Hello, I have a simple test class:
import org.apache.poi.ss.formula.WorkbookEvaluator;
import org.apache.poi.ss.formula.eval.NumberEval;
import org.apache.poi.ss.formula.eval.ValueEval;
import org.apache.poi.ss.formula.functions.Function;
import org.junit.Test;
public class FunctionRegistratorIT1 {
@Test
public void testRegisterFunction1() {
WorkbookEvaluator.registerFunction("TREND", new DummyExcelFunction());
}
@Test
public void testRegisterFunction2() {
WorkbookEvaluator.registerFunction("TREND", new DummyExcelFunction());
}
private class DummyExcelFunction implements Function {
@Override
public ValueEval evaluate(ValueEval[] args, int srcRowIndex, int
srcColumnIndex) {
return new NumberEval(0);
}
}
}
Oddly enough, the test being executed second fails with
'IllegalArgumentException: POI already implements TREND. You cannot POI's
implementations of Excel functions'. If I comment one of the tests out, the
other one passes. This behavior persists if the same function is registered in
different tests across a test suite.
I expected that every @Test is run in isolation, but it seems that
WorkbookEvaluator stores registered functions between invocations of different
tests within a suite.
Although it is possible that it is probably related to JUnit rather than POI,
perhaps someone here has already witnessed this behavior.
To sum up, the questions are:
* why does this happen?
* how can I have get several tests registering the same function names work?
Regards,
Vladislav
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