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package org.apache.james.transport.mailets.utils;

import static org.assertj.core.api.Assertions.assertThat;

import java.util.Optional;

import javax.mail.internet.MimeMessage;

import org.apache.james.core.builder.MimeMessageBuilder;
import org.junit.jupiter.api.Test;

public class MimeMessageModifierTest {

    @Test
    public void replaceSubjectShouldReplaceTheSubjectWhenSubjectIsPresent() throws Exception {
        MimeMessage message = MimeMessageBuilder.mimeMessageBuilder()
            .setSubject("subject")
            .build();

        String expectedSubject = "new subject";
        new MimeMessageModifier(message).replaceSubject(Optional.of(expectedSubject));

        assertThat(message.getSubject()).isEqualTo(expectedSubject);
    }

    @Test
    public void replaceSubjectShouldNotAlterTheSubjectWhenSubjectIsAbsent() throws Exception {
        String expectedSubject = "subject";
        MimeMessage message = MimeMessageBuilder.mimeMessageBuilder()
                .setSubject(expectedSubject)
                .build();

        new MimeMessageModifier(message).replaceSubject(Optional.empty());

        assertThat(message.getSubject()).isEqualTo(expectedSubject);
    }
}
