Minitest with before_all

spreadsheet_test.rb

require "minitest/autorun"
require "minitest/spec"
require "spreadsheet"

describe 'spreadsheet' do
  def self.before_all
    @doc ||= Spreadsheet.open "spreadsheet.xls"
  end

  before do
    @doc = self.class.before_all
    puts "document object id: #{@doc.object_id}"
  end

  it 'should have the correct number of rows on the first sheet' do
    expect(@doc.worksheet(0).rows.size).must_equal 2047
  end

  it 'should have the correct number of rows on the second sheet' do
    expect(@doc.worksheet(1).rows.size).must_equal 1054
  end

  it 'should have the correct number of rows on the third sheet' do
    expect(@doc.worksheet(2).rows.size).must_equal 451
  end
end