fix: make TreeMatcher right for case-sensitive worlds

2 files changed, 9 insertions, 2 deletions

diff --git a/coverage/files.py b/coverage/files.py
index 59b2bd61..1cf4b18e 100644
--- a/coverage/files.py
+++ b/coverage/files.py
@@ -216,17 +216,19 @@ class TreeMatcher(object):
 
     """
     def __init__(self, paths):
-        self.paths = list(paths)
+        self.original_paths = list(paths)
+        self.paths = list(map(os.path.normcase, paths))
 
     def __repr__(self):
         return "<TreeMatcher %r>" % self.paths
 
     def info(self):
         """A list of strings for displaying when dumping state."""
-        return self.paths
+        return self.original_paths
 
     def match(self, fpath):
         """Does `fpath` indicate a file in one of our trees?"""
+        fpath = os.path.normcase(fpath)
         for p in self.paths:
             if fpath.startswith(p):
                 if fpath == p:
diff --git a/tests/test_files.py b/tests/test_files.py
index 512e4294..2f1bb83b 100644
--- a/tests/test_files.py
+++ b/tests/test_files.py
@@ -151,16 +151,21 @@ class MatcherTest(CoverageTest):
         assert matches == matcher.match(canonical), msg
 
     def test_tree_matcher(self):
+        case_folding = env.WINDOWS
         matches_to_try = [
             (self.make_file("sub/file1.py"), True),
             (self.make_file("sub/file2.c"), True),
             (self.make_file("sub2/file3.h"), False),
             (self.make_file("sub3/file4.py"), True),
             (self.make_file("sub3/file5.c"), False),
+            (self.make_file("sub4/File5.py"), case_folding),
+            (self.make_file("sub5/file6.py"), case_folding),
         ]
         trees = [
             files.canonical_filename("sub"),
             files.canonical_filename("sub3/file4.py"),
+            files.canonical_filename("sub4/file5.py"),
+            files.canonical_filename("SUB5/file6.py"),
             ]
         tm = TreeMatcher(trees)
         assert tm.info() == trees