src/lundump.js: Fix reading empty string constants

Closes https://github.com/fengari-lua/fengari-interop/issues/42

1 files changed, 18 insertions, 0 deletions

diff --git a/test/load.test.js b/test/load.test.js
index 3c03eec..d778155 100644
--- a/test/load.test.js
+++ b/test/load.test.js
@@ -43,6 +43,24 @@ test('load', () => {
 });
 
 
+test('undump empty string', () => {
+    let L = lauxlib.luaL_newstate();
+    if (!L) throw Error("failed to create lua state");
+
+    let luaCode = `
+        assert(load(string.dump(function()
+			local str = ""
+			return #str -- something that inspects the string
+        end)))()
+    `;
+    {
+        lualib.luaL_openlibs(L);
+        expect(lauxlib.luaL_loadstring(L, to_luastring(luaCode))).toBe(lua.LUA_OK);
+        lua.lua_call(L, 0, 0);
+    }
+});
+
+
 test('luaL_loadbuffer', () => {
     let L = lauxlib.luaL_newstate();
     if (!L) throw Error("failed to create lua state");