Between Chilbolton and Redbridge, the river was once paralleled by the Andover Canal, which was itself converted to a railway in 1865, and then in turn abandoned. Most traces of the canal have disappeared, although the remains of a stretch can still be seen between Timsbury and Romsey.
After Bigwig leads the break-out from Efrafa, the Watership rabbits are pursued by an Efrafan force led by their Chief, General Woundwort. Hazel carries out a plan devised by Blackberry which leads to their successful escape down the Test on a punt. In the text we are told that this plan would not have been possible on most rivers, but the Test's smooth-flowing, weed-free nature makes it an exception. Shortly afterwards, the punt becomes lodged on a low bridge, and the surviving rabbits are forced to swim under it to get out.