TestPolylineTo.java

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   this work for additional information regarding copyright ownership.
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package org.apache.poi.xdgf.usermodel.section.geometry;

import com.microsoft.schemas.office.visio.x2012.main.RowType;
import org.apache.poi.ooxml.POIXMLException;
import org.apache.poi.xdgf.usermodel.XDGFShape;
import org.junit.jupiter.api.Assertions;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.ValueSource;

import java.awt.geom.Path2D;
import java.util.HashMap;

public class TestPolylineTo {

    private static final double X0 = 0.0;
    private static final double Y0 = 0.0;
    private static final double X = 100.0;
    private static final double Y = 100.0;

    @ParameterizedTest
    @ValueSource(strings = {
            "POLYLINE(1, 1, 0.0, 50.0, 100.0, 50.0)",
            "POLYLINE(1, 0, 0.0,  0.5, 100.0,  0.5)",
            "POLYLINE(0, 1, 0.0, 50.0,   1.0, 50.0)",
            "POLYLINE(0, 0, 0.0,  0.5,   1.0,  0.5)"
    })
    public void shouldAddMultipleLinesToPath(String formula) {
        PolyLineTo polyLine = createPolyLine(formula);

        XDGFShape parent = GeometryTestUtils.mockShape(X - X0, Y - Y0);

        Path2D.Double actualPath = new Path2D.Double();
        actualPath.moveTo(X0, Y0);

        polyLine.addToPath(actualPath, parent);

        Path2D expectedPath = new Path2D.Double();
        expectedPath.moveTo(X0, Y0);
        expectedPath.lineTo(0.0, 50.0);
        expectedPath.lineTo(100.0, 50.0);
        expectedPath.lineTo(X, Y);

        GeometryTestUtils.assertPath(expectedPath, actualPath);
    }

    @Test
    public void shouldAddSingleLineToPath() {
        PolyLineTo polyLine = createPolyLine("POLYLINE(1, 1)");

        XDGFShape parent = GeometryTestUtils.mockShape(X - X0, Y - Y0);

        Path2D.Double actualPath = new Path2D.Double();
        actualPath.moveTo(X0, Y0);

        polyLine.addToPath(actualPath, parent);

        Path2D expectedPath = new Path2D.Double();
        expectedPath.moveTo(X0, Y0);
        expectedPath.lineTo(X, Y);

        GeometryTestUtils.assertPath(expectedPath, actualPath);
    }

    @ParameterizedTest
    @ValueSource(strings = {
            "1, 1)",                 // Does not start with POLYLINE(
            "POLYLINE(1, 1",         // Does not end with )
            "POLYLINE()",            // Empty arguments
            "POLYLINE(1)",           // Not enough arguments (less than two)
            "POLYLINE(1, 1, 100.0)", // Odd number of arguments
    })
    public void shouldThrowExceptionWhenPolyLineFormulaIsIncorrect(String formula) {
        PolyLineTo polyLine = createPolyLine(formula);

        Path2D.Double path = new Path2D.Double();
        Assertions.assertThrows(POIXMLException.class, () -> polyLine.addToPath(path, null));
    }

    private static PolyLineTo createPolyLine(String formula) {
        RowType row = GeometryTestUtils.createRow(
                0L,
                new HashMap<String, Object>() {{
                    put("X", X);
                    put("Y", Y);
                    put("A", formula);
                }}
        );
        return new PolyLineTo(row);
    }

}