IntelliJ - Source Folder Defaulting
I frequently work in a test driven manner and as such I find that I’m often leaning on the IDE to generate classes for me from the expectations I have defined in my unit tests. It has always been slightly annoying for me that Eclipse defaults generated code to the same source folder from which it was generated. In the case of test driven development, this would be the test source folder. IntelliJ is aware of the distinction between source and test folders (or content roots in IntelliJ terms I believe) and suggests a source folder by default as the following images illustrate.

