Control --shell on a subset of tests?

[cdleonard]

I want to have some tests to run specifically against dash and others against bash. Is there some way to do this?

After reading through the documentation it does not look like there are good options.

• It's possible to add dash-specific code in separate executables with #! /bin/dash shebang but that mostly defeats the purpose of a shell test framework. I might as well use pytest!
• It's possible to create two shellspec projects with their own .shellspec option files but I'd prefer a single test suite.
• Execute the entire test suite multiple times with different --shell arguments and skip irrelevant tests. ShellSpec itself doesn't seem to provide a way to determine the top-level --shell argument and determining the current shell is famously nasty.