tests: add option to update tables during tests (#38067)

If table contents change, we can measure the change and eventually
accept by copying new_table.json to tables.json. To activate it, use
--bijoe-store-table .

tests/conftest.py

@@ -18,6 +18,12 @@ from django.contrib.auth.models import User
 from django.core.management import call_command
 
 
+def pytest_addoption(parser):
+    parser.addoption(
+        '--bijoe-store-table', action='store_true', default=False, help='Store tables value in new_tables.json',
+    )
+
+
 @pytest.fixture
 def app(settings, request):
     settings.TEMPLATE_DEBUG = True

tests/test_schema2.py

@@ -35,13 +35,24 @@ def freezetime(freezer):
     freezer.move_to('2018-12-07 16:53:00')
 
 
-def test_simple(schema2, app, admin, visualization):
+def test_simple(request, schema2, app, admin, visualization):
     login(app, admin)
     response = app.get('/')
 
     visualization_page = response.click(lambda x: x == visualization)
     assert 'big-msg-info' not in visualization_page
     table = get_table(visualization_page)
+    if request.config.getoption('--bijoe-store-table'):
+        d = {}
+        new_table_path = 'tests/fixtures/schema2/new_tables.json'
+        if os.path.exists(new_table_path):
+            with open(new_table_path) as fd:
+                d = json.load(fd)
+            if 'tables' in d:
+                d = d['tables']
+        d[visualization] = table
+        with open(new_table_path, 'w') as fd:
+            json.dump(d, fd, indent=4, sort_keys=True, separators=(',', ': '))
     assert_equal_tables(
         schema2['tables'][visualization],
         table)