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Java example source code file (RequireAtInjectOnConstructorsTest.java)

This example Java source code file (RequireAtInjectOnConstructorsTest.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

abstractmodule, anothernocxtors, creationexception, explicit, inject, injector, interface, manyconstructors, nocxtors, override, privatemodule, runtimeexception, suppresswarnings, testcase

The RequireAtInjectOnConstructorsTest.java Java example source code

/*
 * Copyright (C) 2012 Google Inc.
 *
 * 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 com.google.inject;

import junit.framework.TestCase;

/**
 * Tests for {@link Binder#requireAtInjectOnConstructors()}
 * 
 * @author sameb@google.com (Sam Berlin)
 */
public class RequireAtInjectOnConstructorsTest extends TestCase {
  
  public void testNoCxtors_explicitBinding() {
    try {
      Guice.createInjector(new AbstractModule() {
        @Override
        protected void configure() {
          bind(NoCxtors.class);
          binder().requireAtInjectOnConstructors();
        }
      });
      fail();
    } catch (CreationException ce) {
      assertEquals(1, ce.getErrorMessages().size());
      Asserts.assertContains(ce.getMessage(),
          "1) Explicit @Inject annotations are required on constructors, but "
          + NoCxtors.class.getName() + " has no constructors annotated with @Inject",
          "at " + RequireAtInjectOnConstructorsTest.class.getName() + "$", "configure");
    }
  }
  
  public void testNoCxtors_jitBinding() {
    Injector injector = Guice.createInjector(new AbstractModule() {
      @Override
      protected void configure() {
        binder().requireAtInjectOnConstructors();
      }
    });
    try {
      injector.getInstance(NoCxtors.class);
      fail();
    } catch (ConfigurationException ce) {
      Asserts.assertContains(ce.getMessage(),
          "1) Explicit @Inject annotations are required on constructors, but "
          + NoCxtors.class.getName() + " has no constructors annotated with @Inject",
          "while locating " + NoCxtors.class.getName());
    }
  }
  
  public void testNoCxtors_implicitBinding() {
    try {
      Guice.createInjector(new AbstractModule() {
        @Override
        protected void configure() {
          bind(Interface.class).to(NoCxtors.class);
          binder().requireAtInjectOnConstructors();
        }
      });
      fail();
    } catch (CreationException ce) {
      assertEquals(1, ce.getErrorMessages().size());
      Asserts.assertContains(ce.getMessage(),
          "1) Explicit @Inject annotations are required on constructors, but "
          + NoCxtors.class.getName() + " has no constructors annotated with @Inject",
          "at " + RequireAtInjectOnConstructorsTest.class.getName() + "$", "configure");
    }
  }
  
  public void testNoCxtors_inheritedByPrivateModules() {
    try {
      Guice.createInjector(new AbstractModule() {
        @Override
        protected void configure() {
          binder().requireAtInjectOnConstructors();
          install(new PrivateModule() {
            @Override
            protected void configure() {
              bind(NoCxtors.class);
            }
          });
        }
      });
      fail();
    } catch (CreationException ce) {
      assertEquals(1, ce.getErrorMessages().size());
      Asserts.assertContains(ce.getMessage(),
          "1) Explicit @Inject annotations are required on constructors, but "
          + NoCxtors.class.getName() + " has no constructors annotated with @Inject",
          "at " + RequireAtInjectOnConstructorsTest.class.getName() + "$", "configure");
    }
  }
  
  public void testNoCxtors_accumulatesAllErrors() {
    try {
      Guice.createInjector(new AbstractModule() {
        @Override
        protected void configure() {
          bind(NoCxtors.class);
          bind(AnotherNoCxtors.class);
          binder().requireAtInjectOnConstructors();
        }
      });
      fail();
    } catch (CreationException ce) {
      assertEquals(2, ce.getErrorMessages().size());
      Asserts.assertContains(ce.getMessage(),
          "1) Explicit @Inject annotations are required on constructors, but "
          + NoCxtors.class.getName() + " has no constructors annotated with @Inject",
          "at " + RequireAtInjectOnConstructorsTest.class.getName() + "$", "configure",
          "2) Explicit @Inject annotations are required on constructors, but "
          + AnotherNoCxtors.class.getName() + " has no constructors annotated with @Inject",
          "at " + RequireAtInjectOnConstructorsTest.class.getName() + "$", "configure");
    }
  }
  
  public void testNoCxtors_separateOptionsForPrivateModules() {
    try {
      Guice.createInjector(new AbstractModule() {
        @Override
        protected void configure() {
          bind(AnotherNoCxtors.class);
          install(new PrivateModule() {
            @Override
            protected void configure() {
              binder().requireAtInjectOnConstructors();
              bind(NoCxtors.class);
            }
          });
        }
      });
      fail();
    } catch (CreationException ce) {
      // This is testing that the parent module doesn't fail because it isn't included
      // in the error message.
      assertEquals(1, ce.getErrorMessages().size());
      Asserts.assertContains(ce.getMessage(),
          "1) Explicit @Inject annotations are required on constructors, but "
          + NoCxtors.class.getName() + " has no constructors annotated with @Inject",
          "at " + RequireAtInjectOnConstructorsTest.class.getName() + "$", "configure");
    }
  }
  
  public void testManyConstructorsButNoneWithAtInject() {
    try {
      Guice.createInjector(new AbstractModule() {
        @Override
        protected void configure() {
          bind(ManyConstructors.class);
          binder().requireAtInjectOnConstructors();
        }
      });
      fail();
    } catch (CreationException ce) {
      assertEquals(1, ce.getErrorMessages().size());
      Asserts.assertContains(ce.getMessage(),
          "1) Explicit @Inject annotations are required on constructors, but "
          + ManyConstructors.class.getName() + " has no constructors annotated with @Inject",
          "at " + RequireAtInjectOnConstructorsTest.class.getName() + "$", "configure");
    }
  }
  
  public void testRequireAtInjectStillAllowsToConstructorBindings() {
    Injector injector = Guice.createInjector(new AbstractModule() {
        @Override
        protected void configure() {
          try {
            bind(ManyConstructors.class)
                .toConstructor(ManyConstructors.class.getDeclaredConstructor());
          } catch (Exception e) {
            throw new RuntimeException(e);
          }
          binder().requireAtInjectOnConstructors();
        }
      });
    injector.getInstance(ManyConstructors.class);
  }
  
  private static interface Interface {}
  private static class NoCxtors implements Interface {}  
  private static class AnotherNoCxtors {}
  private static class ManyConstructors {
    @SuppressWarnings("unused") ManyConstructors() {}
    @SuppressWarnings("unused") ManyConstructors(String a) {}
    @SuppressWarnings("unused") ManyConstructors(int a) {}
  }
}

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