TestWeekNumFunc.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 java.time.LocalDate;
import java.time.LocalDateTime;

import org.apache.poi.ss.formula.OperationEvaluationContext;
import org.apache.poi.ss.formula.eval.BlankEval;
import org.apache.poi.ss.formula.eval.ErrorEval;
import org.apache.poi.ss.formula.eval.NumberEval;
import org.apache.poi.ss.formula.eval.StringEval;
import org.apache.poi.ss.formula.eval.ValueEval;
import org.apache.poi.ss.usermodel.DateUtil;
import org.apache.poi.util.StringUtil;
import org.junit.jupiter.api.Test;

/**
 * Tests WEEKNUM(date[, return_type]) excel function
 * https://support.microsoft.com/en-us/office/weeknum-function-e5c43a03-b4ab-426c-b411-b18c13c75340
 */
class TestWeekNumFunc {
    private static final double TOLERANCE = 0.001;

    @Test
    void testEvaluate() {
        double date = DateUtil.getExcelDate(LocalDate.parse("2012-03-09"));
        assertEvaluateEquals(10.0, date);
        assertEvaluateEquals(10.0, date, 1);
        assertEvaluateEquals(11.0, date, 2);
        assertEvaluateEquals(11.0, date, 11);
        assertEvaluateEquals(11.0, date, 12);
        assertEvaluateEquals(11.0, date, 13);
        assertEvaluateEquals(11.0, date, 14);
        assertEvaluateEquals(11.0, date, 15);
        assertEvaluateEquals(10.0, date, 16);
        assertEvaluateEquals(10.0, date, 17);
        assertEvaluateEquals(10.0, date, 21);
    }

    @Test
    void testBug65606() {
        double date = DateUtil.getExcelDate(LocalDate.parse("2021-09-27"));
        assertEvaluateEquals(40.0, date);
        assertEvaluateEquals(39.0, date, 21);
    }

    @Test
    void testDateTime() {
        double date = DateUtil.getExcelDate(LocalDateTime.parse("2021-09-27T09:45:00"));
        assertEvaluateEquals(40.0, date);
    }

    @Test
    void testEvaluateInvalid() {
        assertEvaluateEquals("no args",       ErrorEval.VALUE_INVALID);
        assertEvaluateEquals("too many args", ErrorEval.VALUE_INVALID, new NumberEval(1.0), new NumberEval(1.0), new NumberEval(1.0));
        assertEvaluateEquals("negative date", ErrorEval.NUM_ERROR, new NumberEval(-1.0));
        assertEvaluateEquals("cannot coerce serial_number to number", ErrorEval.VALUE_INVALID, new StringEval(""));
        assertEvaluateEquals("cannot coerce return_type to number",   ErrorEval.NUM_ERROR, new NumberEval(1.0), new StringEval(""));
        assertEvaluateEquals("return_type is blank",   ErrorEval.NUM_ERROR, new StringEval("2"), BlankEval.instance);
        assertEvaluateEquals("invalid return_type",    ErrorEval.NUM_ERROR, new NumberEval(1.0), new NumberEval(18.0));
    }


    private static final OperationEvaluationContext DEFAULT_CONTEXT =
            new OperationEvaluationContext(null, null, 0, 1, 0, null);

    // for testing invalid invocations
    private void assertEvaluateEquals(String message, ErrorEval expected, ValueEval... args) {
        String formula = "WEEKNUM(" + StringUtil.join(args, ", ") + ")";
        ValueEval result = WeekNum.instance.evaluate(args, DEFAULT_CONTEXT);
        assertEquals(expected, result, formula + ": " + message);
    }

    private void assertEvaluateEquals(double expected, double dateValue) {
        String formula = "WEEKNUM(" + dateValue + ")";
        ValueEval[] args = new ValueEval[] { new NumberEval(dateValue) };
        ValueEval result = WeekNum.instance.evaluate(args, DEFAULT_CONTEXT);
        assertTrue(result instanceof NumberEval);
        assertEquals(expected, ((NumberEval)result).getNumberValue(), TOLERANCE, formula);
    }

    private void assertEvaluateEquals(double expected, double dateValue, double return_type) {
        String formula = "WEEKNUM(" + dateValue + ", " + return_type + ")";
        ValueEval[] args = new ValueEval[] { new NumberEval(dateValue), new NumberEval(return_type) };
        ValueEval result = WeekNum.instance.evaluate(args, DEFAULT_CONTEXT);
        assertTrue(result instanceof NumberEval);
        assertEquals(expected, ((NumberEval)result).getNumberValue(), TOLERANCE, formula);
    }
}