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import java.util.Base64;
import static org.hamcrest.CoreMatchers.is;
import static org.hamcrest.MatcherAssert.assertThat;
import org.junit.Test;

public class Base64Test {

    @Test
    public void encodeAndDecode() {
        final String rawString = "duke";
        Base64.Encoder encoder = Base64.getEncoder();
        byte[] encodedContent = encoder.encode(rawString.getBytes());

        Base64.Decoder decoder = Base64.getDecoder();
        byte[] decodedContent = decoder.decode(encodedContent);

        String decodedString = new String(decodedContent);
        assertThat(decodedString, is(rawString));
    }
}