Agree, actually designing & implementing good tests requires a lot of effort. It's rarely wasted effort but if you really need something out the door now it can distract from short term delivery.
e.g. I'm using a 3rd party transpiler / build tool, which I don't know all the details of, my test runner wouldn't do exactly the same transpliation of code this build tool, it took me about an hour to figure out where the build tool's config file was and how to get it working with the test runner.
Did I learn more about my tooling and code base? Yes. Was it useful? well maybe not as I might kill this project shortly anyway.
e.g. I'm using a 3rd party transpiler / build tool, which I don't know all the details of, my test runner wouldn't do exactly the same transpliation of code this build tool, it took me about an hour to figure out where the build tool's config file was and how to get it working with the test runner.
Did I learn more about my tooling and code base? Yes. Was it useful? well maybe not as I might kill this project shortly anyway.