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 com.google.common.collect.ImmutableSet;
22 import java.util.Arrays;
23 import java.util.LinkedHashSet;
24 import java.util.Set;
25 import java.util.concurrent.atomic.AtomicInteger;
26 import javax.inject.Provider;
27 import org.junit.Rule;
28 import org.junit.Test;
29 import org.junit.rules.ExpectedException;
30 import org.junit.runner.RunWith;
31 import org.junit.runners.JUnit4;
32 
33 @RunWith(JUnit4.class)
34 @SuppressWarnings("unchecked")
35 public class SetFactoryTest {
36   @Rule public ExpectedException thrown = ExpectedException.none();
37 
38   @Test
providerReturnsNull()39   public void providerReturnsNull() {
40     Factory<Set<Integer>> factory =
41         SetFactory.<Integer>builder(0, 1).addCollectionProvider(() -> null).build();
42     thrown.expect(NullPointerException.class);
43     factory.get();
44   }
45 
46   @Test
providerReturnsNullSet()47   public void providerReturnsNullSet() {
48     Factory<Set<Integer>> factory =
49         SetFactory.<Integer>builder(1, 0).addProvider(() -> null).build();
50     thrown.expect(NullPointerException.class);
51     factory.get();
52   }
53 
54   @Test
providerReturnsSetWithNullElement()55   public void providerReturnsSetWithNullElement() {
56     Set<Integer> set = new LinkedHashSet<>(Arrays.asList(1, null, 3));
57     Factory<Set<Integer>> factory =
58         SetFactory.<Integer>builder(0, 1).addCollectionProvider(() -> set).build();
59     thrown.expect(NullPointerException.class);
60     factory.get();
61   }
62 
63   @Test
invokesProvidersEveryTime()64   public void invokesProvidersEveryTime() {
65     Factory<Set<Integer>> factory =
66         SetFactory.<Integer>builder(2, 2)
67             .addProvider(incrementingIntegerProvider(0))
68             .addProvider(incrementingIntegerProvider(10))
69             .addCollectionProvider(incrementingIntegerSetProvider(20))
70             .addCollectionProvider(incrementingIntegerSetProvider(30))
71             .build();
72     assertThat(factory.get()).containsExactly(0, 10, 20, 21, 30, 31);
73     assertThat(factory.get()).containsExactly(1, 11, 22, 23, 32, 33);
74     assertThat(factory.get()).containsExactly(2, 12, 24, 25, 34, 35);
75   }
76 
incrementingIntegerProvider(int seed)77   private static Provider<Integer> incrementingIntegerProvider(int seed) {
78     final AtomicInteger value = new AtomicInteger(seed);
79     return value::getAndIncrement;
80   }
81 
incrementingIntegerSetProvider(int seed)82   private static Provider<Set<Integer>> incrementingIntegerSetProvider(int seed) {
83     final AtomicInteger value = new AtomicInteger(seed);
84     return () -> ImmutableSet.of(value.getAndIncrement(), value.getAndIncrement());
85   }
86 }
87