TestFormatSpecifierBounds.java

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 * 2 along with this work; if not, write to the Free Software Foundation,
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/*
 * @test
 * @bug 8253459
 * @run testng TestFormatSpecifierBounds
 */

import java.util.*;
import org.testng.annotations.Test;
import static org.testng.Assert.*;

@Test
public class TestFormatSpecifierBounds {

    public void testZeroIndex() {
        IllegalFormatException e = expectThrows(IllegalFormatException.class, () -> {
            String r = String.format("%0$s", "A", "B");
        });
        assertEquals(e.getMessage(), "Illegal format argument index = 0");
    }

    public void testNonRepresentableIntIndex() {
        IllegalFormatException e = expectThrows(IllegalFormatException.class, () -> {
            String r = String.format("%2147483648$s", "A", "B");
        });
        assertEquals(e.getMessage(), "Format argument index: (not representable as int)");
    }

    public void testZeroWidth() {
        assertThrows(IllegalFormatException.class, () -> {
            String r = String.format("%0s", "A", "B");
        });
    }

    public void testNonRepresentableWidth() {
        IllegalFormatException e = expectThrows(IllegalFormatException.class, () -> {
            String r = String.format("%2147483648s", "A", "B");
        });
        assertEquals(e.getMessage(), Integer.toString(Integer.MIN_VALUE));
    }

    public void testNonRepresentablePrecision() {
        IllegalFormatException e = expectThrows(IllegalFormatException.class, () -> {
            String r = String.format("%.2147483648s", "A", "B");
        });
        assertEquals(e.getMessage(), Integer.toString(Integer.MIN_VALUE));
    }
}