UseCaseTest.java

/**
 * Copyright (C) 2015 Fernando Cejas 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 com.fernandocejas.android10.sample.domain.interactor;

import com.fernandocejas.android10.sample.data.executor.PostExecutionThread;
import com.fernandocejas.android10.sample.data.executor.ThreadExecutor;

import org.junit.Before;
import org.junit.Test;
import org.mockito.Mock;
import org.mockito.MockitoAnnotations;

import rx.Observable;
import rx.Subscriber;
import rx.observers.TestSubscriber;
import rx.schedulers.TestScheduler;

import static org.hamcrest.MatcherAssert.assertThat;
import static org.hamcrest.core.Is.is;
import static org.mockito.BDDMockito.given;

public class UseCaseTest {

  private UseCaseTestClass useCase;

  @Mock private ThreadExecutor mockThreadExecutor;
  @Mock private PostExecutionThread mockPostExecutionThread;

  @Before
  public void setUp() {
    MockitoAnnotations.initMocks(this);
    this.useCase = new UseCaseTestClass();
    this.useCase.setThreadExecutor(mockThreadExecutor);
    this.useCase.setPostExecutionThread(mockPostExecutionThread);
  }

  @Test
  @SuppressWarnings("unchecked")
  public void testBuildUseCaseObservableReturnCorrectResult() {
    TestSubscriber<Integer> testSubscriber = new TestSubscriber<>();
    TestScheduler testScheduler = new TestScheduler();
    given(mockPostExecutionThread.getScheduler()).willReturn(testScheduler);

    useCase.execute(testSubscriber);

    assertThat(testSubscriber.getOnNextEvents().size(), is(0));
  }

  @Test
  public void testSubscriptionWhenExecutingUseCase() {
    TestSubscriber<Integer> testSubscriber = new TestSubscriber<>();

    useCase.execute(testSubscriber);
    useCase.unsubscribe();

    assertThat(testSubscriber.isUnsubscribed(), is(true));
  }

  private static class UseCaseTestClass extends UseCase {

    @Override protected Observable buildUseCaseObservable() {
      return Observable.empty();
    }

    @Override public void execute(Subscriber UseCaseSubscriber) {
      super.execute(UseCaseSubscriber);
    }
  }
}