> What should to go into src/test/super?
>

This can be used to super source classes for GWT compiler that you only use 
within GwtTestCase and not in your normal app code, e.g. some test library 
that only works with GWT if you super source some classes.

As a little extreme example you can take a look at GWT SDK itself which 
also uses test super sources. For example GWT SDK has a Java8Test class 
that should test the GWT compiler in terms of Java 8 language features like 
lambdas. But back in the day when this test had been created, GWT SDK was 
still compiled using Java 1.6. So adding a test with Java 8 language 
features would have failed to compile using javac. To solve this issue the 
whole test is just an empty placeholder and has been super sourced for GWT 
(and that super sourced class excluded from javac). That super sourced 
class has the actual tests.

The test visible to javac: 
https://github.com/gwtproject/gwt/blob/master/user*/test/*
com/google/gwt/dev/jjs/test/Java8Test.java

The super sourced test visible to GWT compiler and thus the real 
GwtTestCase that will be executed: 
https://github.com/gwtproject/gwt/blob/master/user*/test-super/*
com/google/gwt/dev/jjs/super/com/google/gwt/dev/jjs/test/Java8Test.java


-- J.

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