Add spec for ruby-grape#1263

spec/grape/api_spec.rb

@@ -567,6 +567,72 @@ def subject.enable_root_route!
       expect(last_response.headers['Content-Type']).to eql 'text/plain'
     end
 
+    describe 'adds an OPTIONS route that' do
+      before do
+        subject.before { header 'X-Custom-Header', 'foo' }
+        subject.get 'example' do
+          'example'
+        end
+        subject.route :any, '*path' do
+          error! :not_found, 404
+        end
+        options '/example'
+      end
+
+      it 'returns a 204' do
+        expect(last_response.status).to eql 204
+      end
+
+      it 'has an empty body' do
+        expect(last_response.body).to be_blank
+      end
+
+      it 'has an Allow header' do
+        expect(last_response.headers['Allow']).to eql 'OPTIONS, GET, HEAD'
+      end
+
+      it 'has a X-Custom-Header' do
+        expect(last_response.headers['X-Custom-Header']).to eql 'foo'
+      end
+
+      it 'has no Content-Type' do
+        expect(last_response.content_type).to be_nil
+      end
+
+      it 'has no Content-Length' do
+        expect(last_response.content_length).to be_nil
+      end
+    end
+
+    describe 'adds a 405 Not Allowed route that' do
+      before do
+        subject.before { header 'X-Custom-Header', 'foo' }
+        subject.post :example do
+          'example'
+        end
+        subject.route :any, '*path' do
+          error! :not_found, 404
+        end
+        get '/example'
+      end
+
+      it 'returns a 405' do
+        expect(last_response.status).to eql 405
+      end
+
+      it 'contains error message in body' do
+        expect(last_response.body).to eq '405 Not Allowed'
+      end
+
+      it 'has an Allow header' do
+        expect(last_response.headers['Allow']).to eql 'OPTIONS, POST'
+      end
+
+      it 'has a X-Custom-Header' do
+        expect(last_response.headers['X-Custom-Header']).to eql 'foo'
+      end
+    end
+
     context 'allows HEAD on a GET request that' do
       before do
         subject.get 'example' do