server/protocols/jmap-draft/src/test/java/org/apache/james/jmap/draft/json/MultipleObjectMapperTest.java

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

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

import org.junit.Before;
import org.junit.Test;

import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;

public class MultipleObjectMapperTest {

    private ObjectMapper mapper;

    @SuppressWarnings("unused")
    private static class First {
        public String first;
        public String other;
    }

    @SuppressWarnings("unused")
    private static class Second {
        public String second;
        public String other;
    }

    @Before
    public void setup() {
        mapper = new MultipleObjectMapperBuilder()
                    .registerClass("/first", First.class)
                    .registerClass("/second", Second.class)
                    .build();
    }

    @Test(expected = IllegalArgumentException.class)
    public void registeringSameUniquePathShouldThrowAnException() throws Exception {
        new MultipleObjectMapperBuilder()
            .registerClass("/other", First.class)
            .registerClass("/other", Second.class);
    }

    @Test
    public void registeringSameClassTwoTimesIsOK() throws Exception {
        ObjectMapper uselessMapper = new MultipleObjectMapperBuilder()
                .registerClass("/first", First.class)
                .registerClass("/other", First.class)
                .build();
        String json = "{\"first\": \"value\", \"other\": \"other\"}";
        Object o = uselessMapper.readValue(json, Object.class);
        assertThat(o).isInstanceOf(First.class);
    }

    @Test(expected = JsonMappingException.class)
    public void badJsonShouldThrowException() throws Exception {
        String json = "{\"bad\": \"value\"}";
        mapper.readValue(json, Object.class);
    }

    @Test
    public void firstJsonShouldReturnFirstClass() throws Exception {
        String json = "{\"first\": \"value\", \"other\": \"other\"}";
        Object o = mapper.readValue(json, Object.class);
        assertThat(o).isInstanceOf(First.class);
    }

    @Test
    public void secondJsonShouldReturnSecondClass() throws Exception {
        String json = "{\"second\": \"value\", \"other\": \"other\"}";
        Object o = mapper.readValue(json, Object.class);
        assertThat(o).isInstanceOf(Second.class);
    }
}