TestUDFFinder.java

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   contributor license agreements.  See the NOTICE file distributed with
   this work for additional information regarding copyright ownership.
   The ASF licenses this file to You under the Apache License, Version 2.0
   (the "License"); you may not use this file except in compliance with
   the License.  You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

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   distributed under the License is distributed on an "AS IS" BASIS,
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package org.apache.poi.ss.formula.udf;

import static org.junit.jupiter.api.Assertions.assertNotNull;

import java.util.stream.Stream;

import org.apache.poi.ss.formula.OperationEvaluationContext;
import org.apache.poi.ss.formula.atp.AnalysisToolPak;
import org.apache.poi.ss.formula.eval.ValueEval;
import org.apache.poi.ss.formula.functions.FreeRefFunction;
import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.Arguments;
import org.junit.jupiter.params.provider.MethodSource;

public class TestUDFFinder {
    public static Stream<Arguments> instances() {
        UDFFinder notImplFinder = new DefaultUDFFinder(
            new String[] { "NotImplemented" },
            new FreeRefFunction[] { TestUDFFinder::notImplemented }
        );

        AggregatingUDFFinder aggUDF = new AggregatingUDFFinder(notImplFinder);
        aggUDF.add(AnalysisToolPak.instance);

        return Stream.of(
            Arguments.of("NotImplemented", notImplFinder),
            Arguments.of("BESSELJ", new AggregatingUDFFinder(AnalysisToolPak.instance)),
            Arguments.of("BESSELJ", aggUDF)
        );
    }

    @ParameterizedTest(name = "{0}")
    @MethodSource("instances")
    void confirmFindFunction(String functionName, UDFFinder instance) {
        FreeRefFunction func = instance.findFunction(functionName);
        assertNotNull(func);
    }

    private static ValueEval notImplemented(ValueEval[] args, OperationEvaluationContext ec) {
        throw new RuntimeException("not implemented");
    }
}