Unmanned Salyut Class Soyuz
Cosmos 496, 26 June - 2 July 1972. Unmanned test of the redesigned Soyuz. It did not dock with any space station. Cosmos 496 retained the solar arrays from earlier Soyuz vehicles.
Cosmos 573, 15-17 June 1973. A second unmanned test of the Soyuz ferry. This version did not retain the solar arrays. Like the previous test, there was no space station docking.
Cosmos 613, 30 November 1973 - 29 January 1974.This was a long duration orbital storage test of the Soyuz ferry in preparation for long term stays at a space station.
In 1978/79, there were two test flights of the new Soyuz T ferry.
Cosmos 1001, 4-15 April 1978. This was the first unmanned Soyuz T test.