code: @Test public void testGetAcceptCharset(){
    String charset="UTF-8";
    when(httpServletRequest.getHeader("accept-charset")).thenReturn(charset);
    context.init(httpServletRequest,httpServletResponse);
    assertEquals(charset,context.getAcceptCharset());
    charset=null;
    when(httpServletRequest.getHeader("accept-charset")).thenReturn(charset);
    context.init(httpServletRequest,httpServletResponse);
    assertNull(context.getAcceptCharset());
    charset="iso-8859-5, unicode-1-1;q=0.8";
    when(httpServletRequest.getHeader("accept-charset")).thenReturn(charset);
    context.init(httpServletRequest,httpServletResponse);
    assertEquals(charset,context.getAcceptCharset());
  }
  