Untested test based on Julia version

[grantbruer]

The test case based on complexexample_pre_1_9.txt is not run in the CI. This makes it easy to accidentally merge a pull request that breaks for Julia 1.8.

Would it make sense to add Julia 1.8 to the CI workflow?

[oxinabox]

Does it not get caught by our CI for 1.0 and 1.6?

[grantbruer]

I don't think so. Here is the relevant test code:

TestReports.jl/test/reportgeneration.jl

Lines 14 to 23 in ec01268

	@testset "Complex Example" begin
	test_file = if VERSION >= v"1.9.0-beta4.29" # https://github.com/JuliaLang/julia/pull/48526
	"references/complexexample.txt"
	elseif VERSION >= v"1.7.0"
	"references/complexexample_pre_1_9.txt"
	else
	"references/complexexample_pre_1_7.txt"
	end
	@test_reference test_file read(`$(Base.julia_cmd()) $(@__DIR__)/example.jl`, String) |> clean_output
	end

There's complexexample.txt for Julia version 1.9 and complexexample_pre_1_7.txt for version < 1.7, which leaves complexexample_pre_1_9.txt for Julia 1.7 and 1.8.

[oxinabox]

ok, we probably should add CI for 1.8 to catch that.