test/jdk/java/io/Console/DefaultCharsetTest.java

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import org.junit.jupiter.api.Test;
import static org.junit.jupiter.api.Assertions.*;

/**
 * @test
 * @bug 8341975 8351435
 * @summary Tests the default charset. It should honor `stdout.encoding`
 *          which should be the same as System.out.charset()
 * @modules jdk.internal.le
 * @run junit/othervm -Djdk.console=jdk.internal.le -Dstdout.encoding=UTF-8 DefaultCharsetTest
 * @run junit/othervm -Djdk.console=jdk.internal.le -Dstdout.encoding=ISO-8859-1 DefaultCharsetTest
 * @run junit/othervm -Djdk.console=jdk.internal.le -Dstdout.encoding=US-ASCII DefaultCharsetTest
 * @run junit/othervm -Djdk.console=jdk.internal.le -Dstdout.encoding=foo DefaultCharsetTest
 * @run junit/othervm -Djdk.console=jdk.internal.le DefaultCharsetTest
 */
public class DefaultCharsetTest {
    @Test
    public void testDefaultCharset() {
        var stdoutEncoding = System.getProperty("stdout.encoding");
        var sysoutCharset = System.out.charset();
        var consoleCharset = System.console().charset();
        System.out.println("""
                    stdout.encoding = %s
                    System.out.charset() = %s
                    System.console().charset() = %s
                """.formatted(stdoutEncoding, sysoutCharset.name(), consoleCharset.name()));
        assertEquals(consoleCharset, sysoutCharset,
            "Charsets for System.out and Console differ for stdout.encoding: %s".formatted(stdoutEncoding));
    }
}