1. A method comprising: under control of one or more processors of a device specifically configured with executable instructions, sending, from an application executing on the device, a request for content, based at least in part on a uniform resource locator (URL); receiving, by the device, a test intermediary and a test user interface (UI) in response to the request for content; receiving, by the device, the content requested by the request for content, the content including executable code enabling the content to be interactive; rendering the test UI in a webview instance associated with the application; rendering, in the webview instance, the content requested by the request for content; receiving, by the test intermediary, at least one communication between the content and the application; providing, by the test intermediary, to the test UI, test information corresponding to the at least one communication; and displaying the test information in the test UI contemporaneously with the content.