diff --git a/src/contours.jl b/src/contours.jl
index e01d2200..f9ab0954 100644
--- a/src/contours.jl
+++ b/src/contours.jl
@@ -1,5 +1,20 @@
 
 
+# TODO:
+"""
+- load Contours.jl similar to DataFrames
+- method to build grid from x/y/z vectors
+- method to wrap contours creation
+- method to plot contours as custom shapes (TODO: create Stroke and Fill types and add markerstroke/markerfill args)
+
+"""
+
+
+
+# # ----------------------------------------------------------
+# # ----------------------------------------------------------
+
+
 # immutable Vertex
 #   x::Float64
 #   y::Float64
diff --git a/test/imgcomp.jl b/test/imgcomp.jl
new file mode 100644
index 00000000..12f4361f
--- /dev/null
+++ b/test/imgcomp.jl
@@ -0,0 +1,85 @@
+
+# macro test_approx_eq_sigma_eps(A, B, sigma, eps)
+
+include("../docs/example_generation.jl")
+
+
+# # make and display one plot
+# function test_examples(pkg::Symbol, idx::Int; debug = true)
+#   Plots._debugMode.on = debug
+#   println("Testing plot: $pkg:$idx:$(examples[idx].header)")
+#   backend(pkg)
+#   backend()
+#   map(eval, examples[idx].exprs)
+#   plt = current()
+#   gui(plt)
+#   plt
+# end
+
+using Plots, Gtk.ShortNames
+
+function makeImageWidget(fn)
+  img = @Image(fn)
+  vbox = @Box(:v)
+  push!(vbox, img)
+  show(img)
+  vbox
+end
+
+"Show a Gtk popup with both images and a confirmation whether we should replace the new image with the old one"
+function isTempImageCorrect(tmpfn, reffn)
+
+  # add the images
+  imgbox = @Box(:h)
+  push!(imgbox, makeImageWidget(tmpfn))
+  push!(imgbox, makeImageWidget(reffn))
+
+  # add the buttons
+  keepbtn = @Button("KEEP")
+  overwritebtn = @Button("OVERWRITE")
+  btnbox = @Box(:h)
+  push!(btnbox, keepbtn)
+  push!(btnbox, overwritebtn)
+
+  # create the window
+  box = @Box(:v)
+  push!(box, imgbox)
+  push!(box, btnbox)
+  w = @Window(@Frame(box))
+end
+
+
+function image_comparison_tests(pkg::Symbol, idx::Int; debug = true)
+  
+  # first 
+  Plots._debugMode.on = debug
+  info("Testing plot: $pkg:$idx:$(examples[idx].header)")
+  backend(pkg)
+  backend()
+  map(eval, PlotExamples.examples[idx].exprs)
+
+  # save the png
+  tmpfn = tempname() * ".png"
+  png(tmpfn)
+
+  # load the saved png
+  tmpimg = imread(tmpfn)
+
+  # load the reference image
+  reffn = joinpath(Pkg.dir("Plots"), "test", "refimg", pkg, "$idx.png")
+  refimg = imread(reffn)
+
+  # run the test
+  @test_approx_eq_sigma_eps(tmpimg, refimg, sigma, eps)
+end
+
+function image_comparison_tests(pkg::Symbol; debug = false)
+  for i in 1:length(PlotExamples.examples)
+    # try
+    image_comparison_tests(pkgname, i, debug=debug)
+    # catch ex
+    #   # TODO: put error info into markdown?
+    #   warn("Example $pkgname:$i:$(examples[i].header) failed with: $ex")
+    # end
+  end
+end