Put a seed for FBM tests

Author: theogf

test/basekernels/fbm.jl

@@ -1,12 +1,13 @@
 @testset "FBM" begin
+    rng = MersenneTwister(42)
     h = 0.3
     k = FBMKernel(h = h)
-    v1 = rand(3); v2 = rand(3)
+    v1 = rand(rng, 3); v2 = rand(rng, 3)
     @test k(v1,v2) ≈ (sqeuclidean(v1, zero(v1))^h + sqeuclidean(v2, zero(v2))^h - sqeuclidean(v1-v2, zero(v1-v2))^h)/2 atol=1e-5
 
     # kernelmatrix tests
-    m1 = rand(3,3)
-    m2 = rand(3,3)
+    m1 = rand(rng, 3, 3)
+    m2 = rand(rng, 3, 3)
     Kref = kernelmatrix(k, m1, m1)
     @test kernelmatrix(k, m1) ≈ Kref atol=1e-5
     K = zeros(3, 3)
@@ -16,8 +17,8 @@
     kernelmatrix!(K, k, m1)
     @test K ≈ Kref atol=1e-5
 
-    x1 = rand()
-    x2 = rand()
+    x1 = rand(rng)
+    x2 = rand(rng)
     @test kernelmatrix(k, x1*ones(1,1), x2*ones(1,1))[1] ≈ k(x1, x2) atol=1e-5
 
     @test repr(k) == "Fractional Brownian Motion Kernel (h = $(h))"