add test to lock issue 5267

Author: archmoj

test/image/baselines/missing-category-order.png

@@ -0,0 +1,41 @@
+{
+    "data": [
+        {
+            "type": "histogram",
+            "x": [
+                "A",
+                "A",
+                "B"
+            ]
+        },
+        {
+            "type": "histogram",
+            "x": [
+                "A",
+                "A",
+                "C"
+            ]
+        },
+        {
+            "type": "histogram",
+            "x": [
+                "B",
+                "B"
+            ]
+        }
+    ],
+    "layout": {
+        "barmode": "stack",
+        "xaxis": {
+            "categoryorder": "total descending"
+        },
+        "width": 300,
+        "height": 200,
+        "margin": {
+            "t": 40,
+            "b": 20,
+            "l": 20,
+            "r": 20
+        }
+    }
+}

test/image/mocks/missing-category-order.json

@@ -737,6 +737,7 @@ var list = [
     'matching-missing-axes',
     'mathjax',
     'mirror-all-vs-allticks',
+    'missing-category-order',
     'multicategory',
     'multicategory_histograms',
     'multicategory-inside-ticks',
@@ -1809,6 +1810,7 @@ figs['matching-categories'] = require('@mocks/matching-categories');
 // figs['matching-missing-axes'] = require('@mocks/matching-missing-axes');
 // figs['mathjax'] = require('@mocks/mathjax');
 figs['mirror-all-vs-allticks'] = require('@mocks/mirror-all-vs-allticks');
+figs['missing-category-order'] = require('@mocks/missing-category-order');
 figs['multicategory'] = require('@mocks/multicategory');
 figs['multicategory_histograms'] = require('@mocks/multicategory_histograms');
 figs['multicategory-inside-ticks'] = require('@mocks/multicategory-inside-ticks');