diff --git a/spec/enterprise/controllers/enterprise/devise_overrides/omniauth_callbacks_controller_spec.rb b/spec/enterprise/controllers/enterprise/devise_overrides/omniauth_callbacks_controller_spec.rb
index af67e3009..45c08df2b 100644
--- a/spec/enterprise/controllers/enterprise/devise_overrides/omniauth_callbacks_controller_spec.rb
+++ b/spec/enterprise/controllers/enterprise/devise_overrides/omniauth_callbacks_controller_spec.rb
@@ -58,4 +58,68 @@ RSpec.describe 'Enterprise SAML OmniAuth Callbacks', type: :request do
       end
     end
   end
+
+  describe 'SAML SLO (Single Logout)' do
+    let(:saml_user) { create(:user, email: 'saml_user@example.com', provider: 'saml', account: account) }
+
+    before do
+      # Create some active sessions for the user
+      saml_user.tokens = {
+        'client1' => { 'token' => 'token1', 'expiry' => 1.hour.from_now.to_i },
+        'client2' => { 'token' => 'token2', 'expiry' => 2.hours.from_now.to_i }
+      }
+      saml_user.save!
+    end
+
+    describe 'SAML_SLO_SESSION_DESTROY_PROC' do
+      it 'destroys all user sessions when receiving IdP-initiated logout request' do
+        # Create a mock logout request with the user's email as name_id
+        logout_request = object_double(logout_request, name_id: saml_user.email)
+
+        # Create a mock OmniAuth strategy
+        strategy = object_double(strategy, response_object: logout_request)
+
+        # Create the environment hash that would be passed to the proc
+        env = { 'omniauth.strategy' => strategy }
+
+        # Execute the SLO session destroy proc
+        SAML_SLO_SESSION_DESTROY_PROC.call(env, {})
+
+        # Verify all sessions were destroyed
+        saml_user.reload
+        expect(saml_user.tokens).to eq({})
+      end
+
+      it 'only destroys sessions for SAML provider users' do
+        # Create a non-SAML user
+        email_user = create(:user, email: 'email_user@example.com', provider: 'email', account: account)
+        email_user.tokens = { 'client1' => { 'token' => 'token1', 'expiry' => 1.hour.from_now.to_i } }
+        email_user.save!
+
+        # Create another SAML user
+        saml_user2 = create(:user, email: 'another_saml@example.com', provider: 'saml', account: account)
+        saml_user2.tokens = { 'client2' => { 'token' => 'token2', 'expiry' => 1.hour.from_now.to_i } }
+        saml_user2.save!
+
+        # Create logout request for the second SAML user
+        logout_request = object_double(logout_request, name_id: 'another_saml@example.com')
+
+        strategy = object_double(strategy, response_object: logout_request)
+
+        env = { 'omniauth.strategy' => strategy }
+
+        # Execute the SLO session destroy proc
+        SAML_SLO_SESSION_DESTROY_PROC.call(env, {})
+
+        # Verify only the targeted SAML user sessions were destroyed
+        email_user.reload
+        saml_user.reload
+        saml_user2.reload
+
+        expect(email_user.tokens).not_to be_empty  # Non-SAML user unaffected
+        expect(saml_user.tokens).not_to be_empty   # Different SAML user unaffected
+        expect(saml_user2.tokens).to eq({})        # Target SAML user logged out
+      end
+    end
+  end
 end