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 * distributed with this work for additional information        *
 * regarding copyright ownership.  The ASF licenses this file   *
 * to you under the Apache License, Version 2.0 (the            *
 * "License"); you may not use this file except in compliance   *
 * with the License.  You may obtain a copy of the License at   *
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 * software distributed under the License is distributed on an  *
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY       *
 * KIND, either express or implied.  See the License for the    *
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package org.apache.james.transport.mailets.redirect;

import static org.assertj.core.api.Assertions.assertThat;
import static org.mockito.Mockito.mock;

import org.apache.mailet.Mail;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.ExpectedException;

public class MessageAlteringUtilsTest {

    @Rule
    public ExpectedException expectedException = ExpectedException.none();

    @Test
    public void buildShouldThrowWhenMailetIsNull() {
        expectedException.expect(NullPointerException.class);
        expectedException.expectMessage("'mailet' is mandatory");
        MessageAlteringUtils.from(null).build();
    }

    @Test
    public void buildShouldThrowWhenOriginalMailIsNull() {
        expectedException.expect(NullPointerException.class);
        expectedException.expectMessage("'originalMail' is mandatory");
        MessageAlteringUtils.from(mock(RedirectNotify.class))
            .build();
    }

    @Test
    public void buildShouldWorkWhenEverythingProvided() {
        MessageAlteringUtils.from(mock(RedirectNotify.class))
            .originalMail(mock(Mail.class))
            .build();
    }

    @Test
    public void getFileNameShouldReturnNoSubjectWhenSubjectIsNull() {
        MessageAlteringUtils alteredMailUtils = MessageAlteringUtils.from(mock(RedirectNotify.class))
                .originalMail(mock(Mail.class))
                .build();

        String fileName = alteredMailUtils.getFileName(null);

        assertThat(fileName).isEqualTo("No Subject");
    }

    @Test
    public void getFileNameShouldReturnNoSubjectWhenSubjectContainsOnlySpaces() {
        MessageAlteringUtils alteredMailUtils = MessageAlteringUtils.from(mock(RedirectNotify.class))
                .originalMail(mock(Mail.class))
                .build();

        String fileName = alteredMailUtils.getFileName("    ");

        assertThat(fileName).isEqualTo("No Subject");
    }

    @Test
    public void getFileNameShouldReturnSubjectWhenSubjectIsGiven() {
        MessageAlteringUtils alteredMailUtils = MessageAlteringUtils.from(mock(RedirectNotify.class))
                .originalMail(mock(Mail.class))
                .build();

        String fileName = alteredMailUtils.getFileName("my Subject");

        assertThat(fileName).isEqualTo("my Subject");
    }

    @Test
    public void getFileNameShouldReturnTrimmedSubjectWhenSubjectStartsWithSpaces() {
        MessageAlteringUtils alteredMailUtils = MessageAlteringUtils.from(mock(RedirectNotify.class))
                .originalMail(mock(Mail.class))
                .build();

        String fileName = alteredMailUtils.getFileName("    my Subject");

        assertThat(fileName).isEqualTo("my Subject");
    }
}
