The default langtools make test setting result in no output, or maybe just output for fail,error (not sure since not many tests fail).
I would expect the usual output as set by 'default',

runner starting test: tools/javac/generics/typevars/6486430/T6486430a.java
runner finished test: tools/javac/generics/typevars/6486430/T6486430a.java
Passed. Compilation failed as expected
runner starting test: tools/javac/generics/typevars/6569404/T6569404a.java
runner finished test: tools/javac/generics/typevars/6569404/T6569404a.java
Passed. Execution successful

Otherwise, not only does there appear to be no output, but output is inconsistent with other test roots.