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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *      http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  package org.apache.commons.io.output;
18  
19  import static org.junit.jupiter.api.Assertions.assertEquals;
20  import static org.junit.jupiter.api.Assertions.assertThrows;
21  import static org.mockito.Mockito.never;
22  import static org.mockito.Mockito.spy;
23  import static org.mockito.Mockito.verify;
24  
25  import java.io.IOException;
26  import java.io.Writer;
27  
28  import org.junit.jupiter.api.BeforeEach;
29  import org.junit.jupiter.api.Test;
30  
31  /**
32   * Tests {@link CloseShieldWriter}.
33   */
34  public class CloseShieldWriterTest {
35  
36      private StringBuilderWriter original;
37  
38      private Writer shielded;
39  
40      @SuppressWarnings("resource")
41      @BeforeEach
42      public void setUp() {
43          original = spy(new StringBuilderWriter());
44          shielded = CloseShieldWriter.wrap(original);
45      }
46  
47      @Test
48      public void testClose() throws IOException {
49          shielded.close();
50          verify(original, never()).close();
51          assertThrows(IOException.class, () -> shielded.write('x'), "write(c)");
52          original.write('y');
53          assertEquals(1, original.getBuilder().length());
54          assertEquals('y', original.toString().charAt(0));
55      }
56  
57  }