1 files changed, 95 insertions, 0 deletions
diff --git a/tools/unittests/test_cmatch.py b/tools/unittests/test_cmatch.py
new file mode 100755
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+++ b/tools/unittests/test_cmatch.py
@@ -0,0 +1,95 @@
+#!/usr/bin/env python3
+# SPDX-License-Identifier: GPL-2.0
+# Copyright(c) 2026: Mauro Carvalho Chehab <mchehab@kernel.org>.
+#
+# pylint: disable=C0413,R0904
+
+
+"""
+Unit tests for kernel-doc CMatch.
+"""
+
+import os
+import re
+import sys
+import unittest
+
+
+# Import Python modules
+
+SRC_DIR = os.path.dirname(os.path.realpath(__file__))
+sys.path.insert(0, os.path.join(SRC_DIR, "../lib/python"))
+
+from kdoc.c_lex import CMatch
+from kdoc.xforms_lists import CTransforms
+from unittest_helper import run_unittest
+
+#
+# Override unittest.TestCase to better compare diffs ignoring whitespaces
+#
+class TestCaseDiff(unittest.TestCase):
+    """
+    Disable maximum limit on diffs and add a method to better
+    handle diffs with whitespace differences.
+    """
+
+    @classmethod
+    def setUpClass(cls):
+        """Ensure that there won't be limit for diffs"""
+        cls.maxDiff = None
+
+
+#
+# Tests doing with different macros
+#
+
+class TestSearch(TestCaseDiff):
+    """
+    Test search mechanism
+    """
+
+    def test_search_acquires_simple(self):
+        line = "__acquires(ctx) foo();"
+        result = ", ".join(CMatch("__acquires").search(line))
+        self.assertEqual(result, "__acquires(ctx)")
+
+    def test_search_acquires_multiple(self):
+        line = "__acquires(ctx) __acquires(other) bar();"
+        result = ", ".join(CMatch("__acquires").search(line))
+        self.assertEqual(result, "__acquires(ctx), __acquires(other)")
+
+    def test_search_acquires_nested_paren(self):
+        line = "__acquires((ctx1, ctx2)) baz();"
+        result = ", ".join(CMatch("__acquires").search(line))
+        self.assertEqual(result, "__acquires((ctx1, ctx2))")
+
+    def test_search_must_hold(self):
+        line = "__must_hold(&lock) do_something();"
+        result = ", ".join(CMatch("__must_hold").search(line))
+        self.assertEqual(result, "__must_hold(&lock)")
+
+    def test_search_must_hold_shared(self):
+        line = "__must_hold_shared(RCU) other();"
+        result = ", ".join(CMatch("__must_hold_shared").search(line))
+        self.assertEqual(result, "__must_hold_shared(RCU)")
+
+    def test_search_no_false_positive(self):
+        line = "call__acquires(foo);  // should stay intact"
+        result = ", ".join(CMatch(r"\b__acquires").search(line))
+        self.assertEqual(result, "")
+
+    def test_search_no_macro_remains(self):
+        line = "do_something_else();"
+        result = ", ".join(CMatch("__acquires").search(line))
+        self.assertEqual(result, "")
+
+    def test_search_no_function(self):
+        line = "something"
+        result = ", ".join(CMatch(line).search(line))
+        self.assertEqual(result, "")
+
+#
+# Run all tests
+#
+if __name__ == "__main__":
+    run_unittest(__file__)