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   *  to you under the Apache License, Version 2.0 (the
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  package org.apache.cayenne.query;
  
  import org.apache.cayenne.map.ObjEntity;
  import org.apache.cayenne.testdo.testmap.Artist;
  import org.junit.Test;
  
  import static org.junit.Assert.assertNull;
  import static org.junit.Assert.assertSame;
  import static org.junit.Assert.fail;
  
  public class AbstractQueryTest {
  
      @Test
      public void testSetRootEntityName() {
          AbstractQuery query = new MockAbstractQuery();
          assertNull(query.getRoot());
          query.setRoot("SomeEntity");
          assertSame("SomeEntity", query.getRoot());
      }
  
      @Test
      public void testSetRootObjEntity() {
          AbstractQuery query = new MockAbstractQuery();
  
          assertNull(query.getRoot());
          ObjEntity e = new ObjEntity("ABC");
          query.setRoot(e);
          assertSame(e, query.getRoot());
      }
  
      @Test
      public void testSetRootClass() {
          AbstractQuery query = new MockAbstractQuery();
          assertNull(query.getRoot());
          query.setRoot(Artist.class);
          assertSame(Artist.class, query.getRoot());
      }
  
      @Test
      public void testSetInvalidRoot() {
          AbstractQuery query = new MockAbstractQuery();
          assertNull(query.getRoot());
          try {
              query.setRoot(1);
              fail("Should not be able to set the root to an Integer");
          }
          catch (IllegalArgumentException e) {
          }
      }
  }
  