public ValueEval getRelativeValue(int sheetIndex, int relativeRowIndex, int relativeColumnIndex) {
throw new RuntimeException("not expected to be called during this test");
}
public AreaEval offset(int relFirstRowIx, int relLastRowIx, int relFirstColIx,
int relLastColIx) {
AreaI area = new OffsetArea(getFirstRow(), getFirstColumn(),
relFirstRowIx, relLastRowIx, relFirstColIx, relLastColIx);
return new MockAreaEval(area);
}