bg spec

package.json

@@ -46,6 +46,7 @@
     "url": "https://github.com/lukeapage/pngjs2/issues"
   },
   "devDependencies": {
+    "buffer-equal": "0.0.1",
     "connect": "^3.4.0",
     "coveralls": "^2.11.3",
     "eslint": "^1.0.0",

test/.gitignore

@@ -0,0 +1 @@
+bg.png

test/bg-spec.js

@@ -0,0 +1,39 @@
+#!/usr/bin/env node
+
+var fs = require('fs');
+var PNG = require('../lib/png').PNG;
+var test = require('tape');
+var bufferEqual = require('buffer-equal');
+
+test('outputs background, created from scratch', function (t) {
+  var png = new PNG({
+    width: 10,
+    height: 10,
+    filterType: -1
+  });
+
+
+  for (var y = 0; y < png.height; y++) {
+    for (var x = 0; x < png.width; x++) {
+      var idx = (png.width * y + x) << 2;
+
+      var col = x < (png.width >> 1) ^ y < (png.height >> 1) ? 0xe5 : 0xff;
+
+      png.data[idx] = col;
+      png.data[idx + 1] = col;
+      png.data[idx + 2] = col;
+      png.data[idx + 3] = 0xff;
+    }
+  }
+
+  png.pack().pipe(fs.createWriteStream(__dirname + '/bg.png'))
+    .on("finish", function () {
+
+      var out = fs.readFileSync(__dirname + '/bg.png');
+      var ref = fs.readFileSync(__dirname + '/bg-ref.png');
+
+      t.ok(bufferEqual(out, ref), "compares with working file ok");
+
+      t.end();
+    });
+});

test/bg.js

@@ -1,27 +0,0 @@
-#!/usr/bin/env node
-
-var fs = require('fs'),
-  PNG = require('pngjs').PNG;
-
-
-var png = new PNG({
-  width: 10,
-  height: 10,
-  filterType: -1
-});
-
-
-for (var y = 0; y < png.height; y++) {
-  for (var x = 0; x < png.width; x++) {
-    var idx = (png.width * y + x) << 2;
-
-    var col = x < (png.width >> 1) ^ y < (png.height >> 1) ? 0xe5 : 0xff;
-
-    png.data[idx] = col;
-    png.data[idx + 1] = col;
-    png.data[idx + 2] = col;
-    png.data[idx + 3] = 0xff;
-  }
-}
-
-png.pack().pipe(fs.createWriteStream(__dirname + '/bg.png'));

test/run-compare.js

@@ -13,7 +13,7 @@ try {
   console.log("Comparing in PhantomJS");
 
   childProcess.execFile(binPath, childArgs, function (err, stdout, stderr) {
-    
+
     // handle results
     console.log("Comparison Test Results:");
     console.log(stdout);