Don't put your tests in modules

test.rb

class X
  def x
    "X"
  end
end

module Y
  class X
    def x
      "Y::X"
    end
  end
end

# Let's not put our tests in modules in an effort to write less code

# UNEXPECTED

module Test
  p X.new.x
  # "X"
  module Y
    class TheTest
      p X.new.x
      # NOT WHAT YOU EXPECTED
      # "X"
    end
  end
end

# BETTER - be explicit about namespacing

class TheTest
  p X.new.x
  # "X"
  p Y::X.new.x
  # "Y::X"
end