diff --git a/src/args.jl b/src/args.jl
index 5509391e..fa0df7e7 100644
--- a/src/args.jl
+++ b/src/args.jl
@@ -55,19 +55,3 @@ function getPlotKeywordArgs(kw, i::Int)
   kw
 end
 
-# const DEFAULT_axis = LINE_AXES[1]
-# const DEFAULT_color = :auto
-# const DEFAULT_label = "AUTO"
-# const DEFAULT_width = 2
-# const DEFAULT_linetype = LINE_TYPES[1]
-# const DEFAULT_linestyle = LINE_STYLES[1]
-# const DEFAULT_marker = LINE_MARKERS[1]
-# const DEFAULT_markercolor = :auto
-# const DEFAULT_markersize = 10
-# const DEFAULT_heatmap_n = 100
-# const DEFAULT_heatmap_c = (0.15, 0.5)
-
-# const DEFAULT_title = ""
-# const DEFAULT_xlabel = ""
-# const DEFAULT_ylabel = ""
-# const DEFAULT_yrightlabel = ""
diff --git a/test/runtests.jl b/test/runtests.jl
index 8cbe76e2..1964e034 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -25,12 +25,30 @@ facts("Qwt") do
 
   # plot(x::AVec, y::AMat; kw...)              # multiple lines (one per column of x), all sharing x (will assert length(x) == size(y,1))
   @fact plot(sort(rand(10)), rand(Int, 10, 3)) --> not(nothing)
+  @fact_throws(plot!(rand(10), rand(9,2)))
 
   # plot(x::AMat, y::AMat; kw...)              # multiple lines (one per column of x/y... will assert size(x) == size(y))
+  @fact plot!(rand(10,3), rand(10,3)) --> not(nothing)
+  @fact_throws plot!(rand(10,3), rand(10,2))
+
   # plot(x::AVec, f::Function; kw...)          # one line, y = f(x)
+  @fact plot(1:10, sin) --> not(nothing)
+  @fact currentPlot().o.lines[1].y --> sin(collect(1:10))
+
   # plot(x::AMat, f::Function; kw...)          # multiple lines, yᵢⱼ = f(xᵢⱼ)
+  @fact plot(rand(10,2), sin) --> not(nothing)
+  @fact length(currentPlot().o.lines) --> 2
+
   # plot(x::AVec, fs::AVec{Function}; kw...)   # multiple lines, yᵢⱼ = fⱼ(xᵢ)
+  @fact plot(1:10, Function[sin,cos]) --> not(nothing)
+  @fact currentPlot().o.lines[1].y --> sin(collect(1:10))
+  @fact currentPlot().o.lines[1].y --> cos(collect(1:10))
+
   # plot(y::AVec{AVec}; kw...)                 # multiple lines, each with x = 1:length(y[i])
+  @fact plot((11:20, rand(10))) --> not(nothing)
+  @fact currentPlot().o.lines[1].x[4] --> 4
+  @fact currentPlot().o.lines[1].y[4] --> 14
+
   # plot(x::AVec, y::AVec{AVec}; kw...)        # multiple lines, will assert length(x) == length(y[i])
   # plot(x::AVec{AVec}, y::AVec{AVec}; kw...)  # multiple lines, will assert length(x[i]) == length(y[i])
   # plot(n::Integer; kw...)                    # n lines, all empty (for updating plots)