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# license agreements. See the NOTICE file distributed with
# this work for additional information regarding copyright
# ownership. Elasticsearch B.V. licenses this file to you under
# the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#   http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied.  See the License for the
# specific language governing permissions and limitations
# under the License.

# frozen_string_literal: true

module WithEnv
  def with_env(env)
    current_values = env.keys.each_with_object({}) do |(key, value), current|
      current[key] = ENV.key?(key) ? ENV[value] : :__missing
    end

    env.each_key { |key| ENV[key] = env[key] }

    yield
  ensure
    current_values.each do |key, value|
      case value
      when :__missing
        ENV.delete(key)
      else
        ENV[key] = value
      end
    end
  end
end

RSpec.configure do |config|
  config.include WithEnv
end