Which is the highest Partnership recorded in test cricket?

In 2006, Sri Lankan Players Kumar Sangarkara and Mahela Jayawardene against South Africa created record partnership of 624 runs in test cricket. It is the highest partnership for any wicket in test cricket.

Second highest partnership for any wicket in test cricket is also created by Sri Lankan batsmen. Sanath Jayasurya and Roshan Mahanama created partnership of 576 runs  against India in 1997 which second highest.