TestMultiOperandNumericFunction.java

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   this work for additional information regarding copyright ownership.
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package org.apache.poi.ss.formula.functions;

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertTrue;

import org.apache.poi.ss.SpreadsheetVersion;
import org.apache.poi.ss.formula.eval.EvaluationException;
import org.apache.poi.ss.formula.eval.MissingArgEval;
import org.apache.poi.ss.formula.eval.NumberEval;
import org.apache.poi.ss.formula.eval.ValueEval;
import org.junit.jupiter.api.Test;

class TestMultiOperandNumericFunction {

    @Test
    void testSettings() {
        MultiOperandNumericFunction fun = new MultiOperandNumericFunction(true, true) {
            @Override
            protected double evaluate(double[] values) throws EvaluationException {
                return 0;
            }

        };
        assertEquals(SpreadsheetVersion.EXCEL2007.getMaxFunctionArgs(), fun.getMaxNumOperands());
    }

    @Test
    void missingArgEvalsAreCountedAsZeroIfPolicyIsCoerce() {
        MultiOperandNumericFunction instance = new Stub(true, true, MultiOperandNumericFunction.Policy.COERCE);
        ValueEval result = instance.evaluate(new ValueEval[]{MissingArgEval.instance}, 0, 0);
        assertTrue(result instanceof NumberEval);
        assertEquals(0.0, ((NumberEval)result).getNumberValue(), 0);
    }

    @Test
    void missingArgEvalsAreSkippedIfZeroIfPolicyIsSkipped() {
        MultiOperandNumericFunction instance = new Stub(true, true, MultiOperandNumericFunction.Policy.SKIP);
        ValueEval result = instance.evaluate(new ValueEval[]{new NumberEval(1), MissingArgEval.instance}, 0, 0);
        assertTrue(result instanceof NumberEval);
        assertEquals(1.0, ((NumberEval)result).getNumberValue(), 0);
    }

    private static class Stub extends MultiOperandNumericFunction {
        protected Stub(
                boolean isReferenceBoolCounted, boolean isBlankCounted, MultiOperandNumericFunction.Policy missingArgEvalPolicy) {
            super(isReferenceBoolCounted, isBlankCounted);
            setMissingArgPolicy(missingArgEvalPolicy);
        }

        @Override
        protected double evaluate(double[] values) throws EvaluationException {
            return values[0];
        }
    }
}