class Foo
  def division(number1, number2)
    result = 0

    begin
      result = number1 / number2
    rescue ZeroDivisionError
      puts 'Error'
    ensure
      return "Result: #{result}"
    end
  end
end

describe Foo do
  before do
    @math = Foo.new
  end

  it 'shold returnresult if error catched' do
    expect(@math.division(2, 0)).to eq "Result: 0"
  end

  it 'shoul return result of division' do
    expect(@math.division(4, 2)).to eq "Result: 2"
  end
end