Add failing test

Author: alisaleh65

nbs/03_dispatch.ipynb

@@ -1080,6 +1080,36 @@
     "test_eq(a2.f(()), (1,))"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "#### Using TypeDispatch With Class Methods\n",
+    "\n",
+    "You can use `TypeDispatch` when defining class methods too:"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "def m_nin(cls, x:(str,numbers.Integral)): return str(x)+'1'\n",
+    "def m_bll(cls, x:bool): cls.foo='a'\n",
+    "def m_num(cls, x:numbers.Number): return x*2\n",
+    "\n",
+    "t = TypeDispatch([m_nin,m_num,m_bll])\n",
+    "class A: f = t # set class attribute `f` equal to a TypeDispatch\n",
+    "\n",
+    "test_eq(A.f(1), '11')  #dispatch to m_nin\n",
+    "test_eq(A.f(1.), 2.)   #dispatch to m_num\n",
+    "test_is(A.f.owner, A)\n",
+    "\n",
+    "A.f(False) # this triggers t.m_bll to run, which sets A.foo to 'a'\n",
+    "test_eq(A.foo, 'a')"
+   ]
+  },
   {
    "cell_type": "markdown",
    "metadata": {},