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diff --git a/test/rspamd_cxx_unit_utils.hxx b/test/rspamd_cxx_unit_utils.hxx
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+++ b/test/rspamd_cxx_unit_utils.hxx
@@ -0,0 +1,51 @@
+/*-
+ * Copyright 2021 Vsevolod Stakhov
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/* Detached unit tests for the utils */
+
+#ifndef RSPAMD_RSPAMD_CXX_UNIT_UTILS_HXX
+#define RSPAMD_RSPAMD_CXX_UNIT_UTILS_HXX
+
+#define DOCTEST_CONFIG_IMPLEMENTATION_IN_DLL
+#include "doctest/doctest.h"
+
+#include "libmime/mime_headers.h"
+#include <vector>
+#include <utility>
+#include <string>
+
+TEST_CASE("rspamd_strip_smtp_comments_inplace") {
+	std::vector<std::pair<std::string, std::string>> cases{
+			{"abc", "abc"},
+			{"abc(foo)", "abc"},
+			{"abc(foo()", "abc"},
+			{"abc(foo))", "abc)"},
+			{"abc(foo(bar))", "abc"},
+			{"(bar)abc(foo)", "abc"},
+			{"ab(ololo)c(foo)", "abc"},
+			{"ab(trol\\\1lo)c(foo)", "abc"},
+			{"\\ab(trol\\\1lo)c(foo)", "abc"},
+	};
+
+	for (const auto &c : cases) {
+		auto *cpy = new char[c.first.size()];
+		memcpy(cpy, c.first.data(), c.first.size());
+		auto nlen = rspamd_strip_smtp_comments_inplace(cpy, c.first.size());
+		CHECK(std::string{cpy,nlen} == c.second);
+	}
+}
+
+#endif