diff --git a/unit_tests/tests/lua/test_lua_basic.cpp b/unit_tests/tests/lua/test_lua_basic.cpp
index 44e44162e5..5a8cf57c1d 100644
--- a/unit_tests/tests/lua/test_lua_basic.cpp
+++ b/unit_tests/tests/lua/test_lua_basic.cpp
@@ -25,6 +25,16 @@ TEST(LuaBasic, MathLib) {
 	EXPECT_FLOAT_EQ(result, 1.0f);
 }
 
+TEST(LuaBasic, MathLibFloor) {
+	auto script = R"(
+		function testFunc()
+			return math.floor(3.2)
+		end
+	)";
+
+	EXPECT_FLOAT_EQ(testLuaReturnsNumber(script), 3.0f);
+}
+
 TEST(LuaBasic, ReturnsInteger) {
 	auto script = R"(
 						function testFunc()
diff --git a/unit_tests/tests/lua/test_lua_e65.cpp b/unit_tests/tests/lua/test_lua_e65.cpp
index c448610395..87af8ef4fe 100644
--- a/unit_tests/tests/lua/test_lua_e65.cpp
+++ b/unit_tests/tests/lua/test_lua_e65.cpp
@@ -28,3 +28,21 @@ TEST(LuaE65, Rpm) {
 
 	EXPECT_NEAR_M3(testLuaReturnsNumberOrNil(realdata).value_or(0), 845);
 }
+
+TEST(LuaE65, sumChecksum) {
+	// checksum is first byte
+	// id = A8, packet:
+	// 12 AD 05 A0 05 0F 00 02
+
+	const char* realdata = R"(
+
+	function testFunc()
+	canID = 0xA8
+		data = { 0xAD, 0x05, 0xA0, 0x05, 0x0F, 0x00, 0x02 }
+		checksum = data[1] + data[2] + data[3] + data[4] + data[5] + data[6] + data[7] + canID
+		checksum = math.floor (checksum / 0x100) + (checksum & 0xff)
+		return checksum; 
+	end)";
+
+	EXPECT_NEAR_M3(testLuaReturnsNumberOrNil(realdata).value_or(0), 0x12);
+}