bt = backtrace()
have_backtrace = false
for l in bt
    lkup = ccall(:jl_lookup_code_address, Any, (Ptr{Void},), l)
    if lkup[1] == :backtrace
        @test lkup[4] == false # fromC
        have_backtrace = true
        break
    end
end

@test have_backtrace

# these could fail on an embedded installation
# but for now, we don't handle that case
dlls = Libdl.dllist()
@test !isempty(dlls)
@test length(dlls) > 3 # at a bare minimum, probably have some version of libstdc, libgcc, libjulia, ...
@test Base.samefile(Libdl.dlpath(dlls[1]), dlls[1])
@test Base.samefile(Libdl.dlpath(dlls[end]), dlls[end])
@test length(filter(dlls) do dl
        return ismatch(Regex("^libjulia(?:.*)\.$(Libdl.dlext)(?:\..+)?\$"), basename(dl))
    end) == 1 # look for something libjulia-like (but only one)