plotly#189 adding image based tests

Author: monfera

test/image/baselines/axes_category_ascending.png

@@ -1,46 +1,13 @@
 {
-    "data": [
-        {
-            "x": [
-                5,
-                1,
-                null,
-                2,
-                4
-            ],
-            "y": [
-                1,
-                2,
-                3,
-                4,
-                5
-            ],
-            "connectgaps": false,
-            "uid": "8ac13a"
-        }
+    "data": [{
+        "x": ["c","a","e","b","d"],
+        "y": [15,11,12,13,14]}
     ],
     "layout": {
-        "title": "category ascending",
         "xaxis": {
+            "title": "category ascending",
             "type": "category",
-            "range": [
-                -0.18336673346693386,
-                3.1833667334669338
-            ],
-            "autorange": true,
             "categorymode": "category ascending",
-            "categorylist": [2,4,5,1]
-        },
-        "yaxis": {
-            "type": "linear",
-            "range": [
-                0.7070063694267517,
-                5.292993630573249
-            ],
-            "autorange": true
-        },
-        "height": 450,
-        "width": 1000,
-        "autosize": true
-    }
+            "categorylist": ["y","b","x","a","d","z","e","c", "q", "k"]
+        }}
 }

test/image/baselines/axes_category_categorylist.png

@@ -0,0 +1,13 @@
+{
+    "data": [{
+        "x": ["c","a","e","b","d"],
+        "y": [15,11,12,13,14]}
+    ],
+    "layout": {
+        "title": "categorylist with truncated tails (y, q, k not plotted)",
+        "xaxis": {
+            "type": "category",
+            "categorymode": "array",
+            "categorylist": ["y","b","x","a","d","z","e","c", "q", "k"]
+        }}
+}

test/image/baselines/axes_category_categorylist_truncated_tails.png

@@ -4,7 +4,7 @@
             "x": [
                 5,
                 1,
-                null,
+                3,
                 2,
                 4
             ],
@@ -23,11 +23,6 @@
         "title": "category descending",
         "xaxis": {
             "type": "category",
-            "range": [
-                -0.18336673346693386,
-                3.1833667334669338
-            ],
-            "autorange": true,
             "categorymode": "category descending",
             "categorylist": [2,4,5,1]
         },

test/image/baselines/axes_category_descending.png

@@ -0,0 +1,41 @@
+{
+    "data": [
+        {
+            "x": [
+                5,
+                null,
+                3,
+                2,
+                4
+            ],
+            "y": [
+                1,
+                2,
+                3,
+                null,
+                5
+            ],
+            "connectgaps": false,
+            "uid": "8ac13a"
+        }
+    ],
+    "layout": {
+        "title": "category descending",
+        "xaxis": {
+            "type": "category",
+            "categorymode": "category descending",
+            "categorylist": [2,4,5,1]
+        },
+        "yaxis": {
+            "type": "linear",
+            "range": [
+                0.7070063694267517,
+                5.292993630573249
+            ],
+            "autorange": true
+        },
+        "height": 450,
+        "width": 1000,
+        "autosize": true
+    }
+}