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 malt-system@1985ef2 and an ugly workaround at malt-system@887aef3.
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

vunit/vunit/configuration.py

Lines 224 to 227 in c35d3dc

	if not overwrite:
	config.set_sim_option(
	name, config.sim_options.get(name, []) + value
	)

to

vunit/vunit/configuration.py

Lines 122 to 127 in c35d3dc

	def set_sim_option(self, name, value):
	"""
	Set sim option
	"""
	SIMULATOR_FACTORY.check_sim_option(name, value)
	self.sim_options[name] = copy(value)

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.