autotest: avoid use of non-ascii characters in test output

[peterbarker]

AT-0741.0: Exception caught: RLL_RATE_D expected 0.070284 ± 2.000000% (0.068878 to 0.071690) got 0.09136922657489777 with 29.999993% error
Traceback (most recent call last):
  File "/__w/ardupilot/ardupilot/Tools/autotest/vehicle_test_suite.py", line 8915, in run_one_test_attempt
    test_function(**test_kwargs)
  File "/__w/ardupilot/ardupilot/Tools/autotest/arduplane.py", line 4373, in AUTOTUNE
    self.check_parameter_value("RLL_RATE_D", 0.070284024, 2)
  File "/__w/ardupilot/ardupilot/Tools/autotest/vehicle_test_suite.py", line 6302, in check_parameter_value
    raise ValueError("%s expected %f ± %f%% (%f to %f) got %s with %f%% error" % (
ValueError: RLL_RATE_D expected 0.070284 ± 2.000000% (0.068878 to 0.071690) got 0.09136922657489777 with 29.999993% error

>>>> FAILED STEP: test.PlaneTests1b at Wed Mar 12 10:07:55 2025 ('ascii' codec can't encode character '\xb1' in position 58: ordinal not in range(128))
Traceback (most recent call last):
  File "/__w/ardupilot/ardupilot/Tools/autotest/vehicle_test_suite.py", line 8915, in run_one_test_attempt
    test_function(**test_kwargs)
  File "/__w/ardupilot/ardupilot/Tools/autotest/arduplane.py", line 4373, in AUTOTUNE
    self.check_parameter_value("RLL_RATE_D", 0.070284024, 2)
  File "/__w/ardupilot/ardupilot/Tools/autotest/vehicle_test_suite.py", line 6302, in check_parameter_value
    raise ValueError("%s expected %f ± %f%% (%f to %f) got %s with %f%% error" % (
ValueError: RLL_RATE_D expected 0.070284 ± 2.000000% (0.068878 to 0.071690) got 0.09136922657489777 with 29.999993% error

[MattKear]

The changes look fine to me, however there does not look to be any functional changes here, so it won't help with the failing auto tests that you posted above. I am not sure of the intent of this PR though?

[peterbarker]

The changes look fine to me, however there does not look to be any functional changes here, so it won't help with the failing auto tests that you posted above. I am not sure of the intent of this PR though?

It fixes the cascading error. ie. the problem only happens when something else fails. I'm not fixing that "something else" in this PR, just the cascading failure :-)