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      1 /*
      2  * Copyright 2016-17, OpenCensus 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 io.opencensus.internal;
     18 
     19 import static com.google.common.truth.Truth.assertThat;
     20 
     21 import java.util.ServiceConfigurationError;
     22 import org.junit.Test;
     23 import org.junit.runner.RunWith;
     24 import org.junit.runners.JUnit4;
     25 
     26 /** Tests for {@link Provider}. */
     27 @RunWith(JUnit4.class)
     28 public class ProviderTest {
     29   static class GoodClass {
     30     public GoodClass() {}
     31   }
     32 
     33   static class PrivateConstructorClass {
     34     private PrivateConstructorClass() {}
     35   }
     36 
     37   static class NoDefaultConstructorClass {
     38     public NoDefaultConstructorClass(int arg) {}
     39   }
     40 
     41   private static class PrivateClass {}
     42 
     43   static interface MyInterface {}
     44 
     45   static class MyInterfaceImpl implements MyInterface {
     46     public MyInterfaceImpl() {}
     47   }
     48 
     49   @Test(expected = ServiceConfigurationError.class)
     50   public void createInstance_ThrowsErrorWhenClassIsPrivate() throws ClassNotFoundException {
     51     Provider.createInstance(
     52         Class.forName(
     53             "io.opencensus.internal.ProviderTest$PrivateClass",
     54             true,
     55             ProviderTest.class.getClassLoader()),
     56         PrivateClass.class);
     57   }
     58 
     59   @Test(expected = ServiceConfigurationError.class)
     60   public void createInstance_ThrowsErrorWhenClassHasPrivateConstructor()
     61       throws ClassNotFoundException {
     62     Provider.createInstance(
     63         Class.forName(
     64             "io.opencensus.internal.ProviderTest$PrivateConstructorClass",
     65             true,
     66             ProviderTest.class.getClassLoader()),
     67         PrivateConstructorClass.class);
     68   }
     69 
     70   @Test(expected = ServiceConfigurationError.class)
     71   public void createInstance_ThrowsErrorWhenClassDoesNotHaveDefaultConstructor()
     72       throws ClassNotFoundException {
     73     Provider.createInstance(
     74         Class.forName(
     75             "io.opencensus.internal.ProviderTest$NoDefaultConstructorClass",
     76             true,
     77             ProviderTest.class.getClassLoader()),
     78         NoDefaultConstructorClass.class);
     79   }
     80 
     81   @Test(expected = ServiceConfigurationError.class)
     82   public void createInstance_ThrowsErrorWhenClassIsNotASubclass() throws ClassNotFoundException {
     83     Provider.createInstance(
     84         Class.forName(
     85             "io.opencensus.internal.ProviderTest$GoodClass",
     86             true,
     87             ProviderTest.class.getClassLoader()),
     88         MyInterface.class);
     89   }
     90 
     91   @Test
     92   public void createInstance_GoodClass() throws ClassNotFoundException {
     93     assertThat(
     94             Provider.createInstance(
     95                 Class.forName(
     96                     "io.opencensus.internal.ProviderTest$GoodClass",
     97                     true,
     98                     ProviderTest.class.getClassLoader()),
     99                 GoodClass.class))
    100         .isNotNull();
    101   }
    102 
    103   @Test
    104   public void createInstance_GoodSubclass() throws ClassNotFoundException {
    105     assertThat(
    106             Provider.createInstance(
    107                 Class.forName(
    108                     "io.opencensus.internal.ProviderTest$MyInterfaceImpl",
    109                     true,
    110                     ProviderTest.class.getClassLoader()),
    111                 MyInterface.class))
    112         .isNotNull();
    113   }
    114 }
    115