Then(/^response array should contains elements like:$/) do |string|
  src = JSON.parse(string).first
  array = JSON.parse(last_response.body)
  array.each do |e|
    src.each do |key, value|
      assert e.key?(key), "Element #{e.inspect} has no key '#{key}'"
    end
  end
end

Then(/^response array should be empty$/) do
  array = JSON.parse(last_response.body)
  assert array.empty?, "Array is not empty"
end