test/jdk/java/lang/String/RegionMatches.java

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/**
 * @test
 * @bug 4016509 8316879
 * @summary test regionMatches corner cases
 * @run junit RegionMatches
 */

import java.io.UnsupportedEncodingException;
import org.junit.jupiter.api.Test;
import static org.junit.jupiter.api.Assertions.assertTrue;

public class RegionMatches {

  private final String s1_LATIN1 = "abc";
  private final String s2_LATIN1 = "def";

  private final String s1_UTF16 = "\u041e\u0434\u043d\u0430\u0436\u0434\u044b";
  private final String s2_UTF16 = "\u0432\u0441\u0442\u0443\u0434\u0435\u043d";

  @Test
  public void TestLATIN1() {
      // Test for 4016509
      boolean result = s1_LATIN1.regionMatches(0, s2_LATIN1, 0, Integer.MIN_VALUE);
      assertTrue(result, "Integer overflow in RegionMatches when comparing LATIN1 strings");
  }

  @Test
  public void TestUTF16() throws UnsupportedEncodingException{
      // Test for 8316879
      boolean result = s1_UTF16.regionMatches(0, s2_UTF16, 0, Integer.MIN_VALUE + 1);
      assertTrue(result, "Integer overflow in RegionMatches when comparing UTF16 strings");
  }
}