server/protocols/jmap-draft/src/test/java/org/apache/james/jmap/draft/model/HeaderTest.java

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package org.apache.james.jmap.draft.model;

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

import java.util.Optional;

import org.junit.Test;

import com.google.common.collect.ImmutableList;

public class HeaderTest {

    @Test
    public void builderShouldThrowWhenHeaderIsNull() {
        assertThatThrownBy(() -> Header.builder().header(null)).isInstanceOf(NullPointerException.class);
    }

    @Test
    public void builderShouldThrowWhenHeaderIsEmpty() {
        assertThatThrownBy(() -> Header.builder().header(ImmutableList.of())).isInstanceOf(IllegalArgumentException.class);
    }

    @Test
    public void builderShouldThrowWhenHeaderHasMoreThanTwoElements() {
        assertThatThrownBy(() -> Header.builder().header(ImmutableList.of("1", "2", "3"))).isInstanceOf(IllegalArgumentException.class);
    }

    @Test
    public void buildShouldThrowWhenNameIsNotGiven() {
        assertThatThrownBy(() -> Header.builder().build()).isInstanceOf(IllegalStateException.class);
    }

    @Test
    public void buildShouldSetNameWhenGiven() {
        String expectedName = "name";
        Header header = Header.builder().header(ImmutableList.of(expectedName)).build();

        assertThat(header.getName()).isEqualTo(expectedName);
        assertThat(header.getValue()).isEmpty();
    }

    @Test
    public void buildShouldSetValueWhenGiven() {
        String expectedName = "name";
        String expectedValue = "value";
        Header header = Header.builder().header(ImmutableList.of(expectedName, expectedValue)).build();

        assertThat(header.getName()).isEqualTo(expectedName);
        assertThat(header.getValue()).isEqualTo(Optional.of(expectedValue));
    }
}