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   *  regarding copyright ownership.  The ASF licenses this file
   *  to you under the Apache License, Version 2.0 (the
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  package org.apache.cayenne.di;
  
  import java.util.List;
  
  import org.junit.Test;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertFalse;
  import static org.junit.Assert.assertNotEquals;
  import static org.junit.Assert.assertTrue;
  
  public class KeyTest {
  
      @Test
      public void testEquals() {
          Key<String> key1 = Key.get(String.class);
          Key<String> key2 = Key.get(String.class);
          Key<Integer> key3 = Key.get(Integer.class);
          Key<Integer> key31 = Key.get(Integer.class, "");
          Key<Integer> key4 = Key.get(Integer.class, "a");
          Key<Integer> key5 = Key.get(Integer.class, "a");
          Key<Integer> key6 = Key.get(Integer.class, "b");
          Key<String> key7 = Key.get(String.class, "a");
  
          assertTrue(key1.equals(key2));
  
          assertFalse(key1.equals(key3));
  
          assertTrue(key3.equals(key31));
          assertTrue(key31.equals(key3));
  
          assertFalse(key3.equals(key4));
          assertFalse(key4.equals(key3));
  
          assertTrue(key4.equals(key5));
          assertTrue(key5.equals(key4));
  
          assertFalse(key5.equals(key6));
          assertFalse(key6.equals(key5));
  
          assertFalse(key4.equals(key7));
          assertFalse(key7.equals(key4));
      }
  
      @Test
      public void testListKeysEquals() {
          Key<List<Integer>> key1 = Key.getListOf(Integer.class);
          Key<List<String>> key2 = Key.getListOf(String.class);
          Key<List<Integer>> key3 = Key.getListOf(Integer.class);
          Key<List<String>> key4 = Key.getListOf(String.class);
  
          assertNotEquals(key1, key2);
          assertNotEquals(key3, key4);
  
          assertEquals(key1, key3);
          assertEquals(key1, key1);
          assertEquals(key2, key4);
          assertEquals(key4, key4);
  
          // Name is suppressing generic type, to keep backward compatibility.
          Key key5 = Key.getListOf(Object.class, "xyz");
          Key key6 = Key.getListOf(Object.class, "abc");
          assertNotEquals(key5, key6);
  
          Key key7 = Key.getListOf(Integer.class, "xyz");
          Key key8 = Key.getListOf(Integer.class, "abc");
          assertNotEquals(key7, key8);
          assertNotEquals(key5, key7);
  
          Key key9 = Key.get(List.class, "xyz");
          assertNotEquals(key7, key9);
       }
  
      @Test
      public void testHashCode() {
          Key<String> key1 = Key.get(String.class);
          Key<String> key2 = Key.get(String.class);
          Key<Integer> key3 = Key.get(Integer.class);
          Key<Integer> key4 = Key.get(Integer.class, "a");
          Key<Integer> key5 = Key.get(Integer.class, "a");
          Key<Integer> key6 = Key.get(Integer.class, "b");
          Key<String> key7 = Key.get(String.class, "a");
  
          assertTrue(
                  "generated different hashcode on second inocation",
                  key1.hashCode() == key1.hashCode());
          assertTrue(key1.hashCode() == key2.hashCode());
          assertTrue(key4.hashCode() == key5.hashCode());
  
          // these are not technically required for hashCode() validity, but as things stand
          // now, these tests will all succeed.
          assertFalse(key1.hashCode() == key3.hashCode());
          assertFalse(key4.hashCode() == key3.hashCode());
          assertFalse(key5.hashCode() == key6.hashCode());
          assertFalse(key7.hashCode() == key4.hashCode());
      }
  
      @Test
      public void testToString() {
          assertEquals("<BindingKey: java.lang.String>",
                  Key.get(String.class).toString());
          assertEquals("<BindingKey: java.lang.String, 'xyz'>",
                  Key.get(String.class, "xyz").toString());
          assertEquals("<BindingKey: java.util.List[java.lang.String]>",
                  Key.getListOf(String.class).toString());
          assertEquals("<BindingKey: java.util.List[java.lang.String], 'xyz'>",
                  Key.getListOf(String.class, "xyz").toString());
      }
  }
  