### Question:
IOUtils { public static int wrappedReadForCompressedData(InputStream is, byte[] buf, int off, int len) throws IOException { try { return is.read(buf, off, len); } catch (IOException ie) { throw ie; } catch (Throwable t) { throw new IOException("Error while reading compressed data", t); } }  static void copyBytes(InputStream in, OutputStream out, int buffSize, boolean close); static void copyBytes(InputStream in, OutputStream out, int buffSize); static void copyBytes(InputStream in, OutputStream out, Configuration conf); static void copyBytes(InputStream in, OutputStream out, Configuration conf, boolean close); static void copyBytes(InputStream in, OutputStream out, long count,
      boolean close); static int wrappedReadForCompressedData(InputStream is, byte[] buf,
      int off, int len); static void readFully(InputStream in, byte buf[],
      int off, int len); static void skipFully(InputStream in, long len); static void cleanup(Log log, java.io.Closeable... closeables); static void closeStream(java.io.Closeable stream); static void closeSocket(Socket sock); static void writeFully(WritableByteChannel bc, ByteBuffer buf); static void writeFully(FileChannel fc, ByteBuffer buf,
      long offset);  }### Answer:
@Test public void testWrappedReadForCompressedData() throws IOException { byte[] buf = new byte[2]; InputStream mockStream = Mockito.mock(InputStream.class); Mockito.when(mockStream.read(buf, 0, 1)).thenReturn(1); Mockito.when(mockStream.read(buf, 0, 2)).thenThrow( new java.lang.InternalError()); try { assertEquals("Check expected value", 1, IOUtils.wrappedReadForCompressedData(mockStream, buf, 0, 1)); } catch (IOException ioe) { fail("Unexpected error while reading"); } try { IOUtils.wrappedReadForCompressedData(mockStream, buf, 0, 2); } catch (IOException ioe) { GenericTestUtils.assertExceptionContains( "Error while reading compressed data", ioe); } }