module Minitest::Spec::DSL::InstanceMethods

# File lib/minitest/spec.rb, line 323
def _ value = nil, &block
  Minitest::Expectation.new block || value, self
end

Takes a value or a block and returns a value monad that has all of Expectations methods available to it.

_(1 + 1).must_equal 2

And for blocks:

_ { 1 + "1" }.must_raise TypeError

This method of expectation-based testing is preferable to straight-expectation methods (on Object) because it stores its test context, bypassing our hacky use of thread-local variables.

NOTE: At some point, the methods on Object will be deprecated and then removed.

It is also aliased to value and expect for your aesthetic pleasure:

     _(1 + 1).must_equal 2
 value(1 + 1).must_equal 2
expect(1 + 1).must_equal 2