Improve FunctionSelector helpers

test/libsolutil/FunctionSelector.cpp

@@ -0,0 +1,53 @@
+/*
+	This file is part of solidity.
+
+	solidity is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	solidity is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
+*/
+/**
+ * Unit tests for FunctionSelector.
+ */
+
+#include <libsolutil/FunctionSelector.h>
+
+#include <boost/test/unit_test.hpp>
+
+#include <cstdint>
+#include <sstream>
+
+using namespace std;
+
+namespace solidity::util::test
+{
+
+BOOST_AUTO_TEST_SUITE(FunctionSelectorTest)
+
+BOOST_AUTO_TEST_CASE(conversions)
+{
+	BOOST_CHECK_EQUAL(
+		util::selectorFromSignatureH32("test()"),
+		util::FixedHash<4>(0xf8a8fd6d)
+	);
+	BOOST_CHECK_EQUAL(
+		util::selectorFromSignatureU32("test()"),
+		0xf8a8fd6d
+	);
+	BOOST_CHECK_EQUAL(
+		util::selectorFromSignatureU256("test()"),
+		u256("0xf8a8fd6d00000000000000000000000000000000000000000000000000000000")
+	);
+}
+
+BOOST_AUTO_TEST_SUITE_END()
+
+}