add rspec tests

spec/models/room_spec.rb

@@ -0,0 +1,21 @@
+require "rails_helper"
+
+describe Room, type: :model do
+
+  describe "#owned_by?" do
+    it "should identify correct owner." do
+      room = create(:room)
+      expect(room.owned_by?(room.user)).to eql(true)
+    end
+
+    it "should identify incorrect owner." do
+      room = create(:room)
+      expect(room.owned_by?(create(:user))).to eql(false)
+    end
+
+    it "should return false when user is nil." do
+      room = create(:room)
+      expect(room.owned_by?(nil)).to eql(false)
+    end
+  end
+end