Before we dive into the world of testing Cron jobs, let’s first know what they are. In the computer’s world, a Cron job is a time-based job scheduler that automates the execution of tasks at predetermined intervals on Unix-like operating systems. These tasks can range from routine maintenance scripts to fetching data from APIs or performing backups.

The operating system is like the boss of your computer, handling security, networking, and keeping an eye on what’s happening. But tweaking or improving the core part of the operating system, called the kernel, is a bit tricky because it’s mainly focused on keeping things stable and secure. Most cool new stuff usually happens outside the core system, in what we call the user space. That’s where people add extra features or functions.

In the contemporary software development landscape, unit tests have become paramount for ensuring software quality. A prevalent practice during these tests involves mocking outgoing calls to decouple the code under test from external dependencies. Imagine, for a moment, a scenario where instead of writing mocks with pre-defined behaviours, you duplicate the behaviour of a real-world server.

How does gRPC work? A quick Google search would tell you that it uses HTTP/2.0 under the hood, but that’s about it. Most available guides talk about gRPC internals by assuming that you are already deeply familiar with HTTP/2.0, and the only proper documentation for HTTP/2 is the official RFC document, which doesn’t contain implementation details, and talks in abstract terms.

When it comes to testing software applications, various testing techniques can be employed. Three common testing methods are unit testing, integration testing and end-to-end testing. All these different kinds of testing overlap, so you just can’t implement one or two forms of testing and you will be good. Like if you are in the initial stage of development you can write a few unit tests which a developer can run once he makes changes to a function.