   test "invalid super call" do
     message =
       "nofile:4: no super defined for foo/0 in module Kernel.OverridableOrder.Forwarding. " <>
-      "Overridable functions available are: bar/0"
+        "Overridable functions available are: bar/0"
+
     assert_raise CompileError, message, fn ->
-      Code.eval_string """
+      Code.eval_string("""
       defmodule Kernel.OverridableOrder.Forwarding do
         def bar(), do: 1
         defoverridable bar: 0
         def foo(), do: super()
       end
-      """
-    end
-
-    purge Kernel.OverridableOrder.Forwarding
+      """)
+    end
+
+    purge(Kernel.OverridableOrder.Forwarding)
   end
 
   test "undefined functions can't be marked as overridable" do
     message = "cannot make function foo/2 overridable because it was not defined"
-    assert_raise ArgumentError, message, fn ->
-      Code.eval_string """
+
+    assert_raise ArgumentError, message, fn ->
+      Code.eval_string("""
       defmodule Kernel.OverridableOrder.Foo do
         defoverridable foo: 2
       end
-      """
-    end
-
-    purge Kernel.OverridableOrder.Foo
+      """)
+    end
+
+    purge(Kernel.OverridableOrder.Foo)
   end
 
   test "overrides with behaviour" do

  end

  test "overridable is made concrete if no other is defined" do
    assert Overridable.sample == 1
  end

  test "overridable overridden with super" do
    assert Overridable.with_super == 3
  end

  test "overridable overridden without super" do
    assert Overridable.without_super == :without_super
  end

  test "calling super with multiple args" do

  end

  def super_with_multiple_args(x, y) do
    super(x, y * 2)
  end

  def many_clauses(2) do
