3 files changed, 29 insertions, 0 deletions
diff --git a/vendor/gems/mail-smtp_pool/.gitlab-ci.yml b/vendor/gems/mail-smtp_pool/.gitlab-ci.yml
index 56eff5b30a7..4c9e62f7d11 100644
--- a/vendor/gems/mail-smtp_pool/.gitlab-ci.yml
+++ b/vendor/gems/mail-smtp_pool/.gitlab-ci.yml
@@ -12,6 +12,7 @@ workflow:
     - ruby -v                                   # Print out ruby version for debugging
     - gem install bundler --no-document         # Bundler is not installed with the image
     - bundle config set --local path 'vendor'   # Install dependencies into ./vendor/ruby
+    - bundle config set with 'development'
     - bundle install -j $(nproc)
   script:
     - bundle exec rspec
diff --git a/vendor/gems/mail-smtp_pool/lib/mail/smtp_pool.rb b/vendor/gems/mail-smtp_pool/lib/mail/smtp_pool.rb
index ab8a7652058..b0c82a3db71 100644
--- a/vendor/gems/mail-smtp_pool/lib/mail/smtp_pool.rb
+++ b/vendor/gems/mail-smtp_pool/lib/mail/smtp_pool.rb
@@ -30,5 +30,11 @@ module Mail
     def deliver!(mail)
       @pool.with { |conn| conn.deliver!(mail) }
     end
+
+    # This makes it compatible with Mail's `#deliver!` method
+    # https://github.com/mikel/mail/blob/22a7afc23f253319965bf9228a0a430eec94e06d/lib/mail/message.rb#L271
+    def settings
+      {}
+    end
   end
 end
diff --git a/vendor/gems/mail-smtp_pool/spec/lib/mail/smtp_pool_spec.rb b/vendor/gems/mail-smtp_pool/spec/lib/mail/smtp_pool_spec.rb
index aa2a0e19ac8..bbe5ef8b068 100644
--- a/vendor/gems/mail-smtp_pool/spec/lib/mail/smtp_pool_spec.rb
+++ b/vendor/gems/mail-smtp_pool/spec/lib/mail/smtp_pool_spec.rb
@@ -64,5 +64,27 @@ describe Mail::SMTPPool do
 
       expect(MockSMTP.deliveries.size).to eq(1)
     end
+
+    context 'when called from Mail:Message' do
+      before do
+        mail.delivery_method(described_class, { pool: described_class.create_pool })
+      end
+
+      describe '#deliver' do
+        it 'delivers mail' do
+          mail.deliver
+
+          expect(MockSMTP.deliveries.size).to eq(1)
+        end
+      end
+
+      describe '#deliver!' do
+        it 'delivers mail' do
+          mail.deliver!
+
+          expect(MockSMTP.deliveries.size).to eq(1)
+        end
+      end
+    end
   end
 end