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/*
 * @test
 * @bug 8356152
 * @summary Check that huge concatenations throw OutOfMemoryError
 * @requires os.maxMemory > 8G
 * @run junit/othervm -Xmx8G -XX:+CompactStrings -Dcompact=true HugeConcatTest
 * @run junit/othervm -Xmx8G -XX:-CompactStrings -Dcompact=false HugeConcatTest
 */

import org.junit.jupiter.api.BeforeAll;
import org.junit.jupiter.api.Test;

import static org.junit.Assert.assertThrows;

public class HugeConcatTest {

    private static final int HUGE_LENGTH_UTF16 = Integer.MAX_VALUE / 2 - 2;

    private static String hugeLatin1;
    private static final String hugeUTF16 = "\u20AC".repeat(HUGE_LENGTH_UTF16);

    @BeforeAll
    public static void initHugeLatin1() {
        String compact = System.getProperty("compact", "true");
        int hugeLatin1Length = Boolean.parseBoolean(compact)
                ? Integer.MAX_VALUE - 2
                : HUGE_LENGTH_UTF16;
        hugeLatin1 = "a".repeat(hugeLatin1Length);
    }

    @Test
    public void testConcat_Latin1_Latin1() {
        assertThrows(OutOfMemoryError.class, () -> { var s = hugeLatin1 + hugeLatin1; });
        assertThrows(OutOfMemoryError.class, () -> hugeLatin1.concat(hugeLatin1));
    }

    @Test
    public void testConcat_Latin1_UTF16() {
        assertThrows(OutOfMemoryError.class, () -> { var s = hugeLatin1 + hugeUTF16; });
        assertThrows(OutOfMemoryError.class, () -> hugeLatin1.concat(hugeUTF16));
    }

    @Test
    public void testConcat_UTF16_Latin1() {
        assertThrows(OutOfMemoryError.class, () -> { var s = hugeUTF16 + hugeLatin1; });
        assertThrows(OutOfMemoryError.class, () -> hugeUTF16.concat(hugeLatin1));
    }

    @Test
    public void testConcat_UTF16_UTF16() {
        assertThrows(OutOfMemoryError.class, () -> { var s = hugeUTF16 + hugeUTF16; });
        assertThrows(OutOfMemoryError.class, () -> hugeUTF16.concat(hugeUTF16));
    }

}