Shouldify MiniTest

foo.rb

class Foo
  def bar
    "bar"
  end
  def baz
    "baz"
  end
end

foo_spec.rb

require_relative "spec_helper"
require_relative "foo"

describe Foo do
  it "knows how to bar" do
    Foo.new.bar.should_equal "bar"
  end
  it "knows how to baz" do
    Foo.new.baz.should_equal "baz"
  end
end

output

$ ruby foo_spec.rb 
Run options: --seed 56769

# Running tests:

..

Finished tests in 0.000467s, 4282.6552 tests/s, 4282.6552 assertions/s.

2 tests, 2 assertions, 0 failures, 0 errors, 0 skips

spec_helper.rb

require "minitest/autorun"

module MiniTest::Expectations
  def self.shouldify_methods! pattern, replacement
    public_instance_methods.grep(pattern).each do |action|
      shouldify_action = action.to_s.sub(pattern, replacement).to_sym
      alias_method shouldify_action, action
    end
  end
end

class MiniTest::Spec < MiniTest::Unit::TestCase
  def self.shouldify!
    MiniTest::Expectations.shouldify_methods! /^must_/, "should_"
    MiniTest::Expectations.shouldify_methods! /^wont_/, "should_not_"
  end
end

MiniTest::Spec.shouldify!