1 /* 2 * Copyright (C) 2014 The Dagger Authors. 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package dagger.internal; 18 19 import static com.google.common.truth.Truth.assertThat; 20 21 import java.util.concurrent.atomic.AtomicInteger; 22 import javax.inject.Provider; 23 import org.junit.Test; 24 import org.junit.runner.RunWith; 25 import org.junit.runners.JUnit4; 26 27 /** 28 * Tests {@link SingleCheck}. 29 */ 30 @RunWith(JUnit4.class) 31 public class SingleCheckTest { 32 @Test(expected = NullPointerException.class) create_nullPointerException()33 public void create_nullPointerException() { 34 SingleCheck.provider(null); 35 } 36 37 @Test get()38 public void get() { 39 AtomicInteger integer = new AtomicInteger(); 40 Provider<Integer> provider = SingleCheck.provider(integer::getAndIncrement); 41 assertThat(provider.get()).isEqualTo(0); 42 assertThat(provider.get()).isEqualTo(0); 43 assertThat(provider.get()).isEqualTo(0); 44 } 45 } 46