テストを検証するユーザーごとに分けた

test/system/home_test.rb

@@ -88,30 +88,33 @@ class HomeTest < ApplicationSystemTestCase
     assert_current_path(/niconico_calendar=#{1.month.ago.strftime('%Y-%m')}/)
   end
 
-  test 'show the grass for student and trainee' do
+  test 'show the grass for student' do
     assert users(:kimura).student?
     visit_with_auth '/', 'kimura'
     assert_selector 'h2.card-header__title', text: '学習時間'
-    logout
+  end
 
+  test 'show the grass for trainee' do
     assert users(:kensyu).trainee?
     visit_with_auth '/', 'kensyu'
     assert_selector 'h2.card-header__title', text: '学習時間'
   end
 
-  test 'not show the grass for mentor, adviser, and admin' do
+  test 'not show the grass for mentor' do
     assert users(:mentormentaro).mentor?
     visit_with_auth '/', 'mentormentaro'
     assert_selector 'h2.page-header__title', text: 'ダッシュボード'
     assert_no_selector 'h2.card-header__title', text: '学習時間'
-    logout
+  end
 
+  test 'not show the grass for adviser' do
     assert users(:advijirou).adviser?
     visit_with_auth '/', 'advijirou'
     assert_selector 'h2.page-header__title', text: 'ダッシュボード'
     assert_no_selector 'h2.card-header__title', text: '学習時間'
-    logout
+  end
 
+  test 'not show the grass for admin' do
     assert users(:komagata).admin?
     visit_with_auth '/', 'komagata'
     assert_selector 'h2.page-header__title', text: 'ダッシュボード'