AutoMatterTypeAdapterFactoryTest.java

package io.norberg.automatter.gson;

import com.google.gson.FieldNamingPolicy;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;

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

import java.io.IOException;

import static org.hamcrest.core.Is.is;
import static org.junit.Assert.assertThat;

public class AutoMatterTypeAdapterFactoryTest {

  static final Foo FOO = new FooBuilder()
      .a(17)
      .b("foobar")
      .build();


  static final Bar BAR = new BarBuilder()
      .a(17)
      .b("foobar")
      .isPrivate(true)
      .build();

  private NestedGson nestedGson;

  Gson gson;

  @Before
  public void setUp() {
    gson = new GsonBuilder()
        .registerTypeAdapterFactory(new AutoMatterTypeAdapterFactory())
        .create();
    nestedGson = new NestedGsonBuilder().cutee(new NesteeBuilder().floof("foobar").build()).build();
  }

  @Test
  public void testJson() throws IOException {
    final String json = gson.toJson(FOO);
    final Foo parsed = gson.fromJson(json, Foo.class);
    assertThat(parsed, is(FOO));
  }

  @Test
  public void testSerializedName() throws IOException {
    final String json = gson.toJson(BAR); // isPrivate -> private
    assertThat(json, is("{\"a\":17,\"b\":\"foobar\",\"private\":true}"));
  }

  @Test
  public void testSerializedNameWithUnderscorePolicy() throws IOException {
    gson = new GsonBuilder()
        .registerTypeAdapterFactory(new AutoMatterTypeAdapterFactory())
        .setFieldNamingPolicy(FieldNamingPolicy.LOWER_CASE_WITH_UNDERSCORES)
        .create();
    final String json = gson.toJson(BAR); //isPrivate -> private
    final Bar parsed = gson.fromJson(json, Bar.class); //private -> isPrivate
    assertThat(parsed, is(BAR));
    //Make sure that tranlation of under_scored fields still work.
    final String underscoredIsPrivate = "{\"a\":17,\"b\":\"foobar\",\"is_private\":true}";
    assertThat(gson.fromJson(underscoredIsPrivate, Bar.class), is(BAR)); //is_private -> isPrivate
  }

  @Test
  public void testNesting() throws IOException {
    final String json = gson.toJson(nestedGson);
    assertThat(gson.fromJson(json, NestedGson.class), is(nestedGson));
  }
}