Basic tests for UsersTab add user button

spec/views/components/pageflow/admin/add_membership_button_if_needed_spec.rb

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+require 'spec_helper'
+
+module Pageflow
+  module Admin
+    describe AddMembershipButtonIfNeeded, type: :view_component do
+      before do
+        helper.extend(ActiveAdmin::ViewHelpers)
+        helper.extend(Pageflow::Admin::MembershipsHelper)
+        allow(helper).to receive(:new_admin_account_membership_path)
+        allow(helper).to receive(:membership_possible_for)
+        allow(helper).to receive(:url_for)
+      end
+
+      it 'renders add user button when account available' do
+        account = create(:account)
+        user_account = create(:account)
+        create(:user, :member, on: user_account)
+        account_manager = create(:user, :manager, on: account)
+        create(:membership,
+               user: account_manager,
+               entity: user_account,
+               role: :manager)
+        sign_in(account_manager)
+
+        render do
+          add_membership_button_if_needed(account_manager, account, 'account')
+        end
+
+        expect(rendered).to have_selector('a', text: 'Add user')
+        expect(rendered).to_not have_selector('a', class: 'disabled')
+      end
+
+      it 'renders disabled add user button when account unavailable' do
+        account = create(:account)
+        create(:user, :member, on: account)
+        account_manager = create(:user, :manager, on: account)
+        sign_in(account_manager)
+
+        render do
+          add_membership_button_if_needed(account_manager, account, 'account')
+        end
+
+        expect(rendered).to have_selector('a', class: 'disabled')
+      end
+    end
+  end
+end