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1   /*
2    * Copyright (c) MuleSoft, Inc.  All rights reserved.  http://www.mulesoft.com
3    * The software in this package is published under the terms of the CPAL v1.0
4    * license, a copy of which has been included with this distribution in the
5    * LICENSE.txt file.
6    */
7   package org.mule.transformer;
8   
9   import org.mule.api.transformer.Transformer;
10  import org.mule.api.transformer.TransformerException;
11  import org.mule.transformer.types.DataTypeFactory;
12  import org.mule.transport.NullPayload;
13  
14  import org.junit.Test;
15  
16  import static org.junit.Assert.fail;
17  
18  public class NullResultTestCase extends AbstractTransformerTestCase
19  {
20      private final NullResultTransformer transformer = new NullResultTransformer();
21  
22      @Override
23      public Object getTestData()
24      {
25          return new Object();
26      }
27  
28      @Override
29      public Object getResultData()
30      {
31          return NullPayload.getInstance();
32      }
33  
34      @Override
35      public Transformer getTransformer() throws Exception
36      {
37          return transformer;
38      }
39  
40      @Override
41      public Transformer getRoundTripTransformer() throws Exception
42      {
43          return null;
44      }
45  
46      @Test
47      public void testNullNotExpected() throws Exception
48      {
49          transformer.setReturnDataType(DataTypeFactory.STRING);
50          try
51          {
52              testTransform();
53              fail("Transformer should have thrown an exception because the return class doesn't match the result.");
54          }
55          catch (TransformerException e)
56          {
57              // expected
58          }
59      }
60  
61      public static final class NullResultTransformer extends AbstractTransformer
62      {
63          public NullResultTransformer()
64          {
65              super();
66              this.registerSourceType(DataTypeFactory.OBJECT);
67              this.setReturnDataType(DataTypeFactory.create(NullPayload.class));
68          }
69  
70          @Override
71          public Object doTransform(Object src, String encoding) throws TransformerException
72          {
73              return null;
74          }
75      }
76  }