diff --git a/test/test_pgfplotsx.jl b/test/test_pgfplotsx.jl
index 5dc76282..9dc366b1 100644
--- a/test/test_pgfplotsx.jl
+++ b/test/test_pgfplotsx.jl
@@ -344,6 +344,7 @@ end # testset
    pl = plot(x->x, -1:1; add = raw"\node at (0,0.5) {\huge hi};", extra_kwargs = :subplot)
    @test pl[1][:extra_kwargs] == Dict(:add => raw"\node at (0,0.5) {\huge hi};")
    Plots._update_plot_object(pl)
+   @test filter(x->x isa String, axes[1].contents)[1] == raw"\node at (0,0.5) {\huge hi};"
    plot!(pl)
    @test pl[1][:extra_kwargs] == Dict(:add => raw"\node at (0,0.5) {\huge hi};")
    Plots._update_plot_object(pl)