test(express): add failing test cases for Express middleware

src/express/index.spec.js

@@ -4,4 +4,22 @@ describe('graffiti express', function() {
 
   var express = require('./');
 
+  it('checks for required options');
+
+  it('creates the schema');
+
+  describe('requested url starts with prefix', function() {
+
+    it('returns with proper results');
+
+    it('returns with an error');
+
+  });
+
+  describe('requested url does not start with prefix', function() {
+
+    it('calls the next middleware');
+
+  });
+
 });