No opportunity to append sim_option in test_case

[arnfol]

Hi! I faced this problem while trying to add an additional string in "modelsim.vsim_flags" sim option in different test cases. Basically, I have a default configuration for my entire testbench with "modelsim.vsim_flags" set. In only one test in my tb, I wanted to add some configurations, and in each configuration add a new different argument to "modelsim.vsim_flags". However, add_config method in Test does not have an overwrite argument, like set_sim_option. I was thinking about working directly with test configuration object, as it has set_sim_option method, but it does not support overwrite argument either.

[arnfol]

I added an example of what I am trying to achieve at https://github.com/malt-system/vunit/commit/1985ef2e4501a6362b02aea9b13db81e42584da5 and an ugly workaround at https://github.com/malt-system/vunit/commit/887aef36ef676c1b7b0b1af10ffc495791d84aca. I'd like to add the overwrite argument to either add_config method or test configuration's set_sim_option, or both. However, I am not sure if this is the right solution, could use a piece of advice here.

[eine]

It seems that there is a single set_sim_option which does not accept overwrite:

https://github.com/VUnit/vunit/search?q=%22def+set_sim_option%22

I'd say that moving https://github.com/VUnit/vunit/blob/c35d3dc392ef7557db1dcbba61d86753c912c635/vunit/configuration.py#L224-L227 to https://github.com/VUnit/vunit/blob/c35d3dc392ef7557db1dcbba61d86753c912c635/vunit/configuration.py#L122-L127 would be the easiest fix.

Moreover, it might be interesting to add the overwrite feature to add_config. However, just fixing set_sim_option would already provide a consistent solution.