1 files changed, 19 insertions, 2 deletions
diff --git a/spec/lib/additional_email_headers_interceptor_spec.rb b/spec/lib/additional_email_headers_interceptor_spec.rb
index 580450eef1e..b5c1a360ba9 100644
--- a/spec/lib/additional_email_headers_interceptor_spec.rb
+++ b/spec/lib/additional_email_headers_interceptor_spec.rb
@@ -1,12 +1,29 @@
 require 'spec_helper'
 
 describe AdditionalEmailHeadersInterceptor do
-  it 'adds Auto-Submitted header' do
-    mail = ActionMailer::Base.mail(to: 'test@mail.com', from: 'info@mail.com', body: 'hello').deliver
+  let(:mail) do
+    ActionMailer::Base.mail(to: 'test@mail.com', from: 'info@mail.com', body: 'hello')
+  end
+
+  before do
+    mail.deliver_now
+  end
 
+  it 'adds Auto-Submitted header' do
     expect(mail.header['To'].value).to eq('test@mail.com')
     expect(mail.header['From'].value).to eq('info@mail.com')
     expect(mail.header['Auto-Submitted'].value).to eq('auto-generated')
     expect(mail.header['X-Auto-Response-Suppress'].value).to eq('All')
   end
+
+  context 'when the same mail object is sent twice' do
+    before do
+      mail.deliver_now
+    end
+
+    it 'does not add the Auto-Submitted header twice' do
+      expect(mail.header['Auto-Submitted'].value).to eq('auto-generated')
+      expect(mail.header['X-Auto-Response-Suppress'].value).to eq('All')
+    end
+  end
 end