Add flagging/unflagging rspec

spec/features/proposals_spec.rb

@@ -1244,6 +1244,34 @@ feature 'Proposals' do
     expect(Flag.flagged?(user, proposal)).to_not be
   end
 
+  scenario 'Flagging/Unflagging AJAX', :js do
+    user = create(:user)
+    proposal = create(:proposal)
+
+    login_as(user)
+    visit proposal_path(proposal)
+
+    # Flagging
+    within "#proposal_#{proposal.id}" do
+      page.find("#flag-expand-proposal-#{proposal.id}").click
+      page.find("#flag-proposal-#{proposal.id}").click
+
+      expect(page).to have_css("#unflag-expand-proposal-#{proposal.id}")
+    end
+
+    expect(Flag.flagged?(user, proposal)).to be
+
+    # Unflagging
+    within "#proposal_#{proposal.id}" do
+      page.find("#unflag-expand-proposal-#{proposal.id}").click
+      page.find("#unflag-proposal-#{proposal.id}").click
+
+      expect(page).to have_css("#flag-expand-proposal-#{proposal.id}")
+    end
+
+    expect(Flag.flagged?(user, proposal)).to_not be
+  end
+
   it_behaves_like "followable", "proposal", "proposal_path", { "id": "id" }
 
   it_behaves_like "documentable", "proposal", "proposal_path", { "id": "id" }