content: /**
   * 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.domain.executor.PostExecutionThread;
  import com.fernandocejas.android10.sample.domain.executor.ThreadExecutor;
  import io.reactivex.Observable;
  import io.reactivex.observers.DisposableObserver;
  import io.reactivex.schedulers.TestScheduler;
  import org.junit.Before;
  import org.junit.Rule;
  import org.junit.Test;
  import org.junit.rules.ExpectedException;
  import org.junit.runner.RunWith;
  import org.mockito.Mock;
  import org.mockito.runners.MockitoJUnitRunner;
  
  import static org.assertj.core.api.Assertions.assertThat;
  import static org.mockito.BDDMockito.given;
  
  @RunWith(MockitoJUnitRunner.class)
  public class UseCaseTest {
  
    private UseCaseTestClass useCase;
  
    private TestDisposableObserver<Object> testObserver;
  
    @Mock private ThreadExecutor mockThreadExecutor;
    @Mock private PostExecutionThread mockPostExecutionThread;
  
    @Rule public ExpectedException expectedException = ExpectedException.none();
  
    @Before
    public void setUp() {
      this.useCase = new UseCaseTestClass(mockThreadExecutor, mockPostExecutionThread);
      this.testObserver = new TestDisposableObserver<>();
      given(mockPostExecutionThread.getScheduler()).willReturn(new TestScheduler());
    }
  
    @Test
    public void testBuildUseCaseObservableReturnCorrectResult() {
      useCase.execute(testObserver, Params.EMPTY);
  
      assertThat(testObserver.valuesCount).isZero();
    }
  
    @Test
    public void testSubscriptionWhenExecutingUseCase() {
      useCase.execute(testObserver, Params.EMPTY);
      useCase.dispose();
  
      assertThat(testObserver.isDisposed()).isTrue();
    }
  
    @Test
    public void testShouldFailWhenExecuteWithNullObserver() {
      expectedException.expect(NullPointerException.class);
      useCase.execute(null, Params.EMPTY);
    }
  
    private static class UseCaseTestClass extends UseCase<Object, Params> {
  
      UseCaseTestClass(ThreadExecutor threadExecutor, PostExecutionThread postExecutionThread) {
        super(threadExecutor, postExecutionThread);
      }
  
      @Override Observable<Object> buildUseCaseObservable(Params params) {
        return Observable.empty();
      }
  
      @Override
      public void execute(DisposableObserver<Object> observer, Params params) {
        super.execute(observer, params);
      }
    }
  
    private static class TestDisposableObserver<T> extends DisposableObserver<T> {
      private int valuesCount = 0;
  
      @Override public void onNext(T value) {
        valuesCount++;
      }
  
      @Override public void onError(Throwable e) {
        // no-op by default.
      }
  
      @Override public void onComplete() {
        // no-op by default.
      }
    }
  
    private static class Params {
      private static Params EMPTY = new Params();
      private Params() {}
    }
  }
  