Codecov/Coveralls reports wrongly showing 100% coverage

Although it would be great, I definitely don’t have 100% test coverage. See an example commit report here and the git repo at that commit here. Any idea what may be going wrong here?

Same here for FourierFlows.jl.
Apparently v0.7+ is problematic with coverage… see, e.g., https://github.com/JuliaLang/julia/issues/28192