1 files changed, 122 insertions, 0 deletions
diff --git a/tests/check_case_conflict_test.py b/tests/check_case_conflict_test.py
new file mode 100644
index 0000000..d9211b5
--- /dev/null
+++ b/tests/check_case_conflict_test.py
@@ -0,0 +1,122 @@
+import sys
+
+import pytest
+
+from pre_commit_hooks.check_case_conflict import find_conflicting_filenames
+from pre_commit_hooks.check_case_conflict import main
+from pre_commit_hooks.check_case_conflict import parents
+from pre_commit_hooks.util import cmd_output
+from testing.util import git_commit
+
+skip_win32 = pytest.mark.skipif(
+    sys.platform == 'win32',
+    reason='case conflicts between directories and files',
+)
+
+
+def test_parents():
+    assert set(parents('a')) == set()
+    assert set(parents('a/b')) == {'a'}
+    assert set(parents('a/b/c')) == {'a/b', 'a'}
+    assert set(parents('a/b/c/d')) == {'a/b/c', 'a/b', 'a'}
+
+
+def test_nothing_added(temp_git_dir):
+    with temp_git_dir.as_cwd():
+        assert find_conflicting_filenames(['f.py']) == 0
+
+
+def test_adding_something(temp_git_dir):
+    with temp_git_dir.as_cwd():
+        temp_git_dir.join('f.py').write("print('hello world')")
+        cmd_output('git', 'add', 'f.py')
+
+        assert find_conflicting_filenames(['f.py']) == 0
+
+
+def test_adding_something_with_conflict(temp_git_dir):
+    with temp_git_dir.as_cwd():
+        temp_git_dir.join('f.py').write("print('hello world')")
+        cmd_output('git', 'add', 'f.py')
+        temp_git_dir.join('F.py').write("print('hello world')")
+        cmd_output('git', 'add', 'F.py')
+
+        assert find_conflicting_filenames(['f.py', 'F.py']) == 1
+
+
+@skip_win32  # pragma: win32 no cover
+def test_adding_files_with_conflicting_directories(temp_git_dir):
+    with temp_git_dir.as_cwd():
+        temp_git_dir.mkdir('dir').join('x').write('foo')
+        temp_git_dir.mkdir('DIR').join('y').write('foo')
+        cmd_output('git', 'add', '-A')
+
+        assert find_conflicting_filenames([]) == 1
+
+
+@skip_win32  # pragma: win32 no cover
+def test_adding_files_with_conflicting_deep_directories(temp_git_dir):
+    with temp_git_dir.as_cwd():
+        temp_git_dir.mkdir('x').mkdir('y').join('z').write('foo')
+        temp_git_dir.join('X').write('foo')
+        cmd_output('git', 'add', '-A')
+
+        assert find_conflicting_filenames([]) == 1
+
+
+@skip_win32  # pragma: win32 no cover
+def test_adding_file_with_conflicting_directory(temp_git_dir):
+    with temp_git_dir.as_cwd():
+        temp_git_dir.mkdir('dir').join('x').write('foo')
+        temp_git_dir.join('DIR').write('foo')
+        cmd_output('git', 'add', '-A')
+
+        assert find_conflicting_filenames([]) == 1
+
+
+def test_added_file_not_in_pre_commits_list(temp_git_dir):
+    with temp_git_dir.as_cwd():
+        temp_git_dir.join('f.py').write("print('hello world')")
+        cmd_output('git', 'add', 'f.py')
+
+        assert find_conflicting_filenames(['g.py']) == 0
+
+
+def test_file_conflicts_with_committed_file(temp_git_dir):
+    with temp_git_dir.as_cwd():
+        temp_git_dir.join('f.py').write("print('hello world')")
+        cmd_output('git', 'add', 'f.py')
+        git_commit('-m', 'Add f.py')
+
+        temp_git_dir.join('F.py').write("print('hello world')")
+        cmd_output('git', 'add', 'F.py')
+
+        assert find_conflicting_filenames(['F.py']) == 1
+
+
+@skip_win32  # pragma: win32 no cover
+def test_file_conflicts_with_committed_dir(temp_git_dir):
+    with temp_git_dir.as_cwd():
+        temp_git_dir.mkdir('dir').join('x').write('foo')
+        cmd_output('git', 'add', '-A')
+        git_commit('-m', 'Add f.py')
+
+        temp_git_dir.join('DIR').write('foo')
+        cmd_output('git', 'add', '-A')
+
+        assert find_conflicting_filenames([]) == 1
+
+
+def test_integration(temp_git_dir):
+    with temp_git_dir.as_cwd():
+        assert main(argv=[]) == 0
+
+        temp_git_dir.join('f.py').write("print('hello world')")
+        cmd_output('git', 'add', 'f.py')
+
+        assert main(argv=['f.py']) == 0
+
+        temp_git_dir.join('F.py').write("print('hello world')")
+        cmd_output('git', 'add', 'F.py')
+
+        assert main(argv=['F.py']) == 1