question: void assertNextTerms ( String expectedUnfolded , String expectedFolded , ASCIIFoldingFilter filter , CharTermAttribute termAtt ) throws Exception { assertTrue ( filter . incrementToken ( ) ) ; assertEquals ( expectedFolded , termAtt . toString ( ) ) ; if ( filter . isPreserveOriginal ( ) && ! expectedUnfolded . equals ( expectedFolded ) ) { assertTrue ( filter . incrementToken ( ) ) ; assertEquals ( expectedUnfolded , termAtt . toString ( ) ) ; } }
target:  Pop one input token's worth of tokens off the filter and verify that they are as expected.