### Question:
WrappedHttpServletResponse implements Response { @Override public OutputStream getOutputStream() { try { return response.getOutputStream(); } catch (IOException e) { throw new RuntimeException("Unable to return response output stream", e); } } WrappedHttpServletResponse(HttpServletResponse response); @Override void resetCookie(String name, String path); @Override void setCookie(String name, String value, String path, String domain, int maxAge, boolean secure, boolean httpOnly); @Override void setStatus(int status); @Override void addHeader(String name, String value); @Override void setHeader(String name, String value); @Override OutputStream getOutputStream(); @Override void sendError(int code); @Override void sendError(int code, String message); @Override void end();  }### Answer:
@Test public void testGetOutputStream() throws Exception { assertNotNull(response.getOutputStream()); verify(mockResponse).getOutputStream(); }