Mater does Rspec: `expect.to not_to`

mater_matcher.rb

RSpec::Matchers.define :not_to do
  match { |actual| !actual }
end

RSpec.describe "Mater" do
  specify "says `to not to' to mean false" do
    expect(false).to not_to
    expect(true).not_to not_to
  end
end

# Mater
#   says `to not to' to mean false
#
# Finished in 0.00073 seconds (files took 0.14261 seconds to load)
# 1 example, 0 failures

Test failures are wonderful, too:

  1) Mater says `to not to' to mean false
     Failure/Error: expect(true).to not_to
       expected true to not to