/*
    * Copyright (C) 2011 The Guava Authors
    *
    * 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.common.reflect;
  
  import com.google.common.testing.EqualsTester;
  import com.google.common.testing.NullPointerTester;
  
  import junit.framework.TestCase;
  
  import java.lang.reflect.Method;
  import java.lang.reflect.TypeVariable;
  
  /**
   * Unit test for {@link TypeParameter}.
   *
   * @author Ben Yu
   */
  public class TypeParameterTest extends TestCase {
  
    public <T> void testCaptureTypeParameter() throws Exception {
      TypeVariable<?> variable = new TypeParameter<T>() {}.typeVariable;
      TypeVariable<?> expected = TypeParameterTest.class
          .getDeclaredMethod("testCaptureTypeParameter")
          .getTypeParameters()[0];
      assertEquals(expected, variable);
    }
  
    public void testConcreteTypeRejected() {
      try {
        new TypeParameter<String>() {};
        fail();
      } catch (IllegalArgumentException expected) {}
    }
  
    public <A, B> void testEquals() throws Exception {
      Method method = TypeParameterTest.class.getDeclaredMethod("testEquals");
      new EqualsTester()
          .addEqualityGroup(
              new TypeParameter<A>() {}, new TypeParameter<A>() {})
          .addEqualityGroup(new TypeParameter<B>() {})
          .testEquals();
    }
  
    public void testNullPointers() {
      new NullPointerTester().testAllPublicStaticMethods(TypeParameter.class);
    }
  }