aremily commented on a change in pull request #99:
URL: https://github.com/apache/commons-crypto/pull/99#discussion_r417450230



##########
File path: 
src/test/java/org/apache/commons/crypto/stream/AbstractCipherStreamTest.java
##########
@@ -197,46 +224,236 @@ protected void doByteBufferRead(final String 
cipherClass, final boolean withChan
                 getCipher(cipherClass), smallBufferSize, iv, withChannel);
         buf.clear();
         byteBufferReadCheck(in, buf, 11);
+        in.close();      
+        
+        // Direct buffer, default buffer size, initial buffer position is 0, 
final read
+        in = getCryptoInputStream(new ByteArrayInputStream(encData),
+                getCipher(cipherClass), smallBufferSize, iv, withChannel);
+        buf.clear();
+        byteBufferFinalReadCheck(in, buf, 0);
+        in.close();
+        
+        // Default buffer size, initial buffer position is 0, insufficient 
dest buffer length
+        in = getCryptoInputStream(new ByteArrayInputStream(encData),
+                getCipher(cipherClass), defaultBufferSize, iv, withChannel);
+        buf = ByteBuffer.allocate(100);
+        byteBufferReadCheck(in, buf, 0);
+        in.close();
+        
+        // Default buffer size, initial buffer position is 0
+        in = getCryptoInputStream(transformation, props, new 
ByteArrayInputStream(encData), key, 
+                new IvParameterSpec(iv), withChannel);
+        buf = ByteBuffer.allocate(dataLen + 100);
+        byteBufferReadCheck(in, buf, 0);
+        in.close();
+        
+        // Default buffer size, initial buffer position is not 0
+        in = getCryptoInputStream(transformation, props, new 
ByteArrayInputStream(encData), key, 
+                new IvParameterSpec(iv), withChannel);
+        buf.clear();
+        byteBufferReadCheck(in, buf, 11);
+        in.close();
+
+        // Small buffer size, initial buffer position is 0
+        in = getCryptoInputStream(transformation, props, new 
ByteArrayInputStream(encData), key, 
+                new IvParameterSpec(iv), withChannel);
+        buf.clear();
+        byteBufferReadCheck(in, buf, 0);
+        in.close();
+
+        // Small buffer size, initial buffer position is not 0
+        in = getCryptoInputStream(transformation, props, new 
ByteArrayInputStream(encData), key, 
+                new IvParameterSpec(iv), withChannel);
+        buf.clear();
+        byteBufferReadCheck(in, buf, 11);
+        in.close();
+
+        // Direct buffer, default buffer size, initial buffer position is 0
+        in = getCryptoInputStream(transformation, props, new 
ByteArrayInputStream(encData), key, 
+                new IvParameterSpec(iv), withChannel);
+        buf = ByteBuffer.allocateDirect(dataLen + 100);
+        byteBufferReadCheck(in, buf, 0);
+        in.close();
+
+        // Direct buffer, default buffer size, initial buffer position is not 0
+        in = getCryptoInputStream(transformation, props, new 
ByteArrayInputStream(encData), key, 
+                new IvParameterSpec(iv), withChannel);
+        buf.clear();
+        byteBufferReadCheck(in, buf, 11);
+        in.close();
+
+        // Direct buffer, small buffer size, initial buffer position is 0
+        in = getCryptoInputStream(transformation, props, new 
ByteArrayInputStream(encData), key, 
+                new IvParameterSpec(iv), withChannel);
+        buf.clear();
+        byteBufferReadCheck(in, buf, 0);
+        in.close();
+
+        // Direct buffer, small buffer size, initial buffer position is not 0
+        in = getCryptoInputStream(transformation, props, new 
ByteArrayInputStream(encData), key, 
+                new IvParameterSpec(iv), withChannel);
+        buf.clear();
+        byteBufferReadCheck(in, buf, 11);
+        in.close();
+        
+        // Direct buffer, default buffer size, initial buffer position is 0, 
final read
+        in = getCryptoInputStream(transformation, props, new 
ByteArrayInputStream(encData), key, 
+                new IvParameterSpec(iv), withChannel);
+        buf.clear();
+        byteBufferFinalReadCheck(in, buf, 0);
+        in.close();
+        
+        // Default buffer size, initial buffer position is 0, insufficient 
dest buffer length
+        in = getCryptoInputStream(transformation, props, new 
ByteArrayInputStream(encData), key, 
+                new IvParameterSpec(iv), withChannel);
+        buf = ByteBuffer.allocate(100);
+        byteBufferReadCheck(in, buf, 0);
         in.close();
     }
 
     protected void doByteBufferWrite(final String cipherClass,
-            final ByteArrayOutputStream baos, final boolean withChannel) 
throws Exception {
+            final ByteArrayOutputStream baos, final boolean withChannel) 
+                throws Exception {
         if (AbstractCipherTest.OPENSSL_CIPHER_CLASSNAME.equals(cipherClass)) {
             if (!Crypto.isNativeCodeLoaded()) {
                 return; // Skip this test if no JNI
             }
         }
         baos.reset();
-        final CryptoOutputStream out = getCryptoOutputStream(baos,
+        CryptoOutputStream out = getCryptoOutputStream(baos,
                 getCipher(cipherClass), defaultBufferSize, iv, withChannel);
-        ByteBuffer buf = ByteBuffer.allocateDirect(dataLen / 2);
-        buf.put(data, 0, dataLen / 2);
-        buf.flip();
-        final int n1 = out.write(buf);
-
-        buf.clear();
-        buf.put(data, n1, dataLen / 3);
-        buf.flip();
-        final int n2 = out.write(buf);
-
-        buf.clear();
-        buf.put(data, n1 + n2, dataLen - n1 - n2);
-        buf.flip();
-        final int n3 = out.write(buf);
+        doByteBufferWrite(out, withChannel);
+        
+        baos.reset();
+        CryptoCipher cipher = getCipher(cipherClass);
+        String transformation = cipher.getAlgorithm();
+        out = getCryptoOutputStream(transformation, props, baos, key, 
+                new IvParameterSpec(iv), withChannel);
+        doByteBufferWrite(out, withChannel);
+        out.write(1);
+        Assert.assertTrue(out.isOpen()); 
+        
+        out = getCryptoOutputStream(transformation, props, baos, key, 
+                new IvParameterSpec(iv), withChannel);
+        out.close();
+        Assert.assertTrue(!out.isOpen());
+    }
 
-        Assert.assertEquals(dataLen, n1 + n2 + n3);
+    protected void doExceptionTest(final String cipherClass, 
ByteArrayOutputStream baos,
+            final boolean withChannel) throws IOException {
+        if (AbstractCipherTest.OPENSSL_CIPHER_CLASSNAME.equals(cipherClass)) {
+            if (!Crypto.isNativeCodeLoaded()) {
+                return; // Skip this test if no JNI
+            }
+        }
+        
+        InputStream in = null;
+        OutputStream out = null;
+        try { // Test InvalidAlgorithmParameters
+               in = getCryptoInputStream(transformation, props, new 
ByteArrayInputStream(encData), 
+                    new SecretKeySpec(key, "AES"), new GCMParameterSpec(0, new 
byte[0]), 
+                    withChannel);
+            Assert.fail("Expected IOException.");
+        } catch (IOException ex) {
+            Assert.assertEquals(ex.getMessage(),"Illegal parameters");
+        } 
+        
+        try { // Test InvalidAlgorithmParameters
+            out = getCryptoOutputStream(transformation, props, baos, 
+                    new SecretKeySpec(key, "AES"), new GCMParameterSpec(0, 
+                    new byte[0]), withChannel);
+            Assert.fail("Expected IOException.");
+        } catch (IOException ex) {
+               Assert.assertEquals(ex.getMessage(),"Illegal parameters");
+        } 
+        
+        try { // Test Invalid Key
+            in = getCryptoInputStream(transformation,props, new 
ByteArrayInputStream(encData), 
+                    new SecretKeySpec(new byte[10], "AES"), new 
IvParameterSpec(iv), withChannel);
+            Assert.fail("Expected IOException for Invalid Key");
+        } catch (IOException ex) {
+            Assert.assertNotNull(ex);
+        }
+        
+        try { // Test Invalid Key
+            out = getCryptoOutputStream(transformation, props, baos, new 
byte[10], 
+                    new IvParameterSpec(iv), withChannel);
+            Assert.fail("Expected IOException for Invalid Key");
+        } catch (IOException ex) {
+            Assert.assertNotNull(ex);
+        }
+        
+        try { // Test closed stream.
+            in = getCryptoInputStream(new ByteArrayInputStream(encData), 
+                    getCipher(cipherClass), defaultBufferSize, iv, 
withChannel);
+            in.close();
+            in.close(); // Don't throw exception.
+            in.read(); // Throw exception.

Review comment:
       Sure.




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