Add tests

Author: jiahao

test/StochasticProcess.jl

@@ -0,0 +1,22 @@
+using RandomMatrices
+using Base.Test
+
+srand(1)
+dx = 0.001
+
+p = WhiteNoiseProcess(dx)
+@test start(p) == nothing
+next(p)
+@test done(p) == false
+
+p = BrownianProcess(dx)
+@test start(p) == 0
+next(p, 0.0)
+@test done(p) == false
+
+p = AiryProcess(dx, 2.0)
+S = start(p)
+@test S == fill(-2/dx^2, 1, 1)
+next(p, S)
+@test done(p) == false
+

test/runtests.jl

@@ -4,4 +4,4 @@ using Base.Test
 srand(1)
 include("FormalPowerSeries.jl")
 include("Haar.jl")
-
+include("StochasticProcess.jl")