Setup integration snapshot test

.gitignore

@@ -1 +1,4 @@
 *.pyc
+actual.png
+diff.png
+/node_modules/

integration_tests.js

@@ -0,0 +1,16 @@
+var fs = require('fs'),
+    PNG = require('pngjs').PNG,
+    pixelmatch = require('pixelmatch');
+
+var img1 = fs.createReadStream('expected.png').pipe(new PNG()).on('parsed', doneReading),
+    img2 = fs.createReadStream('actual.png').pipe(new PNG()).on('parsed', doneReading),
+    filesRead = 0;
+
+function doneReading() {
+    if (++filesRead < 2) return;
+    var diff = new PNG({width: img1.width, height: img1.height});
+
+    pixelmatch(img1.data, img2.data, diff.data, img1.width, img1.height, {threshold: 0.1});
+
+    diff.pack().pipe(fs.createWriteStream('diff.png'));
+}

integration_tests.py

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+import dash
+
+def main():
+    dash.Dash().render().save('actual.png')
+
+if __name__ == '__main__':
+    main()

package.json

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+{
+  "name": "e-ink-dash",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "python dash_tests.py && python integration_tests.py && node integration_tests.js && open diff.png"
+  },
+  "author": "",
+  "license": "ISC",
+  "devDependencies": {
+    "pixelmatch": "^4.0.2"
+  }
+}