question: public void testComputeZNaN ( ) { Geometry linearGeom = read ( "LINESTRING (0 0, 10 10 10)" ) ; LengthIndexedLine indexedLine = new LengthIndexedLine ( linearGeom ) ; double projIndex = indexedLine . project ( new Coordinate ( 5 , 5 ) ) ; Coordinate projPt = indexedLine . extractPoint ( projIndex ) ; assertTrue ( Double . isNaN ( projPt . z ) ) ; }
target:  Tests that if the input does not have Z ordinates, neither does the output.