Add bip buffer and constexpr hash

src/tests/constexpr_hash.cpp

@@ -0,0 +1,21 @@
+#include "kutil/constexpr_hash.h"
+#include "catch.hpp"
+
+using namespace kutil;
+
+TEST_CASE( "constexpr hash", "[hash]" )
+{
+	const unsigned hash1 = static_cast<unsigned>("hash1!"_h);
+	CHECK(hash1 == 210);
+
+	const unsigned hash2 = static_cast<unsigned>("hash1!"_h);
+	CHECK(hash1 == hash2);
+
+	const unsigned hash3 = static_cast<unsigned>("not hash1!"_h);
+	CHECK(hash1 != hash3);
+	CHECK(hash3 == 37);
+
+	const unsigned hash4 = static_cast<unsigned>("another thing that's longer"_h);
+	CHECK(hash1 != hash4);
+	CHECK(hash4 == 212);
+}