1 files changed, 56 insertions, 0 deletions
diff --git a/spec/initializers/microsoft_graph_mailer_spec.rb b/spec/initializers/microsoft_graph_mailer_spec.rb
new file mode 100644
index 00000000000..fbe667e34fe
--- /dev/null
+++ b/spec/initializers/microsoft_graph_mailer_spec.rb
@@ -0,0 +1,56 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe 'microsoft_graph_mailer initializer for GitLab' do
+  let(:microsoft_graph_setting) do
+    {
+      user_id: SecureRandom.hex,
+      tenant: SecureRandom.hex,
+      client_id: SecureRandom.hex,
+      client_secret: SecureRandom.hex,
+      azure_ad_endpoint: 'https://test-azure_ad_endpoint',
+      graph_endpoint: 'https://test-graph_endpoint'
+    }
+  end
+
+  def load_microsoft_graph_mailer_initializer
+    load Rails.root.join('config/initializers/microsoft_graph_mailer.rb')
+  end
+
+  context 'when microsoft_graph_mailer is enabled' do
+    before do
+      stub_microsoft_graph_mailer_setting(microsoft_graph_setting.merge(enabled: true))
+    end
+
+    it 'configures ActionMailer' do
+      previous_delivery_method = ActionMailer::Base.delivery_method
+      previous_microsoft_graph_settings = ActionMailer::Base.microsoft_graph_settings
+
+      load_microsoft_graph_mailer_initializer
+
+      expect(ActionMailer::Base.delivery_method).to eq(:microsoft_graph)
+      expect(ActionMailer::Base.microsoft_graph_settings).to eq(microsoft_graph_setting)
+    ensure
+      ActionMailer::Base.delivery_method = previous_delivery_method
+      ActionMailer::Base.microsoft_graph_settings = previous_microsoft_graph_settings
+    end
+  end
+
+  context 'when microsoft_graph_mailer is disabled' do
+    before do
+      stub_microsoft_graph_mailer_setting(microsoft_graph_setting.merge(enabled: false))
+    end
+
+    it 'does not configure ActionMailer' do
+      previous_delivery_method = ActionMailer::Base.delivery_method
+      previous_microsoft_graph_settings = ActionMailer::Base.microsoft_graph_settings
+
+      load_microsoft_graph_mailer_initializer
+
+      expect(previous_microsoft_graph_settings).not_to eq(:microsoft_graph)
+      expect(ActionMailer::Base.delivery_method).to eq(previous_delivery_method)
+      expect(ActionMailer::Base.microsoft_graph_settings).to eq(previous_microsoft_graph_settings)
+    end
+  end
+end