adds time limit between notifications

spec/models/proposal_notification_spec.rb

@@ -22,4 +22,38 @@ describe ProposalNotification do
     expect(notification).to_not be_valid
   end
 
+  describe "minimum interval between notifications" do
+
+    before(:each) do
+      Setting[:proposal_notification_minimum_interval_in_days] = 3
+    end
+
+    it "should not be valid if below minium interval" do
+      proposal = create(:proposal)
+
+      notification1 = create(:proposal_notification, proposal: proposal)
+      notification2 = build(:proposal_notification, proposal: proposal)
+
+      proposal.reload
+      expect(notification2).to_not be_valid
+    end
+
+    it "should be valid if notifications above minium interval" do
+      proposal = create(:proposal)
+
+      notification1 = create(:proposal_notification, proposal: proposal, created_at: 4.days.ago)
+      notification2 = build(:proposal_notification, proposal: proposal)
+
+      proposal.reload
+      expect(notification2).to be_valid
+    end
+
+    it "should be valid if no notifications sent" do
+      notification1 = build(:proposal_notification)
+
+      expect(notification1).to be_valid
+    end
+
+  end
+
 end