Remember registered schemes.

spec/api/protocol.coffee

@@ -0,0 +1,15 @@
+assert = require 'assert'
+protocol = require('remote').require 'protocol'
+
+describe 'protocol API', ->
+  describe 'protocol.registerProtocol', ->
+    it 'throws error when scheme is already registered', ->
+      register = -> protocol.registerProtocol('test', ->)
+      register()
+      assert.throws register, /The scheme is already registered/
+      protocol.unregisterProtocol 'test'
+
+  describe 'protocol.unregisterProtocol', ->
+    it 'throws error when scheme does not exist', ->
+      unregister = -> protocol.unregisterProtocol 'test'
+      assert.throws unregister, /The scheme has not been registered/