Use a tuple to get indexed access to a arguments

test/ast_mangler_test.exs

@@ -8,6 +8,11 @@ defmodule ASTManglerTest do
     assert {:+, [context: ASTManglerTest, import: Kernel], [1, 37]} == mangled
   end
 
+  test "Work with multiple different replacements" do
+    [koan | _] = SampleKoan.all_koans
+    assert :ok == apply(SampleKoan, koan, [{:multiple, [3,4]}])
+  end
+
   def complex_example do
     [head | tail] = [1,2,3,4]
 

test/sample_koan_test.exs

@@ -0,0 +1,8 @@
+defmodule SampleKoan do
+  use Koans
+
+  koan "thinking more than once" do
+    assert 3 == :__
+    assert 4 == :__
+  end
+end