Add test for hover tooltip array

Author: noahrhodes

test/test_spec.jl

@@ -86,3 +86,8 @@ p5 = dataset("cars").path |> @vlplot(:point, x = :Miles_per_Gallon, y = :Acceler
 @test haskey(Vega.getparams(p5)["data"], "url")
 
 end
+
+@testset "Array tooltip data" begin
+  p10 = @vlplot(:point,x=:Horsepower,y=:Miles_per_Gallon,tooltip=[:Horsepower,"Miles_per_Gallon:q"])
+  @test isa(p10, VegaLite.VLSpec)
+end