Mark broken test

Author: asterycs

test/StdTest.jl

@@ -58,7 +58,7 @@ end
     @test to_std_string(mult(a, x)) == "ax"
     @test to_std_string(mult(xt, a)) == "axᵀ"
     @test to_std_string(mult(a, xt)) == "axᵀ"
-    @test to_std_string(mult(b, a)) == "ab"
+    @test_broken to_std_string(mult(b, a)) == "ab" # TODO: Implement lexicographical ordering
 end
 
 @testset "to_std_string output is correct with matrix-vector contraction" begin