mailbox/elasticsearch/src/test/java/org/apache/james/mailbox/elasticsearch/json/EMailersTest.java

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package org.apache.james.mailbox.elasticsearch.json;

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

import org.junit.Test;

import com.google.common.base.Joiner;
import com.google.common.collect.ImmutableSet;

public class EMailersTest {

    @Test
    public void fromShouldThrowWhenSetIsNull() {
        assertThatThrownBy(() -> EMailers.from(null))
            .isInstanceOf(NullPointerException.class)
            .hasMessage("'emailers' is mandatory");
    }

    @Test
    public void serializeShouldReturnEmptyWhenEmptySet() {
        EMailers eMailers = EMailers.from(ImmutableSet.of());

        assertThat(eMailers.serialize()).isEmpty();
    }

    @Test
    public void serializeShouldNotJoinWhenOneElement() {
        EMailer emailer = new EMailer("name", "address");
        EMailers eMailers = EMailers.from(ImmutableSet.of(emailer));

        assertThat(eMailers.serialize()).isEqualTo(emailer.serialize());
    }

    @Test
    public void serializeShouldJoinWhenMultipleElements() {
        EMailer emailer = new EMailer("name", "address");
        EMailer emailer2 = new EMailer("name2", "address2");
        EMailer emailer3 = new EMailer("name3", "address3");

        String expected = Joiner.on(" ").join(emailer.serialize(), emailer2.serialize(), emailer3.serialize());

        EMailers eMailers = EMailers.from(ImmutableSet.of(emailer, emailer2, emailer3));

        assertThat(eMailers.serialize()).isEqualTo(expected);
    }
}