Is it possible to handle variants only for some tests from cli interface?

[WiseLord]

Hello all.

I have some "tests.py" with two test classes I called MuxTest and NoMuxTest:

#!/usr/bin/env python3

from avocado import Test

class MuxTest(Test):
    """
    :avocado: tags=mux
    :param dut: IP address or hostname of DUT
    """
    def test_hw(self):
        dut = self.params.get('dut', default='localhost')

        self.log.debug("Running with dut `%s` ", dut)

class NoMuxTest(Test):
    """
    :avocado: tags=nomux
    """
    def test_nomux(self):
        self.log.debug("Running nomux test")

I want to run tests from MuxTest several times with different options (for dut parameter), while tests from NoMuxTest should be run only once (they don't have any parameters for change).

I'm able to do it with python avocado interface using Job/TestSuite:

dict_variants.py:

import sys

from avocado.core.job import Job
from avocado.core.suite import TestSuite

MUX_CONFIG = {
    "resolver.references": ["tests.py:MuxTest"],
    "run.dict_variants.variant_id_keys": ["dut"],
    "run.dict_variants": [
        {"dut": "rpi-arm-v7l"},
        {"dut": "de0-nano-soc"},
        {"dut": "stm32mp15x"}
    ],
    "run.max_parallel_tasks": 1,
}

NOMUX_CONFIG = {
    "resolver.references": ["tests.py:NoMuxTest"],
    "run.max_parallel_tasks": 1,
}

with Job(
    test_suites=[
        TestSuite.from_config(MUX_CONFIG, name="mux"),
        TestSuite.from_config(NOMUX_CONFIG, name="nomux"),
    ]
) as j:
    sys.exit(j.run())

It works like expected. When running dict_variants.py I get:

$ ./dict_variants.py 
JOB ID     : 37bc94579fe96aad053439615ce4f76ffb91406a
JOB LOG    : /home/wiselord/avocado/job-results/job-2023-06-16T13.21-37bc945/job.log
 (mux-1/3) mtda.py:MuxTest.test_hw;rpi-arm-v7l: STARTED
 (mux-1/3) mtda.py:MuxTest.test_hw;rpi-arm-v7l: PASS (0.01 s)
 (mux-2/3) mtda.py:MuxTest.test_hw;de0-nano-soc: STARTED
 (mux-2/3) mtda.py:MuxTest.test_hw;de0-nano-soc: PASS (0.01 s)
 (mux-3/3) mtda.py:MuxTest.test_hw;stm32mp15x: STARTED
 (mux-3/3) mtda.py:MuxTest.test_hw;stm32mp15x: PASS (0.01 s)
 (nomux-1/1) mtda.py:NoMuxTest.test_nomux: STARTED
 (nomux-1/1) mtda.py:NoMuxTest.test_nomux: PASS (0.01 s)
RESULTS    : PASS 4 | ERROR 0 | FAIL 0 | SKIP 0 | WARN 0 | INTERRUPT 0 | CANCEL 0
JOB TIME   : 1.98 s

So, mtda.py:MuxTest.test_hw is run 3 times with different parameters, while mtda.py:NoMuxTest.test_nomux is run only once, as I wanted.

My question is the following:

Is it possible to achieve the same behaviour using avocado's CLI (e.g. by executing "avocado run mtda.py ...")?

I tried to experiment, but either variants are applied for both tests (so, I have 6 runs totally), or to none of them (so I have 2 simple runs with default parameters).