重複の可能性:
rspec - assert_equal を使用したこの属性比較は、ubuntu のみで同じ場合に失敗するのはなぜですか?
Ruby: 1.9.3-p194  
Rails: 3.2.8  
Ubuntu: 12.04
テストには多くのセットアップがあり、最終的には次のようになります。
assert_equal @iep_service.attributes, IepService.first.attributes
Mac では動作しますが、ubuntu では次のように失敗します。
  2) Iep Service Spreadsheet A typical district With pre-existing students And a pre-existing Iep Service for one of those students And an Iep S[52/427$
SV Prevent importing
     Failure/Error: assert_equal @iep_service.attributes, IepService.first.attributes
     MiniTest::Assertion:
       <{"id"=>212,
        "duration"=>30,
        "frequency"=>3,
        "period"=>"week",
        "group_size"=>"group",
        "location"=>nil,
        "service"=>nil,
        "area_of_need"=>"speech",
        "created_at"=>Wed, 24 Oct 2012 18:59:47 UTC +00:00,
        "updated_at"=>Wed, 24 Oct 2012 18:59:47 UTC +00:00,
        "therapist_id"=>nil,
        "start_date"=>nil,
        "end_date"=>nil,
        "student_id"=>233,
        "adhoc"=>false}> expected but was
       <{"id"=>212,
        "duration"=>30,
        "frequency"=>3,
        "period"=>"week",
        "group_size"=>"group",
        "location"=>nil,
        "service"=>nil,
        "area_of_need"=>"speech",
        "created_at"=>Wed, 24 Oct 2012 18:59:47 UTC +00:00,
        "updated_at"=>Wed, 24 Oct 2012 18:59:47 UTC +00:00,
        "therapist_id"=>nil,
        "start_date"=>nil,
        "end_date"=>nil,
        "student_id"=>233,
        "adhoc"=>false}>.
     # (eval):2:in `assert_equal'
     # ./spec/models/iep_service_spreadsheet_spec.rb:71:in `block (6 levels) in <top (required)>'
それが役立つ場合、完全なソースは次のとおりです。
context "A typical district" do
  before(:each) { set_up_district }
  context "With pre-existing students" do
    before(:each) { StudentSpreadsheet.new(@district, open_spec_fixture_file('sample-students.csv')) }
    context "And a pre-existing Iep Service for one of those students" do
      before(:each) { @iep_service = FactoryGirl.create(:iep_service, :student => @district.students.first) }
      context "And an Iep Service CSV" do
        before(:each) { @spreadsheet = IepServiceSpreadsheet.new(@district, open_spec_fixture_file('sample-ieps.c    sv')) }
        specify "Prevent importing" do
          # Leave database untouched
          assert_equal 1, IepService.count
          assert_equal @iep_service.attributes, IepService.first.attributes
          # Provide error report
          assert @spreadsheet.error_report.any?
        end
      end
    end
  end
end