feat: implement login

spec/enterprise/controllers/omniauth_controller_spec.rb

@@ -36,8 +36,29 @@ RSpec.describe 'SAML Authentication API', type: :request do
 
         expect(response).to have_http_status(:ok)
         json_response = JSON.parse(response.body)
-        expect(json_response['message']).to eq('Login successful')
-        expect(json_response['user']['email']).to eq('john.doe@example.com')
+        expect(json_response['data']).to be_present
+        expect(json_response['data']['email']).to eq('john.doe@example.com')
+        expect(json_response['data']['id']).to eq(existing_user.id)
+      end
+
+      it 'creates authentication tokens for the user' do
+        expect do
+          post "/auth/saml/#{account.id}/callback",
+               env: { 'omniauth.auth' => auth_hash },
+               as: :json
+        end.to change { existing_user.reload.tokens.count }.by(1)
+      end
+
+      it 'updates user sign in tracking' do
+        existing_user
+
+        expect do
+          post "/auth/saml/#{account.id}/callback",
+               env: { 'omniauth.auth' => auth_hash },
+               as: :json
+        end.to change { existing_user.reload.sign_in_count }.by(1)
+
+        expect(existing_user.reload.current_sign_in_at).to be_present
       end
     end