On the other hand, I see a lot of Java code where the unit tests are woefully inadequate but the fact that Eclipse/IntelliJ/Whatever had no warnings and javac l

On the other hand, I see a lot of Java code where the unit tests are woefully inadequate but the fact that Eclipse/IntelliJ/Whatever had no warnings and javac liked the code meant the programmer thought he'd done a good job. Hell, most of the world's C code was written basically that way. Often with a lot less testing and most of the testing that was actually done included no edge cases.