Fix flaky test_json_export()

[jacobtylerwalls]

Types of changes

• [x] Bugfix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)

Description of Change

In this test we had indeterminate sorting of lists holding dictionaries. To sort a list of dictionaries consistently, we need to define a sort key. We had a sort key for the innermost array of tiles (tileid), but not the outer array of resources.

Testing instructions

With this diff applied:

diff --git a/tests/exporter/resource_export_tests.py b/tests/exporter/resource_export_tests.py
index 764829e9f5..51799cab88 100644
--- a/tests/exporter/resource_export_tests.py
+++ b/tests/exporter/resource_export_tests.py
@@ -95,6 +95,7 @@ class BusinessDataExportTests(ArchesTestCase):
         self.assertDictEqual(dict(csv_input), dict(csv_output))

     def test_json_export(self):
+        import random
         def deep_sort(obj):
             """
             Recursively sort list or dict nested lists. Taken from
@@ -117,6 +118,7 @@ class BusinessDataExportTests(ArchesTestCase):
                     _sorted = sorted(
                         new_list,
                         key=lambda item: item["resourceinstance"]["resourceinstanceid"],
+                        reverse=random.random() > 0.5,
                     )
                 else:
                     try:

you can run python3 manage.py test tests -k test_json_export --settings=tests.test_settings --keepdb and see the failure occasionally seen on CI.