You easily can trace them back to whichever test method(s) use that result because the name of the result will be in the test method(s). It's not like there are going to be millions of references.

But if you want to go one step further, maybe the result file name (not just the path) should default to the name of the test (with all the [Tt]est_ prefix nonsense removed) but can be overridden.
```
def test_transverse_mercator(self):
    ...
    # Uses '.../unit/fileformats/netcdf/Saver/write/transverse_mercator.cdl'
    self.assertCML(cube, self.result_path())

def test_little_endian(self):
    ...
    # Uses '.../unit/fileformats/netcdf/Saver/write/endian.cdl'
    self.assertCML(cube, self.result_path('endian.cdl'))
```