GsonProviderTest.java

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package org.glassfish.jersey.gson.internal;

import org.junit.Test;

import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedHashMap;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.lang.annotation.Annotation;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;

/**
 * @author Martin Mares (martin.mares at oracle.com)
 */
public class GsonProviderTest {

    public static class A {
        private final String txt;
        private final int num;

        public A(String txt, int num) {
            this.txt = txt;
            this.num = num;
        }

        @Override
        public boolean equals(Object o) {
            if (this == o) return true;
            if (!(o instanceof A)) return false;

            A a = (A) o;

            if (num != a.num) return false;
            return !(txt != null ? !txt.equals(a.txt) : a.txt != null);

        }

        @Override
        public int hashCode() {
            int result = txt != null ? txt.hashCode() : 0;
            result = 31 * result + num;
            return result;
        }
    }

    @Test
    public void testIsReadable() throws Exception {
        GsonProvider provider = new GsonProvider();
        assertTrue(provider.isReadable(A.class, A.class, new Annotation[0], MediaType.APPLICATION_JSON_TYPE));
        assertTrue(provider.isReadable(A.class, A.class, new Annotation[0], new MediaType("application", "foo+json")));
        assertFalse(provider.isReadable(A.class, A.class, new Annotation[0], MediaType.TEXT_PLAIN_TYPE));
        assertFalse(provider.isReadable(FileInputStream.class,
                FileInputStream.class,
                new Annotation[0],
                MediaType.APPLICATION_JSON_TYPE));
    }

    @Test
    public void testIsWriteable() throws Exception {
        GsonProvider provider = new GsonProvider();
        assertTrue(provider.isWriteable(A.class, A.class, new Annotation[0], MediaType.APPLICATION_JSON_TYPE));
        assertTrue(provider.isWriteable(A.class, A.class, new Annotation[0], new MediaType("application", "foo+json")));
        assertFalse(provider.isWriteable(A.class, A.class, new Annotation[0], MediaType.TEXT_PLAIN_TYPE));
        assertFalse(provider.isWriteable(FileOutputStream.class,
                FileOutputStream.class,
                new Annotation[0],
                MediaType.APPLICATION_JSON_TYPE));
    }

    @Test
    public void testReadWrite() throws Exception {
        GsonProvider provider = new GsonProvider();
        A a = new A("foo", 100);
        ByteArrayOutputStream os = new ByteArrayOutputStream();
        provider.writeTo(a,
                a.getClass(),
                a.getClass(),
                new Annotation[0],
                MediaType.APPLICATION_JSON_TYPE,
                new MultivaluedHashMap<String, Object>(),
                os);
        ByteArrayInputStream is = new ByteArrayInputStream(os.toByteArray());
        Object o = provider.readFrom(A.class,
                        A.class,
                        new Annotation[0],
                        MediaType.APPLICATION_JSON_TYPE,
                        new MultivaluedHashMap<String, String>(),
                        is);
        assertTrue(o instanceof A);
        assertEquals(a, o);
    }
}