Testament requires the tests to be stored in a proper directories' hierarchy. For example, Nim tests: <https://github.com/nim-lang/Nim/tree/devel/tests>
Example of working structure. The tests are in `tests/directory/test.nim` and `tests/directory2/anothertest.nim`. If you have that structure, then in the main project's directory, where _project.nimble_ file is, execute the command `testament all`. Another option is to use the package _std/unittest_ (or _unittest2_ , the external package). It is similar to unit tests libraries from other languages like C++ or Java.
