android/arch/persistence/room/integration/testapp/test/PojoWithRelationTest.java

/*
 * Copyright (C) 2017 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package android.arch.persistence.room.integration.testapp.test;

import static org.hamcrest.CoreMatchers.is;
import static org.hamcrest.CoreMatchers.notNullValue;
import static org.hamcrest.MatcherAssert.assertThat;

import android.arch.persistence.room.integration.testapp.vo.EmbeddedUserAndAllPets;
import android.arch.persistence.room.integration.testapp.vo.Pet;
import android.arch.persistence.room.integration.testapp.vo.Toy;
import android.arch.persistence.room.integration.testapp.vo.User;
import android.arch.persistence.room.integration.testapp.vo.UserAndAllPets;
import android.arch.persistence.room.integration.testapp.vo.UserIdAndPetNames;
import android.arch.persistence.room.integration.testapp.vo.UserWithPetsAndToys;
import android.support.test.filters.SmallTest;
import android.support.test.runner.AndroidJUnit4;

import org.junit.Test;
import org.junit.runner.RunWith;

import java.util.Arrays;
import java.util.Collections;
import java.util.List;

@RunWith(AndroidJUnit4.class)
@SmallTest
public class PojoWithRelationTest extends TestDatabaseTest {
    @Test
    public void fetchAll() {
        User[] users = TestUtil.createUsersArray(1, 2, 3);
        Pet[][] userPets = new Pet[3][];
        mUserDao.insertAll(users);
        for (User user : users) {
            Pet[] pets = TestUtil.createPetsForUser(user.getId(), user.getId() * 10,
                    user.getId() - 1);
            mPetDao.insertAll(pets);
            userPets[user.getId() - 1] = pets;
        }
        List<UserAndAllPets> usersAndPets = mUserPetDao.loadAllUsersWithTheirPets();
        assertThat(usersAndPets.size(), is(3));
        assertThat(usersAndPets.get(0).user, is(users[0]));
        assertThat(usersAndPets.get(0).pets, is(Collections.<Pet>emptyList()));

        assertThat(usersAndPets.get(1).user, is(users[1]));
        assertThat(usersAndPets.get(1).pets, is(Arrays.asList(userPets[1])));

        assertThat(usersAndPets.get(2).user, is(users[2]));
        assertThat(usersAndPets.get(2).pets, is(Arrays.asList(userPets[2])));
    }

    private void createData() {
        User[] users = TestUtil.createUsersArray(1, 2);
        mUserDao.insertAll(users);
        Pet user1_pet1 = TestUtil.createPet(1);
        user1_pet1.setUserId(1);
        user1_pet1.setName("pet1");
        mPetDao.insertOrReplace(user1_pet1);

        Pet user1_pet2 = TestUtil.createPet(2);
        user1_pet2.setUserId(1);
        user1_pet2.setName("pet2");
        mPetDao.insertOrReplace(user1_pet2);

        Pet user2_pet1 = TestUtil.createPet(3);
        user2_pet1.setUserId(2);
        user2_pet1.setName("pet3");
        mPetDao.insertOrReplace(user2_pet1);
    }

    @Test
    public void fetchWithNames() {
        createData();

        List<UserIdAndPetNames> usersAndPets = mUserPetDao.loadUserAndPetNames();
        assertThat(usersAndPets.size(), is(2));
        assertThat(usersAndPets.get(0).userId, is(1));
        assertThat(usersAndPets.get(1).userId, is(2));
        assertThat(usersAndPets.get(0).names, is(Arrays.asList("pet1", "pet2")));
        assertThat(usersAndPets.get(1).names, is(Collections.singletonList("pet3")));
    }

    @Test
    public void nested() {
        createData();
        Toy pet1_toy1 = new Toy();
        pet1_toy1.setName("toy1");
        pet1_toy1.setPetId(1);
        Toy pet1_toy2 = new Toy();
        pet1_toy2.setName("toy2");
        pet1_toy2.setPetId(1);
        mToyDao.insert(pet1_toy1, pet1_toy2);
        List<UserWithPetsAndToys> userWithPetsAndToys = mUserPetDao.loadUserWithPetsAndToys();
        assertThat(userWithPetsAndToys.size(), is(2));
        UserWithPetsAndToys first = userWithPetsAndToys.get(0);
        List<Toy> toys = first.pets.get(0).toys;
        assertThat(toys.get(0).getName(), is("toy1"));
        assertThat(toys.get(1).getName(), is("toy2"));
        assertThat(userWithPetsAndToys.get(1).pets.get(0).toys, is(Collections.<Toy>emptyList()));
    }

    @Test
    public void duplicateParentField() {
        User[] users = TestUtil.createUsersArray(1, 2);
        Pet[] pets_1 = TestUtil.createPetsForUser(1, 1, 2);
        Pet[] pets_2 = TestUtil.createPetsForUser(2, 10, 1);
        mUserDao.insertAll(users);
        mPetDao.insertAll(pets_1);
        mPetDao.insertAll(pets_2);
        List<UserAndAllPets> userAndAllPets = mUserPetDao.unionByItself();
        assertThat(userAndAllPets.size(), is(4));
        for (int i = 0; i < 4; i++) {
            assertThat("user at " + i, userAndAllPets.get(i).user, is(users[i % 2]));
        }
        assertThat(userAndAllPets.get(0).pets, is(Arrays.asList(pets_1)));
        assertThat(userAndAllPets.get(2).pets, is(Arrays.asList(pets_1)));

        assertThat(userAndAllPets.get(1).pets, is(Arrays.asList(pets_2)));
        assertThat(userAndAllPets.get(3).pets, is(Arrays.asList(pets_2)));
    }

    @Test
    public void embeddedRelation() {
        createData();
        EmbeddedUserAndAllPets relationContainer = mUserPetDao.loadUserAndPetsAsEmbedded(1);
        assertThat(relationContainer.getUserAndAllPets(), notNullValue());
        assertThat(relationContainer.getUserAndAllPets().user.getId(), is(1));
        assertThat(relationContainer.getUserAndAllPets().pets.size(), is(2));
    }
}