add a test for the case of large horizontal margin

Author: archmoj

test/image/baselines/automargin-large-margins-horizontal.png

@@ -0,0 +1,55 @@
+{
+    "data": [{
+            "name": "< D E A T H >",
+            "marker": { "color": "red" },
+            "y": [
+                "Antonio Vivaldi",
+                "Johann Sebastian Bach",
+                "Wolfgang Amadeus Mozart",
+                "Ludwig van Beethoven"
+            ],
+            "x": [
+                "1741",
+                "1750",
+                "1791",
+                "1827"
+            ]
+    },
+    {
+        "name": "< B I R T H >",
+        "marker": { "color": "blue" },
+        "y": [
+            "Antonio Vivaldi",
+            "Johann Sebastian Bach",
+            "Wolfgang Amadeus Mozart",
+            "Ludwig van Beethoven"
+        ],
+        "x": [
+            "1678",
+            "1685",
+            "1756",
+            "1770"
+        ]
+    }],
+    "layout": {
+        "showlegend": false,
+        "title": {
+            "text": "Longest and shortest<br>names and time periods"
+        },
+        "width": 240,
+        "height": 200,
+        "margin": {
+            "t": 80,
+            "b": 20,
+            "l": 20,
+            "r": 20
+        },
+        "xaxis": {
+            "type": "date",
+            "automargin": true
+        },
+        "yaxis": {
+            "automargin": true
+        }
+    }
+}

test/image/baselines/automargin-large-margins.png

@@ -33,7 +33,7 @@
     }],
     "layout": {
         "title": {
-            "text": "Longest and shortest<br>names and time period"
+            "text": "Longest and shortest<br>names and time periods"
         },
         "width": 240,
         "height": 300,

test/image/mocks/automargin-large-margins-horizontal.json

@@ -40,6 +40,7 @@ var list = [
     'annotations-autorange',
     'arrow-markers',
     'automargin-large-margins',
+    'automargin-large-margins-horizontal',
     'automargin-mirror-all',
     'automargin-mirror-allticks',
     'automargin-multiline-titles',
@@ -1105,6 +1106,7 @@ figs['animation_bar'] = require('@mocks/animation_bar');
 // figs['annotations-autorange'] = require('@mocks/annotations-autorange');
 figs['arrow-markers'] = require('@mocks/arrow-markers');
 figs['automargin-large-margins'] = require('@mocks/automargin-large-margins');
+figs['automargin-large-margins-horizontal'] = require('@mocks/automargin-large-margins-horizontal');
 figs['automargin-mirror-all'] = require('@mocks/automargin-mirror-all');
 figs['automargin-mirror-allticks'] = require('@mocks/automargin-mirror-allticks');
 figs['automargin-multiline-titles'] = require('@mocks/automargin-multiline-titles');