diff --git a/spec/models/ticket_spec.rb b/spec/models/ticket_spec.rb
index 01f501045..2f7880355 100644
--- a/spec/models/ticket_spec.rb
+++ b/spec/models/ticket_spec.rb
@@ -259,8 +259,8 @@ RSpec.describe Ticket, type: :model do
 
   describe 'Attributes:' do
     describe '#state' do
-      context 'for brand new tickets' do
-        context 'when a non-customer article is added' do
+      context 'when originally "new"' do
+        context 'and a non-customer article is added' do
           let(:article) { create(:ticket_article, ticket: ticket, sender_name: 'Agent') }
 
           it 'switches to "open"' do
@@ -268,6 +268,18 @@ RSpec.describe Ticket, type: :model do
           end
         end
       end
+
+      context 'when originally "closed"' do
+        before { ticket.update(state: Ticket::State.find_by(name: 'closed')) }
+
+        context 'when a non-customer article is added' do
+          let(:article) { create(:ticket_article, ticket: ticket, sender_name: 'Agent') }
+
+          it 'stays "closed"' do
+            expect { article }.not_to change { ticket.state.name }
+          end
+        end
+      end
     end
 
     describe '#pending_time' do
@@ -472,5 +484,4 @@ RSpec.describe Ticket, type: :model do
       end
     end
   end
-
 end
diff --git a/test/unit/ticket_state_change_test.rb b/test/unit/ticket_state_change_test.rb
deleted file mode 100644
index 5c545587f..000000000
--- a/test/unit/ticket_state_change_test.rb
+++ /dev/null
@@ -1,122 +0,0 @@
-require 'test_helper'
-
-class TicketStateChangeTest < ActiveSupport::TestCase
-
-  test 'check if after reply ticket is open' do
-
-    ticket1 = Ticket.create!(
-      title:         'com test 1',
-      group:         Group.lookup(name: 'Users'),
-      customer_id:   2,
-      state:         Ticket::State.lookup(name: 'new'),
-      priority:      Ticket::Priority.lookup(name: '2 normal'),
-      updated_by_id: 1,
-      created_by_id: 1,
-    )
-    assert(ticket1, 'ticket created')
-
-    article1 = Ticket::Article.create!(
-      ticket_id:     ticket1.id,
-      from:          'some_customer_com-1@example.com',
-      to:            'some_zammad_com-1@example.com',
-      subject:       'com test 1',
-      message_id:    'some@id_com_1',
-      body:          'some message 123',
-      internal:      false,
-      sender:        Ticket::Article::Sender.find_by(name: 'Customer'),
-      type:          Ticket::Article::Type.find_by(name: 'email'),
-      updated_by_id: 1,
-      created_by_id: 1,
-    )
-
-    Observer::Transaction.commit
-    Scheduler.worker(true)
-
-    ticket1.reload
-    assert_equal('new', ticket1.state.name)
-
-    ticket1.with_lock do
-      ticket1.update!(state_id: Ticket::State.find_by(name: 'new').id)
-      article2 = Ticket::Article.create!(
-        ticket_id:     ticket1.id,
-        from:          'some_zammad_com-1@example.com',
-        to:            'some_customer_com-1@example.com',
-        subject:       'com test 1',
-        message_id:    'some@id_com_2',
-        body:          'some message 123',
-        internal:      false,
-        sender:        Ticket::Article::Sender.find_by(name: 'Agent'),
-        type:          Ticket::Article::Type.find_by(name: 'email'),
-        updated_by_id: 1,
-        created_by_id: 1,
-      )
-    end
-
-    Observer::Transaction.commit
-    Scheduler.worker(true)
-
-    ticket1.reload
-    assert_equal('open', ticket1.state.name)
-
-  end
-
-  test 'check if after reply ticket is closed' do
-
-    ticket1 = Ticket.create!(
-      title:         'com test 1',
-      group:         Group.lookup(name: 'Users'),
-      customer_id:   2,
-      state:         Ticket::State.lookup(name: 'new'),
-      priority:      Ticket::Priority.lookup(name: '2 normal'),
-      updated_by_id: 1,
-      created_by_id: 1,
-    )
-    assert(ticket1, 'ticket created')
-
-    article1 = Ticket::Article.create!(
-      ticket_id:     ticket1.id,
-      from:          'some_customer_com-1@example.com',
-      to:            'some_zammad_com-1@example.com',
-      subject:       'com test 1',
-      message_id:    'some@id_com_1',
-      body:          'some message 123',
-      internal:      false,
-      sender:        Ticket::Article::Sender.find_by(name: 'Customer'),
-      type:          Ticket::Article::Type.find_by(name: 'email'),
-      updated_by_id: 1,
-      created_by_id: 1,
-    )
-
-    Observer::Transaction.commit
-    Scheduler.worker(true)
-
-    ticket1.reload
-    assert_equal('new', ticket1.state.name)
-
-    ticket1.with_lock do
-      ticket1.update!(state_id: Ticket::State.find_by(name: 'closed').id)
-
-      article2 = Ticket::Article.create!(
-        ticket_id:     ticket1.id,
-        from:          'some_zammad_com-1@example.com',
-        to:            'some_customer_com-1@example.com',
-        subject:       'com test 1',
-        message_id:    'some@id_com_2',
-        body:          'some message 123',
-        internal:      false,
-        sender:        Ticket::Article::Sender.find_by(name: 'Agent'),
-        type:          Ticket::Article::Type.find_by(name: 'email'),
-        updated_by_id: 1,
-        created_by_id: 1,
-      )
-    end
-
-    Observer::Transaction.commit
-    Scheduler.worker(true)
-
-    ticket1.reload
-    assert_equal('closed', ticket1.state.name)
-
-  end
-
-end