According to the spec,
dfdl:hexBinary(-2084) is the hexBinary value "F7FF"

test hexBinary_unparse_17 sets up this example, but the actual output is 'f7dc' instead of 'f7ff'

Using a signed integer to hex conversion tool online, it looks like f7dc is the correct value.

Test is located in the following files:
daffodil-test/src/test/resources/edu/illinois/ncsa/daffodil/section05/simple_types/SimpleTypesUnparse.tdml
daffodil-test/src/test/scala-debug/edu/illinois/ncsa/daffodil/section05/simple_types/TestSimpleTypesDebug.scala
daffodil-test/src/test/scala/edu/illinois/ncsa/daffodil/section05/simple_types/TestSimpleTypesUnparse.scala