Test image sorting

Ref https://github.com/GNS3/gns3-gui/issues/2030

gns3server/controller/compute.py

@@ -23,6 +23,7 @@ import json
 import uuid
 import sys
 import io
+from operator import itemgetter
 
 from ..utils import parse_version
 from ..utils.images import list_images
@@ -602,7 +603,7 @@ class Compute:
                         images.append(local_image)
         except OSError as e:
             raise ComputeError("Can't list images: {}".format(str(e)))
-        images.sort()
+        images = sorted(images, key=itemgetter('filename'))
         return images
 
     @asyncio.coroutine

tests/controller/test_compute.py

@@ -360,8 +360,10 @@ def test_images(compute, async_run, images_dir):
         images = async_run(compute.images("qemu"))
         mock.assert_called_with("GET", "https://example.com:84/v2/compute/qemu/images", auth=None, data=None, headers={'content-type': 'application/json'}, chunked=False, timeout=None)
 
-    assert images == [{"filename": "linux.qcow2", "path": "linux.qcow2", "md5sum": "d41d8cd98f00b204e9800998ecf8427e", "filesize": 0},
-                      {"filename": "asa.qcow2", "path": "asa.qcow2", "md5sum": "d41d8cd98f00b204e9800998ecf8427e", "filesize": 0}]
+    assert images == [
+        {"filename": "asa.qcow2", "path": "asa.qcow2", "md5sum": "d41d8cd98f00b204e9800998ecf8427e", "filesize": 0},
+        {"filename": "linux.qcow2", "path": "linux.qcow2", "md5sum": "d41d8cd98f00b204e9800998ecf8427e", "filesize": 0}
+    ]
 
 
 def test_list_files(project, async_run, compute):