1 files changed, 26 insertions, 0 deletions
diff --git a/Examples/test-suite/python/comment_verifier.py b/Examples/test-suite/python/comment_verifier.py
new file mode 100644
index 000000000..653cb4940
--- /dev/null
+++ b/Examples/test-suite/python/comment_verifier.py
@@ -0,0 +1,26 @@
+def check(got, expected, expected_builtin=None):
+  if got is None:  # Absence of comment is equivalent to empty comment.
+      got = ""
+
+  if got != expected:
+    import re
+    p = re.compile(r"^[+-]([^+-].*\S)?(\s+)$", re.M)
+
+    def make_trailing_spaces_visible(str):
+        def replace_trailing_spaces(match):
+            res = match.group(0)
+            spaces = match.group(2)
+            if spaces is not None:
+                res = res + "{+%d trailing spaces}" % len(spaces)
+            return res
+        return re.sub(p, replace_trailing_spaces, str)
+
+    from difflib import unified_diff
+    diff = unified_diff(expected.splitlines(True),
+                        got.splitlines(True), "expected", "got")
+    lines = []
+    for line in diff:
+        line = make_trailing_spaces_visible(line.strip("\r\n"))
+        lines.append(line + "\n")
+
+    raise RuntimeError("Comments don't match:\n" + "".join(lines))