minitest.rb

require 'minitest/autorun'

class Tea
  def initialize(kind)
    @teas = { green: 150 }
    @kind = kind
  end

  def temperature
    @teas[@kind]
  end
end

class TeaTest < Minitest::Unit::TestCase
  def test_green_tea_temperature
    hot_tea = Tea.new :green
    assert(hot_tea.temperature == 150)
  end

  def test_green_tea_temperature2
    hot_tea = Tea.new :green
    assert_equal 150, hot_tea.temperature
  end
end

class Minitest::Spec
  class << self
    alias :context :describe
  end
end

describe Tea do
  context 'Green tea' do
    subject { Tea.new :green }

    it 'temperature should be right' do
      subject.temperature.must_equal 150
    end
  end
end