Testing (and craft) FTW!
I feel this so much from Ned Batchelder's post Testing is better than DSA:
In a job search, testing experience will stand out more than DSA depth. It shows you’ve thought about what it takes to write high-quality software instead of just academic exercises.
I frequently ask questions about testing when I do interviews for this very reason. It tells me a lot about how a candidate thinks about code. I find there's also a high corollary between test and craft. Put another way, people who care about testing often care about the craft of coding.
We need more of both in today's professional software engineers.