While testing DFDL-313 I created a test to make sure newlines within expressions were preserved. I tried to set up my infoset but I had the spacing wrong. The test still passed. I created a few more tests with varying whitespace in the infoset and they all pass.

See the following tests:
test_internal_space_preserved2
test_internal_space_preserved3a
test_internal_space_preserved3b

In these files:
daffodil-test/src/test/scala-debug/edu/illinois/ncsa/daffodil/section23/dfdl_expressions/TestDFDLExpressionsDebug.scala
daffodil-test/src/test/resources/edu/illinois/ncsa/daffodil/section23/dfdl_expressions/expressions.tdml