[#708] Adding tests exposing the erroneous behavior

test/unit/journal_test.rb

@@ -115,4 +115,29 @@ class JournalTest < ActiveSupport::TestCase
     assert_equal "Test setting fields on Journal from Issue", @issue.last_journal.notes
     assert_equal @issue.author, @issue.last_journal.user
   end
+
+  test "subclasses of journaled models should have journal of parent type" do
+    Ticket = Class.new(Issue)
+
+    project = Project.generate!
+    ticket = Ticket.new do |t|
+      t.project = project
+      t.subject = "Test initial journal"
+      t.tracker = project.trackers.first
+      t.author = User.generate!
+      t.description = "Some content"
+    end
+
+    begin
+      oldstdout = $stdout
+      $stdout = StringIO.new
+      ticket.save!
+      assert $stdout.string.empty?, "No errors should be logged to stdout."
+    ensure
+      $stdout = oldstdout
+    end
+
+    journal = ticket.journals.first
+    assert_equal IssueJournal, journal.class
+  end
 end