Merge pull request ruby-grape#1320 from dblock/invalid-format-spec

Spec for ruby-grape#1276.

spec/grape/api/invalid_format_spec.rb

@@ -0,0 +1,43 @@
+require 'spec_helper'
+
+describe Grape::Endpoint do
+  subject { Class.new(Grape::API) }
+
+  def app
+    subject
+  end
+
+  before do
+    subject.namespace do
+      format :json
+      content_type :json, 'application/json'
+      params do
+        requires :id, desc: 'Identifier.'
+      end
+      get ':id' do
+        {
+          id: params[:id],
+          format: params[:format]
+        }
+      end
+    end
+  end
+
+  context 'get' do
+    it 'no format' do
+      get '/foo'
+      expect(last_response.status).to eq 200
+      expect(last_response.body).to eq(MultiJson.dump(id: 'foo', format: nil))
+    end
+    it 'json format' do
+      get '/foo.json'
+      expect(last_response.status).to eq 200
+      expect(last_response.body).to eq(MultiJson.dump(id: 'foo', format: 'json'))
+    end
+    it 'invalid format' do
+      get '/foo.invalid'
+      expect(last_response.status).to eq 200
+      expect(last_response.body).to eq(MultiJson.dump(id: 'foo', format: 'invalid'))
+    end
+  end
+end