error running tutorial: decorated test ('MyTest') is an abstract test

While exploring the tutorials, I tried to run the example

import reframe as rfm
import reframe.utility as util


@rfm.simple_test
class MyTest(rfm.RegressionTest):
    module_info = parameter(util.find_modules('GROMACS'))

    def __init__(self):
        s, e, m = self.module_info
        self.valid_systems = [s]
        self.valid_prog_environs = [e]
        self.modules = [m]

found at https://reframe-hpc.readthedocs.io/en/v3.5.1/tutorial_advanced.html but I got an error:

$ reframe -c gromacs.py -r
[ReFrame Setup]
  version:           3.5.1
  command:           '/nethome/mabraham/anaconda3/envs/gmxbm/bin/reframe -c gromacs.py -r'
  launched by:       mabraham@dev-gpu06
  working directory: '/nethome/mabraham/amd-gpu-benchmarks/runs'
  settings file:     '<builtin>'
  check search path: '/nethome/mabraham/amd-gpu-benchmarks/runs/gromacs.py'
  stage directory:   '/nethome/mabraham/amd-gpu-benchmarks/runs/stage'
  output directory:  '/nethome/mabraham/amd-gpu-benchmarks/runs/output'

/nethome/mabraham/anaconda3/envs/gmxbm/bin/reframe: run session stopped: value error: ../../anaconda3/envs/gmxbm/lib/python3.9/site-packages/reframe/core/decorators.py:88: decorated test ('MyTest') is an abstract test
        raise ValueError(f'decorated test ({cls.__qualname__!r}) is an'

Did I do something wrong? How should I make the example work?

[jjotero]

You can test if the util.find_modules is working by popping the @rfm.simple_test and doing

class MyTest(rfm.RegressionTest):
   ...

print(MyTest.param_space['module_info'])

This last print should show you what the values of the module_info parameter are.

[mabraham]

Perhaps we should issue a warning if users end up asking module operations from nomod.

Yes that would be useful