Return tuple not list

Author: RoyalIcing

lib/components_guide/rustler/math.ex

@@ -29,7 +29,7 @@ defmodule ComponentsGuide.Rustler.Math do
   def wasm_example(source, f, a), do: wasm_example_1_i32(source, f, a)
   def wasm_example(source, f, a, b), do: wasm_example_2_i32(source, f, a, b)
 
-  def wasm_buffer(source, f, a, b), do: wasm_buffer_2_i32(source, f, a, b)
+  def wasm_buffer(source, f, a, b), do: wasm_buffer_2_i32(source, f, a, b) |> List.to_tuple()
   def wasm_string(source, f, a, b), do: wasm_string_2_i32(source, f, a, b)
 
   defp error, do: :erlang.nif_error(:nif_not_loaded)

test/components_guide/rustler/math_test.exs

@@ -107,7 +107,7 @@ defmodule ComponentsGuide.Rustler.MathTest do
     )
     """
 
-    assert Math.wasm_buffer(wasm_source, "main", 0, 0) == [256, 30]
+    assert Math.wasm_buffer(wasm_source, "main", 0, 0) == {256, 30}
     assert Math.wasm_string(wasm_source, "main", 0, 0) == "Know the length of this string"
   end