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MainActivityTest.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 paging.android.example.com.pagingsample; import android.app.Activity; import android.arch.core.executor.testing.CountingTaskExecutorRule; import android.content.Intent; import android.support.test.InstrumentationRegistry; import android.support.test.runner.AndroidJUnit4; import android.support.v7.widget.RecyclerView; import org.hamcrest.CoreMatchers; import org.hamcrest.MatcherAssert; import org.junit.Rule; import org.junit.Test; import org.junit.runner.RunWith; import java.util.concurrent.TimeUnit; import java.util.concurrent.TimeoutException; /** * Simply sanity test to ensure that activity launches without any issues and shows some data. */ @RunWith(AndroidJUnit4.class) public class MainActivityTest { @Rule public CountingTaskExecutorRule testRule = new CountingTaskExecutorRule(); @Test public void showSomeResults() throws InterruptedException, TimeoutException { Intent intent = new Intent(InstrumentationRegistry.getTargetContext(), MainActivity.class); intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); Activity activity = InstrumentationRegistry.getInstrumentation().startActivitySync(intent); testRule.drainTasks(10, TimeUnit.SECONDS); RecyclerView recyclerView = activity.findViewById(R.id.cheeseList); MatcherAssert.assertThat(recyclerView.getAdapter(), CoreMatchers.notNullValue()); MatcherAssert.assertThat(recyclerView.getAdapter().getItemCount() > 0, CoreMatchers.is(true)); } }