/**
* @tests java.io.PushbackReader#unread(char[], int, int)
*/
public void test_unread_$CII_Exception_InsufficientBuffer() throws IOException {
//a pushback reader with one character buffer
pbr = new PushbackReader(new StringReader(pbString));
//if count > buffer's size , should throw IOException
try {
pbr.unread(new char[pbString.length()], 0, 2);
fail("should throw IOException");