add tests for default function

src/consts.jl

@@ -50,6 +50,7 @@ const _magic_axis_args = [:axis, :tickfont, :guidefont, :grid, :minorgrid]
 const _magic_subplot_args =
     [:title_font, :legend_font, :legend_title_font, :plot_title_font, :colorbar_titlefont]
 const _magic_series_args = [:line, :marker, :fill]
+const _all_magic_args = sort(union(_magic_axis_args, _magic_series_args, _magic_subplot_args))
 
 const _all_axis_args = sort(union([_axis_args; _magic_axis_args]))
 const _all_subplot_args = sort(union([_subplot_args; _magic_subplot_args]))

test/test_defaults.jl

@@ -12,6 +12,13 @@ end
 empty!(PLOTS_DEFAULTS)
 Plots.__init__()
 
+@testset "default" begin
+    default(fillrange=0)
+    @test Plots._series_defaults[:fillrange] == 0
+    pl = plot(1:5)
+    @test pl[1][1][:fillrange] == 0
+end
+
 @testset "Legend defaults" begin
     p = plot()
     @test p[1][:legend_font_family] == "sans-serif"