# File lib/rspec/core/configuration.rb, line 350 def expect_with(*frameworks) modules = frameworks.map do |framework| case framework when :rspec require 'rspec/expectations' self.expecting_with_rspec = true ::RSpec::Matchers when :stdlib require 'test/unit/assertions' ::Test::Unit::Assertions else raise ArgumentError, "#{framework.inspect} is not supported" end end if (modules - @expectation_frameworks).any? assert_no_example_groups_defined(:expect_with) end @expectation_frameworks.clear @expectation_frameworks.push(*modules) end