diff --git a/test/run_simulation.jl b/test/run_simulation.jl
index 6ce755fb3b6383021c9fee59ad0befdfd97fec95..0faa30d3183b3c7af1139316c08bb130022a37dd 100644
--- a/test/run_simulation.jl
+++ b/test/run_simulation.jl
@@ -1,5 +1,8 @@
 
 using Test
+using Plots
+ENV["GKSwstype"] = "nul"
+default(show = false, reuse = true)
 import MarkovProcesses: get_module_path
 
 str_dir_pics = get_module_path() * "/test/simulation/res_pics"