We've just released a new project on logilab.org : lutin77. It's a test framework for Fortran77.
The goal of this framework is to make unit tests in fortran 77 by having few dependencies: a POSIX environment with C and fortran 77 compilers. Of course, you can use it for making integration or acceptance tests too. The 0.1 version has just been released here: http://www.logilab.org/project/lutin77
If you are new to the unit tests way of building software, I must admit it lacks examples. For an introduction to the techniques involved, you can have a look at Growing Object-Oriented Software, Guided by Tests even if mocked subroutines will be for later. But remember that if you do not like to write tests, you are probably not writing unit tests.