some tests

test/runtests.jl

 using LabGUI
+using Observables
 using Base.Test
 
-# write your own tests here
-@test 1 == 2
+##################################################
+print("Tools:\n")
+a = Observables.Observable(5.0)
+b = Observables.Observable(5.0)
+f(x) = 2*x
+g(x) = x/2
+link!(a,b, f, g)
+
+a[] = 3.0
+@test b[] == 6.0
+
+b[] = 10.6
+@test a[] == 5.3
+
+push!(b.listeners, (x) -> b.val += 1.0)
+a[] = 1.0
+@test b[] == 2.0
+
+c = Observables.Observable(5.0)
+d = Observables.Observable(5.0)
+link!(c,d, f, g, true)
+
+c[] = 3.0
+@test d[] == 6.0
+
+d[] = 10.6
+@test c[] == 5.3
+
+push!(d.listeners, (x) -> d.val += 1.0)
+c[] = 1.0
+@test d[] == 3.0
+
+
+##################################################
+print("Gridmaker:\n")
+grid = make_grid(3,5)
+@test typeof(grid) <: WebIO.Node
+@test grid.children.length==3
+@test grid.children[1].children.length==5
+
+
+##################################################