require_relative './test_helper'

describe Variable do
  before { @variable = Variable.new(1.0) }

  it '#initialize' do
    @variable.must_be_kind_of Struct
    @variable.must_be_instance_of Variable
  end

  it '#value' do
    @variable.value.must_equal 1.0
  end

  it '#to_s' do
    @variable.to_s.must_equal '1.0 variables'
  end

  it '#inspect' do
    @variable.inspect.must_equal '1.0 variables'
  end

  it '#and' do
    0.5.amperes.and(18.ohms).must_equal Volt.new(9.0)
    18.ohms.and(9.volts).must_equal Ampere.new(0.5)
    9.volts.and(0.5.amperes).must_equal Ohm.new(18.0)
  end
end