Add elixir 1.18.0 compatibility

.github/workflows/main.yml

@@ -39,6 +39,8 @@ jobs:
             coverage: true
           - otp: 27.x
             elixir: 1.17.x
+          - otp: 27.x
+            elixir: 1.18.x
     env:
       MIX_ENV: test
     steps:

lib/mimic/module.ex

@@ -1,5 +1,7 @@
 defmodule Mimic.Module do
   alias Mimic.{Cover, Server}
+
+  @elixir_version System.version() |> Float.parse() |> elem(0)
   @moduledoc false
 
   @spec original(module) :: module
@@ -121,29 +123,47 @@ defmodule Mimic.Module do
     module
   end
 
-  defp generate_mimic_struct(module) do
-    if function_exported?(module, :__info__, 1) && module.__info__(:struct) != nil do
-      struct_info =
-        module.__info__(:struct)
-        |> Enum.split_with(& &1.required)
-        |> Tuple.to_list()
-        |> List.flatten()
-
-      required_fields = for %{field: field, required: true} <- struct_info, do: field
-      struct_template = Map.from_struct(module.__struct__())
-
-      struct_params =
-        for %{field: field, required: required} <- struct_info do
-          if required do
-            field
-          else
-            {field, Macro.escape(struct_template[field])}
-          end
+  if @elixir_version >= 1.18 do
+    defp generate_mimic_struct(module) do
+      if function_exported?(module, :__info__, 1) && module.__info__(:struct) != nil do
+        struct_info = module.__info__(:struct)
+
+        struct_template = Map.from_struct(module.__struct__())
+
+        struct_params =
+          for %{field: field} <- struct_info,
+              do: {field, Macro.escape(struct_template[field])}
+
+        quote do
+          defstruct unquote(struct_params)
         end
+      end
+    end
+  else
+    defp generate_mimic_struct(module) do
+      if function_exported?(module, :__info__, 1) && module.__info__(:struct) != nil do
+        struct_info =
+          module.__info__(:struct)
+          |> Enum.split_with(& &1.required)
+          |> Tuple.to_list()
+          |> List.flatten()
+
+        required_fields = for %{field: field, required: true} <- struct_info, do: field
+        struct_template = Map.from_struct(module.__struct__())
+
+        struct_params =
+          for %{field: field, required: required} <- struct_info do
+            if required do
+              field
+            else
+              {field, Macro.escape(struct_template[field])}
+            end
+          end
 
-      quote do
-        @enforce_keys unquote(required_fields)
-        defstruct unquote(struct_params)
+        quote do
+          @enforce_keys unquote(required_fields)
+          defstruct unquote(struct_params)
+        end
       end
     end
   end

test/dsl_test.exs

@@ -2,15 +2,17 @@ defmodule Mimic.DSLTest do
   use ExUnit.Case, async: true
   use Mimic.DSL
 
+  @stub 10
+
   test "basic example" do
-    stub(Calculator.add(_x, _y), do: :stub)
+    stub(Calculator.add(_x, _y), do: @stub)
     expect Calculator.add(x, y), do: x + y
     expect Calculator.mult(x, y), do: x * y
 
     assert Calculator.add(2, 3) == 5
     assert Calculator.mult(2, 3) == 6
 
-    assert Calculator.add(2, 3) == :stub
+    assert Calculator.add(2, 3) == @stub
   end
 
   test "guards on stub" do