Fix failure, add test

Author: gustaphe

Project.toml

@@ -12,8 +12,8 @@ RecipesBase = "3cdcf5f2-1ef4-517c-9805-6587b60abb01"
 
 [compat]
 Intervals = "0.5, 1.0, 1.3"
-RecipesBase = "0.7, 0.8, 1"
 OffsetArrays = "1"
+RecipesBase = "0.7, 0.8, 1"
 julia = "1"
 
 [extras]

src/show.jl

@@ -214,7 +214,7 @@ function printcoefficient(io::IO, pj::Complex{T}, j, mimetype) where {T}
 
     if hasreal && hasimag
         print(io,"(",a)
-        print(printsign(io,b,false,mimetype),imagsymbol,")")
+        print(io,printsign(io,b,false,mimetype),imagsymbol,")")
     elseif hasreal
         (j==0 || showone(T) || a != one(T)) && printcoefficient(io, a, j, mimetype)
     elseif hasimag

test/StandardBasis.jl

@@ -805,6 +805,7 @@ end
         @test printpoly_to_string(P([1,2,3], "y"), descending_powers = true) == "3*y^2 + 2*y + 1"
         @test printpoly_to_string(P([2, 3, 1], :z), descending_powers = true, offset = -2) == "1 + 3*z^-1 + 2*z^-2"
         @test printpoly_to_string(P([-1, 0, 1], :z), offset = -1, descending_powers = true) == "z - z^-1"
+        @test printpoly_to_string(P([complex(1,1),complex(1,-1)]),MIME"text/latex"()) == "(1 + 1i) + (1 - 1i)\\cdot x"
     end
 end