Chore: Increase test coverage for accounts controller (#475)

spec/controllers/api/v1/accounts_controller_spec.rb

@@ -9,10 +9,11 @@ RSpec.describe 'Accounts API', type: :request do
 
       before do
         allow(AccountBuilder).to receive(:new).and_return(account_builder)
-        allow(account_builder).to receive(:perform).and_return(user)
       end
 
       it 'calls account builder' do
+        allow(account_builder).to receive(:perform).and_return(user)
+
         params = { account_name: 'test', email: email }
 
         post api_v1_accounts_url,
@@ -23,6 +24,21 @@ RSpec.describe 'Accounts API', type: :request do
         expect(account_builder).to have_received(:perform)
         expect(response.headers.keys).to include('access-token', 'token-type', 'client', 'expiry', 'uid')
       end
+
+      it 'renders error response on invalid params' do
+        allow(account_builder).to receive(:perform).and_return(nil)
+
+        params = { account_name: nil, email: nil }
+
+        post api_v1_accounts_url,
+             params: params,
+             as: :json
+
+        expect(AccountBuilder).to have_received(:new).with(params)
+        expect(account_builder).to have_received(:perform)
+        expect(response).to have_http_status(:forbidden)
+        expect(response.body).to eq({ message: I18n.t('errors.signup.failed') }.to_json)
+      end
     end
   end
 end