Test updating account settings

test/controllers/accounts/settings_controller_test.rb

@@ -9,4 +9,10 @@ class Account::SettingsControllerTest < ActionDispatch::IntegrationTest
     get account_settings_path
     assert_response :success
   end
+
+  test "update" do
+    put account_settings_path, params: { account: { name: "New Account Name" }}
+    assert_equal "New Account Name", Account.sole.name
+    assert_redirected_to account_settings_path
+  end
 end