diff --git a/Project.toml b/Project.toml
index 6369a05..c4ebb30 100644
--- a/Project.toml
+++ b/Project.toml
@@ -8,6 +8,7 @@ julia = "1"
 
 [extras]
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
+Documenter = "e30172f5-a6a5-5a46-863b-614d45cd2de4"
 
 [targets]
-test = ["Test"]
+test = ["Test", "Documenter"]
diff --git a/test/runtests.jl b/test/runtests.jl
index d85ae04..10718b9 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -1,6 +1,6 @@
 using Cowsay
 using Test
+using Documenter
 
-@testset "cowsay.jl" begin
-    # Write your tests here.
-end
+DocMeta.setdocmeta!(Cowsay, :DocTestSetup, :(using Cowsay); recursive=true)
+doctest(Cowsay)