add public activities test

spec/acceptance/activities_spec.rb

+require 'acceptance_helpers'
+require 'shared/contexts'
+
+resource 'Activities' do
+
+  before { 12.times { create(:learning_object) } }
+
+  let(:learning_objects) { LearningObject.all }
+
+  get '/v1/activities' do
+    include_context "authenticate_user"
+
+    before do
+      create(:like, user: @user)
+    end
+
+    example 'Showing all users public activities' do
+      do_request
+      expect(status).to eq(200)
+    end
+  end
+
+end

spec/spec_helper.rb

 require 'devise'
 require 'public_activity/testing'
 
-PublicActivity.enabled = false
+PublicActivity.enabled = true
 # This file was generated by the `rails generate rspec:install` command. Conventionally, all
 # specs live under a `spec` directory, which RSpec adds to the `$LOAD_PATH`.
 # The generated `.rspec` file contains `--require spec_helper` which will cause