collapse two koans into one

lib/koans/16_protocols.ex

@@ -1,45 +1,30 @@
 defmodule Protocols do
   use Koans
 
-  defprotocol School do
-    def enrol(person)
-  end
+  @intro "Protocols"
 
-  defmodule Student do
-    defstruct name: ""
-  end
+  defprotocol School, do: def enrol(person)
 
+  defmodule Student, do: defstruct name: ""
+  defmodule Baker, do: defstruct name: ""
   defmodule Dancer do
     defstruct name: "", dance_style: ""
   end
 
-  defmodule Baker do
-    defstruct name: ""
-  end
-
   defimpl School, for: Student do
-    def enrol(student) do
-      "#{student.name} enrolled at secondary school"
-    end
+    def enrol(student), do: "#{student.name} enrolled at secondary school"
   end
 
   defimpl School, for: Dancer do
-    def enrol(dancer) do
-      "#{dancer.name} enrolled for #{dancer.dance_style}"
-    end
+    def enrol(dancer), do: "#{dancer.name} enrolled for #{dancer.dance_style}"
   end
 
-  defmodule EveningSchool do end
-
   koan "Sharing an interface is the secret at school" do
     student = %Student{name: "Emily"}
-    assert School.enrol(student) == ___
-  end
-
-  koan "Dancers share but belong to a different school" do
     dancer = %Dancer{name: "Darcy", dance_style: "ballet"}
-    assert School.enrol(dancer) == ___
 
+    assert School.enrol(student) == ___
+    assert School.enrol(dancer) == ___
   end
 
   koan "If you don't comply you can't get in" do