import junit.framework.TestCase;
import java.io.ByteArrayOutputStream;
import java.io.PrintStream;
public class HelloWorldTest extends TestCase {
public void testHelloWorld() {
final var oldSystemOut = System.out;
final var outputStream = new ByteArrayOutputStream();
System.setOut(new PrintStream(outputStream));
try {
HelloWorld.main(null);
} finally {
System.setOut(oldSystemOut);
}
assertEquals("Hello world!" + System.lineSeparator(), outputStream.toString());
}
}
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