Update test.lua polyfill

tests.lua

@@ -1,32 +1,7 @@
--- This library targets Lua 5.1. To run the tests using Lua 5.4, the following functions are needed.
-unpack = unpack or table.unpack
-math.frexp = frexp or function(num)
-    if num == math.huge then return num end
-    local fraction, exponent = num, 0
-    if fraction ~= 0 then
-        while fraction >= 1 do
-            fraction = fraction / 2
-            exponent = exponent + 1
-        end
-        while fraction < 0.5 do
-            fraction = fraction * 2
-            exponent = exponent - 1
-        end
-    end
-    return fraction, exponent
-end
-math.ldexp = math.ldexp or function(m, e)
-    return m * 2 ^ e
-end
-
 local LibSerialize = LibStub and LibStub:GetLibrary("LibSerialize") or require("LibSerialize")
 
-local pairs = pairs
-local type = type
-local tostring = tostring
-local assert = assert
+-- Compatibility with Lua 5.4
 local unpack = unpack or table.unpack
-local pcall = pcall
 
 function LibSerialize:RunTests()
     --[[---------------------------------------------------------------------------