():
+  with MockTextAfterCursor( 'bar' ):
+    eq_( [ { 'abbr': 'foobar', 'word': 'foo' },
+           { 'abbr': 'zobar', 'word': 'zo' },
+           { 'abbr': 'qbar', 'word': 'q' },
+           { 'abbr': 'bar', 'word': '' }, ],
+         base.AdjustCandidateInsertionText( [ 'foobar',
+                                              'zobar',
+                                              'qbar',
+                                              'bar' ] ) )
+
+
+def AdjustCandidateInsertionText_DictInput_test():
+  with MockTextAfterCursor( 'bar' ):
+    eq_( [ { 'abbr': 'foobar', 'word': 'foo' } ],
+         base.AdjustCandidateInsertionText(
+           [ { 'word': 'foobar' } ] ) )
+
+
+def AdjustCandidateInsertionText_DontTouchAbbr_test():
+  with MockTextAfterCursor( 'bar' ):
+    eq_( [ { 'abbr': '1234', 'word': 'foo' } ],
+         base.AdjustCandidateInsertionText(
+           [ { 'abbr': '1234', 'word': 'foobar' } ] ) )
+
+
+def OverlapLength_Basic_test():
+  eq_( 3, base.OverlapLength( 'foo bar', 'bar zoo' ) )
+  eq_( 3, base.OverlapLength( 'foobar', 'barzoo' ) )
+
+
+def OverlapLength_BasicWithUnicode_test():
+  eq_( 3, base.OverlapLength( u'bar fäö', u'fäö bar' ) )
+  eq_( 3, base.OverlapLength( u'zoofäö', u'fäözoo' ) )
+
+
+def OverlapLength_OneCharOverlap_test():
+  eq_( 1, base.OverlapLength( 'foo b', 'b zoo' ) )
+
+
+def OverlapLength_SameStrings_test():
+  eq_( 6, base.OverlapLength( 'foobar', 'foobar' ) )
+
+
+def OverlapLength_Substring_test():
+  eq_( 6, base.OverlapLength( 'foobar', 'foobarzoo' ) )
+  eq_( 6, base.OverlapLength( 'zoofoobar', 'foobar' ) )
+
+
+def OverlapLength_LongestOverlap_test():
+  eq_( 7, base.OverlapLength( 'bar foo foo', 'foo foo bar' ) )
+
+
+def OverlapLength_EmptyInput_test():
+  eq_( 0, base.OverlapLength( '', 'goobar' ) )
+  eq_( 0, base.OverlapLength( 'foobar', '' ) )
+  eq_( 0, base.OverlapLength( '', '' ) )
+
+
+def OverlapLength_NoOverlap_test():
+  eq_( 0, base.OverlapLength( 'foobar', 'goobar' ) )
+  eq_( 0, base.OverlapLength( 'foobar', '(^($@#$#@' ) )
+  eq_( 0, base.OverlapLength( 'foo bar zoo', 'foo zoo bar' ) )
+
+
+def LastEnteredCharIsIdentifierChar_Basic_test():
+  with MockCurrentFiletypes():
+    with MockCurrentColumnAndLineContents( 3, 'abc' ):
+      ok_( base.LastEnteredCharIsIdentifierChar() )
+
+    with MockCurrentColumnAndLineContents( 2, 'abc' ):
+      ok_( base.LastEnteredCharIsIdentifierChar() )
+
+    with MockCurrentColumnAndLineContents( 1, 'abc' ):
+      ok_( base.LastEnteredCharIsIdentifierChar() )
+
+
+def LastEnteredCharIsIdentifierChar_FiletypeHtml_test():
+  with MockCurrentFiletypes( ['html'] ):
+    with MockCurrentColumnAndLineContents( 3, 'ab-' ):
+      ok_( base.LastEnteredCharIsIdentifierChar() )
+
+
+def LastEnteredCharIsIdentifierChar_ColumnIsZero_test():
+  with MockCurrentColumnAndLineContents( 0, 'abc' ):
+    ok_( not base.LastEnteredCharIsIdentifierChar() )
+
+
+def LastEnteredCharIsIdentifierChar_LineEmpty_test():
+  with MockCurrentFiletypes():
+    with MockCurrentColumnAndLineContents( 3, '' ):
+      ok_( not base.LastEnteredCharIsIdentifierChar() )
+
+    with MockCurrentColumnAndLineContents( 0, '' ):
+      ok_( not base.LastEnteredCharIsIdentifierChar() )
+
+
+def LastEnteredCharIsIdentifierChar_NotIdentChar_test():
+  with MockCurrentFiletypes():
+    with MockCurrentColumnAndLineContents( 3, 'ab;' ):
+      ok_( not base.LastEnteredCharIsIdentifierChar() )
+
+    with MockCurrentColumnAndLineContents( 1, ';' ):
+      ok_( not base.LastEnteredCharIsIdentifierChar() )
+
+    with MockCurrentColumnAndLineContents( 3, 'ab-' ):
+      ok_( not base.LastEnteredCharIsIdentifierChar() )
+
+
+def CurrentIdentifierFinished_Basic_test():
+  with MockCurrentFiletypes():
+    with MockCurrentColumnAndLineContents( 3, 'ab;' ):
+      ok_( base.CurrentIdentifierFinished() )
+
+    with MockCurrentColumnAndLineContents( 2, 'ab;' ):
+      ok_( not base.CurrentIdentifierFinished() )
+
+    with MockCurrentColumnAndLineContents( 1, 'ab;' ):
+      ok_( not base.CurrentIdentifierFinished() )
+
+
+def CurrentIdentifierFinished_NothingBeforeColumn_test():
+  with MockCurrentColumnAndLineContents( 0, 'ab;' ):
+    ok_( base.CurrentIdentifierFinished() )
+
+  with MockCurrentColumnAndLineContents( 0, '' ):
+    ok_( base.CurrentIdentifierFinished() )
+
+
+def CurrentIdentifierFinished_InvalidColumn_test():
+  with MockCurrentFiletypes():
+    with MockCurrentColumnAndLineContents( 5, '' ):
+      ok_( not base.CurrentIdentifierFinished() )
+
+    with MockCurrentColumnAndLineContents( 5, 'abc' ):
+      ok_( not base.CurrentIdentifierFinished() )
+
+
+def CurrentIdentifierFinished_InMiddleOfLine_test():
+  with MockCurrentFiletypes():
+    with MockCurrentColumnAndLineContents( 4, 'bar.zoo' ):
+      ok_( base.CurrentIdentifierFinished() )
+
+    with MockCurrentColumnAndLineContents( 4, 'bar(zoo' ):
+      ok_( base.CurrentIdentifierFinished() )
+
+    with MockCurrentColumnAndLineContents( 4, 'bar-zoo' ):
+      ok_( base.CurrentIdentifierFinished() )
+
+
+def CurrentIdentifierFinished_Html_test():
+  with MockCurrentFiletypes( ['html'] ):
+    with MockCurrentColumnAndLineContents( 4, 'bar-zoo' ):
+      ok_( not base.CurrentIdentifierFinished() )
+
+
+def CurrentIdentifierFinished_WhitespaceOnly_test():
+  with MockCurrentFiletypes():
+    with MockCurrentColumnAndLineContents( 1, '\n' ):
+      ok_( base.CurrentIdentifierFinished() )
+
+    with MockCurrentColumnAndLineContents( 3, '\n    ' ):
+      ok_( base.CurrentIdentifierFinished() )
+
+    with MockCurrentColumnAndLineContents( 3, '\t\t\t\t' ):
+      ok_( base.CurrentIdentifierFinished() )