test/jdk/java/util/Locale/UseOldISOCodesTest.java

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/*
 * @test
 * @bug 8295232 8353118
 * @summary Tests for the "java.locale.useOldISOCodes" system property
 * @library /test/lib
 * @run junit UseOldISOCodesTest
 */

import java.util.Locale;
import jdk.test.lib.process.ProcessTools;

import org.junit.jupiter.api.Test;

import static org.junit.jupiter.api.Assertions.assertEquals;

public class UseOldISOCodesTest {

    @Test
    public void testUseOldISOCodes() throws Exception {
        var oa = ProcessTools.executeTestJava("-Djava.locale.useOldISOCodes=true", "UseOldISOCodesTest$Runner")
                .outputTo(System.out)
                .errorTo(System.err);
        oa.shouldHaveExitValue(0);
        oa.stderrShouldMatch("WARNING: The use of the system property \"java.locale.useOldISOCodes\" is deprecated. It will be removed in a future release of the JDK.");
    }

    static class Runner {
        private static final String obsoleteCode = "iw";
        private static final String newCode = "he";

        public static void main(String[] args) {
            // Ensure java.locale.useOldISOCodes is only interpreted at runtime startup
            // Should have no effect
            System.setProperty("java.locale.useOldISOCodes", "false");
            Locale locale = Locale.of(newCode);
            assertEquals(obsoleteCode, locale.getLanguage(),
                    "newCode 'he' was not mapped to 'iw' with useOldISOCodes=true");
        }
    }
}