1 /*
2  * Copyright (C) 2018 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.functional;
18 
19 import dagger.Component;
20 import javax.inject.Inject;
21 import javax.inject.Provider;
22 import org.junit.Test;
23 import org.junit.runner.RunWith;
24 import org.junit.runners.JUnit4;
25 
26 /**
27  * This is a regression test that makes sure component method order does not affect initialization
28  * order.
29  */
30 @RunWith(JUnit4.class)
31 public final class ComponentMethodTest {
32 
33   static final class Dep1 {
34 
35     @Inject
Dep1(Dep2 dep2)36     Dep1(Dep2 dep2) {}
37   }
38 
39   static final class Dep2 {
40 
41     @Inject
Dep2(Dep3 dep3)42     Dep2(Dep3 dep3) {}
43   }
44 
45   static final class Dep3 {
46 
47     @Inject
Dep3()48     Dep3() {}
49   }
50 
51   @Component
52   interface NonTopologicalOrderComponent {
53 
dep1Provider()54     Provider<Dep1> dep1Provider();
55 
dep2Provider()56     Provider<Dep2> dep2Provider();
57   }
58 
59   @Component
60   interface TopologicalOrderComponent {
61 
dep2Provider()62     Provider<Dep2> dep2Provider();
63 
dep1Provider()64     Provider<Dep1> dep1Provider();
65   }
66 
67   @Test
testNonTopologicalOrderComponent()68   public void testNonTopologicalOrderComponent() throws Exception {
69     NonTopologicalOrderComponent component =
70         DaggerComponentMethodTest_NonTopologicalOrderComponent.create();
71     component.dep1Provider().get();
72     component.dep2Provider().get();
73   }
74 
75   @Test
testTopologicalOrderComponent()76   public void testTopologicalOrderComponent() throws Exception {
77     TopologicalOrderComponent component =
78         DaggerComponentMethodTest_TopologicalOrderComponent.create();
79     component.dep1Provider().get();
80     component.dep2Provider().get();
81   }
82 }
83