fix test_model returns list of test summaries not single summary

Author: FynnBe

example/model_usage.ipynb

@@ -151,15 +151,15 @@
     "# before using a model, it is recommended to check that it properly works with this function\n",
     "# 'test_model' returns a dict with 'status'='passed'/'failed' and more detailed information\n",
     "from bioimageio.core.resource_tests import test_model\n",
-    "test_result = test_model(model_resource)\n",
-    "if test_result[\"status\"] == \"failed\":\n",
-    "    print(\"model test:\", test_result[\"name\"])\n",
-    "    print(\"The model test failed with:\", test_result[\"error\"])\n",
-    "    print(\"with the traceback:\")\n",
-    "    print(\"\".join(test_result[\"traceback\"]))\n",
-    "else:\n",
-    "    test_result[\"status\"] == \"passed\"\n",
-    "    print(\"The model passed all tests\")"
+    "for test_result in test_model(model_resource):\n",
+    "    if test_result[\"status\"] == \"failed\":\n",
+    "        print(\"model test:\", test_result[\"name\"])\n",
+    "        print(\"The model test failed with:\", test_result[\"error\"])\n",
+    "        print(\"with the traceback:\")\n",
+    "        print(\"\".join(test_result[\"traceback\"]))\n",
+    "    else:\n",
+    "        test_result[\"status\"] == \"passed\"\n",
+    "        print(\"The model passed all tests\")"
    ]
   },
   {