libcore/luni/src/test/java/libcore/java/io/FilterInputStreamNullSourceTest.java

   1 /*
   2  * Copyright (C) 2010 The Android Open Source Project
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *      http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 package libcore.java.io;
  18
  19 import java.io.BufferedInputStream;
  20 import java.io.DataInputStream;
  21 import java.io.FilterInputStream;
  22 import java.io.IOException;
  23 import java.io.InputStream;
  24 import java.io.LineNumberInputStream;
  25 import java.io.PushbackInputStream;
  26 import java.security.DigestInputStream;
  27 import java.security.MessageDigest;
  28 import java.security.NoSuchAlgorithmException;
  29 import java.util.zip.CRC32;
  30 import java.util.zip.CheckedInputStream;
  31 import java.util.zip.Inflater;
  32 import java.util.zip.InflaterInputStream;
  33 import javax.crypto.CipherInputStream;
  34 import javax.crypto.NullCipher;
  35 import junit.framework.TestCase;
  36
  37 public final class FilterInputStreamNullSourceTest extends TestCase {
  38
  39     public void testBufferedInputStream() throws IOException {
  40         assertReadsFailWithIoException(new BufferedInputStream(null));
  41         assertReadsFailWithIoException(new BufferedInputStream(null, 1024));
  42     }
  43
  44     public void testCheckedInputStream() throws IOException {
  45         assertReadsFailWithNullPointerException(new CheckedInputStream(null, new CRC32()));
  46     }
  47
  48     public void testCipherInputStream() throws IOException {
  49         InputStream in = new CipherInputStream(null, new NullCipher());
  50         try {
  51             in.read();
  52             fail();
  53         } catch (NullPointerException expected) {
  54         }
  55
  56         assertEquals(0, in.available());
  57
  58         try {
  59             in.close();
  60             fail();
  61         } catch (NullPointerException expected) {
  62         }
  63     }
  64
  65     public void testDataInputStream() throws IOException {
  66         assertReadsFailWithNullPointerException(new DataInputStream(null));
  67     }
  68
  69     public void testDigestInputStream() throws IOException, NoSuchAlgorithmException {
  70         MessageDigest md5 = MessageDigest.getInstance("MD5");
  71         assertReadsFailWithNullPointerException(new DigestInputStream(null, md5));
  72     }
  73
  74     public void testFilterInputStream() throws IOException {
  75         assertReadsFailWithNullPointerException(new FilterInputStream(null) {});
  76     }
  77
  78     public void testInflaterInputStream() throws IOException {
  79         try {
  80             new InflaterInputStream(null);
  81             fail();
  82         } catch (NullPointerException expected) {
  83         }
  84         try {
  85             new InflaterInputStream(null, new Inflater());
  86             fail();
  87         } catch (NullPointerException expected) {
  88         }
  89         try {
  90             new InflaterInputStream(null, new Inflater(), 1024);
  91             fail();
  92         } catch (NullPointerException expected) {
  93         }
  94     }
  95
  96     public void testLineNumberInputStream() throws IOException {
  97         assertReadsFailWithNullPointerException(new LineNumberInputStream(null));
  98     }
  99
 100     public void testPushbackInputStream() throws IOException {
 101         assertReadsFailWithIoException(new PushbackInputStream(null));
 102         assertReadsFailWithIoException(new PushbackInputStream(null, 1024));
 103     }
 104
 105     private void assertReadsFailWithIoException(InputStream in) throws IOException {
 106         try {
 107             in.read();
 108             fail();
 109         } catch (IOException expected) {
 110         }
 111
 112         try {
 113             in.available();
 114             fail();
 115         } catch (IOException expected) {
 116         }
 117
 118         in.close();
 119     }
 120
 121     private void assertReadsFailWithNullPointerException(InputStream in) throws IOException {
 122         try {
 123             in.read();
 124             fail();
 125         } catch (NullPointerException expected) {
 126         }
 127
 128         try {
 129             in.available();
 130             fail();
 131         } catch (NullPointerException expected) {
 132         }
 133
 134         try {
 135             in.close();
 136             fail();
 137         } catch (NullPointerException expected) {
 138         }
 139     }
 140 }