require 'multi_json'
require 'rspec'

RSpec.configure do |config|
  config.expect_with :rspec do |c|
    c.syntax = :expect
  end
end

def silence_warnings
  old_verbose, $VERBOSE = $VERBOSE, nil
  yield
ensure
  $VERBOSE = old_verbose
end

def macruby?
  defined?(RUBY_ENGINE) && RUBY_ENGINE == 'macruby'
end

def jruby?
  defined?(RUBY_ENGINE) && RUBY_ENGINE == 'jruby'
end

def undefine_constants(*consts)
  values = {}
  consts.each do |const|
    if Object.const_defined?(const)
      values[const] = Object.const_get(const)
      Object.send :remove_const, const
    end
  end

  yield

ensure
  values.each do |const, value|
    Object.const_set const, value
  end
end

def break_requirements
  requirements = MultiJson::REQUIREMENT_MAP
  MultiJson::REQUIREMENT_MAP.each_with_index do |(library, adapter), index|
    MultiJson::REQUIREMENT_MAP[index] = ["foo/#{library}", adapter]
  end

  yield
ensure
  requirements.each_with_index do |(library, adapter), index|
    MultiJson::REQUIREMENT_MAP[index] = [library, adapter]
  end
end

def simulate_no_adapters
  break_requirements do
    undefine_constants :JSON, :Oj, :Yajl, :Gson, :JrJackson do
      yield
    end
  end
end

def get_exception(exception_class = StandardError)
  begin
    yield
  rescue exception_class => exception
    exception
  end
end

def with_default_options
  adapter = MultiJson.adapter
  adapter.load_options = adapter.dump_options = MultiJson.load_options = MultiJson.dump_options = nil
  yield
ensure
  adapter.load_options = adapter.dump_options = MultiJson.load_options = MultiJson.dump_options = nil
end