RSpec Have HTTP Header Matcher

have_http_header.rb

# frozen_string_literal: true

require 'rspec/expectations'

# Example Usage; expect(response).to have_http_header('Auth-Token')
RSpec::Matchers.define :have_http_header do |expected_header|
  match do |response|
    response.headers.keys.include? expected_header
  end

  failure_message do
    "expected #{expected_header} available on response headers but not exist"
  end
end