### Question:
ProgressEvent extends GwtEvent<Handler> { public boolean isLengthComputable() { return 0 != _total; } ProgressEvent( final int loaded, final int total ); static GwtEvent.Type<Handler> getType(); boolean isLengthComputable(); int getLoaded(); int getTotal(); @Override GwtEvent.Type<Handler> getAssociatedType();  }### Answer:
@Test public void isLengthComputable() { assertFalse( new ProgressEvent( 0, 0 ).isLengthComputable() ); assertTrue( new ProgressEvent( 1, 2 ).isLengthComputable() ); }