diff --git a/test/runtests.jl b/test/runtests.jl
index e9587d61..41d32202 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -354,6 +354,9 @@ Random.seed!(0)
         @test_nowarn println(0p)
         @test_nowarn show(stdout, MIME"text/x-latex"(), 0p); println()
         @test_nowarn show(stdout, MIME"text/x-latex"(), p + im*p); println()
+        @test_nowarn show(stdout, MIME"text/x-latex"(), p - im*p); println()
+        @test_nowarn show(stdout, MIME"text/x-latex"(), im*p); println()
+        @test_nowarn show(stdout, MIME"text/x-latex"(), -im*p); println()
 
         @test_nowarn display([p, p])
         @test_nowarn println([p, p])