diff --git a/testing.ipynb b/testing.ipynb
new file mode 100644
index 0000000..4b54637
--- /dev/null
+++ b/testing.ipynb
@@ -0,0 +1,71 @@
+{
+ "cells": [
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "include(\"../Hamiltonian.jl\")\n",
+    "\n",
+    "println(\"Running with \",Threads.nthreads(),\" thread(s)\")\n",
+    "println(\"Available GPUs:\")\n",
+    "println.(name.(devices()))\n",
+    "\n",
+    "T=Float32\n",
+    "\n",
+    "function V_test(r2)\n",
+    "    return -4*exp(-r2/4)\n",
+    "end\n",
+    "\n",
+    "function test(mode)\n",
+    "    for (n,N) in [(2,16),(3,8)]\n",
+    "        println(\"\\n$n-body system with N=$N\")\n",
+    "        n_image=0\n",
+    "        for L::T in 5.0:9.0\n",
+    "            print(\"L=$L\")\n",
+    "            s=system{T}(3,n,N,L,0.5)\n",
+    "            H=Hamiltonian{T}(s,V_test,0.0,n_image,mode)\n",
+    "            evals,_,_ = eig(H,5)\n",
+    "            println(real.(evals))\n",
+    "        end\n",
+    "    end\n",
+    "end"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "test(cpu_tensor)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 3,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "test(gpu_cutensor)"
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Julia 1.8.5",
+   "language": "julia",
+   "name": "julia-1.8"
+  },
+  "language_info": {
+   "file_extension": ".jl",
+   "mimetype": "application/julia",
+   "name": "julia",
+   "version": "1.8.5"
+  },
+  "orig_nbformat": 4
+ },
+ "nbformat": 4,
+ "nbformat_minor": 2
+}