![]() ![]() The library must be included via a tag in your html and is not available to be installed as a dependency via npm or yarn. window.Spreedlyīefore we start looking through, examining, and debugging code from this endeavor, let's take a moment to talk about how the Spreedly JavaScript library works at a high level. With all of my initial assumptions proven wrong, it was time to dive into what exactly was occurring when Spreedly initialized the managed input fields. Was there a bug in Cypress that was causing this defect? This also seemed slightly improbable. ![]() Was it possible that the JavaScript library provided by Spreedly was doing something weird based on the fact that it was running within Cypress' iframe? This seemed unlikely, especially since we had our iframe loading and working within Storybook, which like Cypress, rendered our application and components in its own iframe. There were simply no environment-specific configurations or variables that would cause deviations in behavior for this part of our application. I dove into various parts of our codebase looking for these sorts of culprits only to come up empty handed. Surely, though, this would be a simple fix and probably revolved around something like environment variables or environment-specific configurations. To make matters worse, the error event handler that was built into the Spreedly library wasn't logging any useful information. However, when loading and running our application in its normal context in the browser, everything worked fine and we could not reproduce the bug outside of Cypress despite our best efforts. The gist of this bug was that the Spreedly-managed credit card number and CVV input fields were failing to render and display in Cypress and as a consequence, were causing cascading failures in our tests. Little did I know of the journey I would go on when taking on bug ticket #5629. This is where we first encountered the bug. When Cypress Test Runner executes our tests, it loads our application into its own iframe and context. Now that's a lot of iframes, but you may be asking yourself "Can we go deeper?" The answer is a resounding yes! We also introduce yet another iframe during our end-to-end testing with Cypress. Spreedly injects a parent iframe within our own form's iframe, which then subsequently renders two children iframes for each of the Spreedly-managed fields. To make this easier to conceptualize, let's examine what this form might actually look like and where boundaries of the various iframes are. We were providing our own iframe to clients which then, in turn, had multiple Spreedly iframes embedded within that. Now, you may have already noticed, but we were working in an iframe inception. In addition, the library initializes and embeds two Spreedly-managed input fields, one for the user's credit card number and the other for the CVV, in a series of iframes. As part of Spreedly's offering, a JavaScript library is available that provides functionality to tokenize and store payment methods such as bank accounts and credit cards. As part of our efforts to create a secure experience for our users, we were using a third-party payment processor/gateway service called Spreedly. I was working on a client project where we were building a payment/checkout form to be embedded across a suite of UI applications as an iframe. ![]() I'm hoping that you may find some value or learn something new in this recount of the steps I took, tools I used, and misdirections I encountered in my clash with this bug. It took all of the debugging techniques I have learned as a developer (and then some!) to solve and fix it. Recently, I found myself tackling one of the most difficult, bewildering, and intricate bugs that I have ever faced thus far in my career. Being able to effectively discover, track down, and resolve bugs is one of the most important skills in our toolboxes. ![]() This can lead to degraded user experiences, application downtime, and potentially a loss of revenue for our businesses. Despite our best intentions, careful code craftsmanship, and thorough testing, these software defects will still discreetly and insidiously make their way into our applications. As software engineers, a large portion of our time is spent researching, reproducing, and fixing bugs. ![]()
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