diff --git a/test/runtests.jl b/test/runtests.jl
index c2834ad..7dfe844 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -17,6 +17,9 @@
         @test cos_sim(wpd19, "wurden", "war") == cos_sim(wpd19, "war", "wurden")
         @test cos_sim(wpd19, "wurde", "wurden") > cos_sim(wpd19, "wurde", "ich")
         @test cos_sim(wpd19, "wurden", "war") == cos_sim(wpd19, wpd19, "war", "wurden")
+        @test isapprox(cos_sim(wpd19, wpd19, "war"), 1)
+        @test isapprox(cos_sim(wpd19, wpd19, 50), 1)
+        @test isapprox(cos_sim(wpd19, 50, 50), 1)
     end
 
     @testset "DerekoVecs.jl: knn" begin