Add argument to koan to allow it to be tested

test/ast_mangler_test.exs

@@ -0,0 +1,35 @@
+defmodule ASTManglerTest do
+  use ExUnit.Case, async: true
+
+  test "simple replacement" do
+    ast = quote do: 1 + :__
+
+    mangled = ASTMangler.expand(ast, 37)
+    assert {:+, [context: ASTManglerTest, import: Kernel], [1, 37]} == mangled
+  end
+
+  def complex_example do
+    [head | tail] = [1,2,3,4]
+
+    assert head == 1
+    assert tail == [2,3,4]
+  end
+
+  def foo(answer) do
+    if answer == :yes do
+      :bar
+    else
+      :batz
+    end
+  end
+
+  test "something" do
+    n = 1
+  end
+
+  test "complex example" do
+    ast = [do: {:assert, [line: 5], [{:==, [line: 5], [true, :__]}]}]
+
+    assert [do: {:assert, [line: 5], [{:==, [line: 5], [true, true]}]}] == ASTMangler.expand(ast, true)
+  end
+end

test/power_test.exs

@@ -0,0 +1,9 @@
+defmodule PowerTest do
+  use ExUnit.Case
+
+  test "something" do
+    [first | _] = Equalities.all_koans
+
+    assert :passed == Runner.test_single_koan(Equalities, first, true)
+  end
+end