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diff --git a/‎src/traces/bar/attributes.js
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+16-8Lines changed: 16 additions & 8 deletions b/‎src/traces/bar/attributes.js
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+16-8Lines changed: 16 additions & 8 deletions
diff --git a/‎src/traces/histogram/attributes.js
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+1-13Lines changed: 1 addition & 13 deletions b/‎src/traces/histogram/attributes.js
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+1-13Lines changed: 1 addition & 13 deletions
diff --git a/‎test/image/baselines/bar_bargap0.png
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16.2 KB b/‎test/image/baselines/bar_bargap0.png
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diff --git a/‎test/image/compare_pixels_test.js
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+23-5Lines changed: 23 additions & 5 deletions b/‎test/image/compare_pixels_test.js
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+23-5Lines changed: 23 additions & 5 deletions
diff --git a/‎test/image/mocks/bar_bargap0.json
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+40Lines changed: 40 additions & 0 deletions b/‎test/image/mocks/bar_bargap0.json
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+40Lines changed: 40 additions & 0 deletions
@@ -15,6 +15,19 @@ var extendFlat = require('../../lib/extend').extendFlat;
 var scatterMarkerAttrs = scatterAttrs.marker;
 var scatterMarkerLineAttrs = scatterMarkerAttrs.line;
 
+var markerLineWidth = extendFlat({},
+    scatterMarkerLineAttrs.width, { dflt: 0 });
+
+var markerLine = extendFlat({}, {
+    width: markerLineWidth
+}, colorAttributes('marker.line'));
+
+var marker = extendFlat({}, {
+    showscale: scatterMarkerAttrs.showscale,
+    line: markerLine
+}, colorAttributes('marker'));
+
+
 module.exports = {
     x: scatterAttrs.x,
     x0: scatterAttrs.x0,
@@ -23,6 +36,7 @@ module.exports = {
     y0: scatterAttrs.y0,
     dy: scatterAttrs.dy,
     text: scatterAttrs.text,
+
     orientation: {
         valType: 'enumerated',
         role: 'info',
@@ -33,14 +47,8 @@ module.exports = {
             'along the vertical (horizontal).'
         ].join(' ')
     },
-    marker: extendFlat({}, {
-        showscale: scatterMarkerAttrs.showscale,
-        line: extendFlat({},
-            {width: scatterMarkerLineAttrs.width},
-            colorAttributes('marker.line')
-        )},
-        colorAttributes('marker')
-    ),
+
+    marker: marker,
 
     r: scatterAttrs.r,
     t: scatterAttrs.t,
 
@@ -9,12 +9,7 @@
 'use strict';
 
 var barAttrs = require('../bar/attributes');
-var colorAttributes = require('../../components/colorscale/color_attributes');
 
-var extendFlat = require('../../lib/extend').extendDeep;
-
-var barMarkerAttrs = barAttrs.marker;
-var barMarkerLineAttrs = barMarkerAttrs.line;
 
 module.exports = {
     x: {
@@ -124,14 +119,7 @@ module.exports = {
     },
     ybins: makeBinsAttr('y'),
 
-    marker: extendFlat({}, {
-        showscale: barMarkerAttrs.showscale,
-        line: extendFlat({},
-            {width: extendFlat({}, barMarkerLineAttrs.width, {dflt: 0})},
-            colorAttributes('marker.line'))
-    },
-        colorAttributes('marker')
-    ),
+    marker: barAttrs.marker,
 
     _nestedModules: {
         'error_y': 'ErrorBars',
 
@@ -147,11 +147,12 @@ function comparePixels(mockName, cb) {
         saveImageStream = fs.createWriteStream(imagePaths.test);
 
     function checkImage() {
-        var gmOpts = {
-            file: imagePaths.diff,
-            highlightColor: 'purple',
-            tolerance: TOLERANCE
-        };
+
+        // baseline image must be generated first
+        if(!doesFileExist(imagePaths.baseline)) {
+            var err = new Error('baseline image not found');
+            return onEqualityCheck(err, false);
+        }
 
         /*
          * N.B. The non-zero tolerance was added in
@@ -169,6 +170,12 @@ function comparePixels(mockName, cb) {
          * Further investigation is needed.
          */
 
+        var gmOpts = {
+            file: imagePaths.diff,
+            highlightColor: 'purple',
+            tolerance: TOLERANCE
+        };
+
         gm.compare(
             imagePaths.test,
             imagePaths.baseline,
@@ -194,6 +201,17 @@ function comparePixels(mockName, cb) {
         .on('close', checkImage);
 }
 
+function doesFileExist(filePath) {
+    try {
+        if(fs.statSync(filePath).isFile()) return true;
+    }
+    catch(e) {
+        return false;
+    }
+
+    return false;
+}
+
 function touch(filePath) {
     fs.closeSync(fs.openSync(filePath, 'w'));
 }
@@ -0,0 +1,40 @@
+{
+  "data": [
+    {
+      "x": [
+        "giraffes",
+        "orangutans",
+        "monkeys"
+      ],
+      "y": [
+        20,
+        14,
+        23
+      ],
+      "name": "SF Zoo",
+      "type": "bar"
+    }
+  ],
+  "layout": {
+    "bargap": 0,
+    "xaxis": {
+      "type": "category",
+      "range": [
+        -0.5,
+        2.5
+      ],
+      "autorange": true
+    },
+    "yaxis": {
+      "type": "linear",
+      "range": [
+        0,
+        24.210526315789473
+      ],
+      "autorange": true
+    },
+    "height": 450,
+    "width": 1100,
+    "autosize": false
+  }
+}