test/com/google/inject/BinderTest.java

/**
 * Copyright (C) 2007 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 static com.google.inject.Asserts.assertContains;
import static com.google.inject.Asserts.assertNotSerializable;
import com.google.inject.name.Names;
import junit.framework.TestCase;

import java.io.IOException;
import java.util.List;

/**
 * @author crazybob@google.com (Bob Lee)
 */
public class BinderTest extends TestCase {

  Provider<Foo> fooProvider;

  public void testProviderFromBinder() {
    Guice.createInjector(new Module() {
      public void configure(Binder binder) {
        fooProvider = binder.getProvider(Foo.class);

        try {
          fooProvider.get();
        } catch (IllegalStateException e) { /* expected */ }
      }
    });

    assertNotNull(fooProvider.get());
  }

  static class Foo {}

  public void testInvalidProviderFromBinder() {
    try {
      Guice.createInjector(new Module() {
        public void configure(Binder binder) {
          binder.getProvider(Runnable.class);
        }
      });
    }
    catch (CreationException e) {
      assertEquals(1, e.getErrorMessages().size());
    }
  }

  public void testDanglingConstantBinding() {
    try {
      Guice.createInjector(new AbstractModule() {
        @Override public void configure() {
          bindConstant();
        }
      });
      fail();
    } catch (CreationException expected) {
      assertContains(expected.getMessage(), "Missing constant value.");
    }
  }

  public void testToStringOnBinderApi() {
    try {
      Guice.createInjector(new AbstractModule() {
        @Override public void configure() {
          assertEquals("Binder", binder().toString());
          assertEquals("Provider<java.lang.Integer>", getProvider(Integer.class).toString());
          assertEquals("Provider<java.util.List<java.lang.String>>",
              getProvider(Key.get(new TypeLiteral<List<String>>() {})).toString());

          assertEquals("AnnotatedBindingBuilder<java.lang.Integer>",
              bind(Integer.class).toString());
          assertEquals("LinkedBindingBuilder<java.lang.Integer>",
              bind(Integer.class).annotatedWith(Names.named("a")).toString());
          assertEquals("AnnotatedConstantBindingBuilder", bindConstant().toString());
          assertEquals("ConstantBindingBuilder",
              bindConstant().annotatedWith(Names.named("b")).toString());
        }
      });
      fail();
    } catch (CreationException ignored) {
    }
  }

  public void testNothingIsSerializableInBinderApi() {
    try {
      Guice.createInjector(new AbstractModule() {
        @Override public void configure() {
          try {
            assertNotSerializable(binder());
            assertNotSerializable(getProvider(Integer.class));
            assertNotSerializable(getProvider(Key.get(new TypeLiteral<List<String>>() {})));
            assertNotSerializable(bind(Integer.class));
            assertNotSerializable(bind(Integer.class).annotatedWith(Names.named("a")));
            assertNotSerializable(bindConstant());
            assertNotSerializable(bindConstant().annotatedWith(Names.named("b")));
          } catch (IOException e) {
            fail(e.getMessage());
          }
        }
      });
      fail();
    } catch (CreationException ignored) {
    }
  }

  /**
   * Although {@code String[].class} isn't equal to {@code new
   * GenericArrayTypeImpl(String.class)}, Guice should treat these two types
   * interchangeably.
   */
  public void testArrayTypeCanonicalization() {
    final String[] strings = new String[] { "A" };
    final Integer[] integers = new Integer[] { 1 };
    
    Injector injector = Guice.createInjector(new AbstractModule() {
      protected void configure() {
        bind(String[].class).toInstance(strings);
        bind(new TypeLiteral<Integer[]>() {}).toInstance(integers);
      }
    });

    assertSame(integers, injector.getInstance(Key.get(new TypeLiteral<Integer[]>() {})));
    assertSame(integers, injector.getInstance(new Key<Integer[]>() {}));
    assertSame(integers, injector.getInstance(Integer[].class));
    assertSame(strings, injector.getInstance(Key.get(new TypeLiteral<String[]>() {})));
    assertSame(strings, injector.getInstance(new Key<String[]>() {}));
    assertSame(strings, injector.getInstance(String[].class));

    try {
      Guice.createInjector(new AbstractModule() {
        protected void configure() {
          bind(String[].class).toInstance(strings);
          bind(new TypeLiteral<String[]>() {}).toInstance(strings);
        }
      });
      fail();
    } catch (CreationException expected) {
      Asserts.assertContains(expected.getMessage(),
          "A binding to java.lang.String[] was already configured");
      Asserts.assertContains(expected.getMessage(),
          "1 error[s]");
    }
  }

//  public void testBindInterfaceWithoutImplementation() {
//    Guice.createInjector(new AbstractModule() {
//      protected void configure() {
//        bind(Runnable.class);
//      }
//    }).getInstance(Runnable.class);
//  }
}