WIP - add extractor, generate snippet_data

node_modules/pixelmatch/test/test.js

@@ -0,0 +1,47 @@
+'use strict';
+
+var PNG = require('pngjs').PNG,
+    fs = require('fs'),
+    test = require('tap').test,
+    path = require('path'),
+    match = require('../.');
+
+diffTest('1a', '1b', '1diff', 0.05, false, 143);
+diffTest('2a', '2b', '2diff', 0.05, false, 12439);
+diffTest('3a', '3b', '3diff', 0.05, false, 212);
+diffTest('4a', '4b', '4diff', 0.05, false, 36089);
+
+function diffTest(imgPath1, imgPath2, diffPath, threshold, includeAA, expectedMismatch) {
+    var name = 'comparing ' + imgPath1 + ' to ' + imgPath2 +
+            ', threshold: ' + threshold + ', includeAA: ' + includeAA;
+
+    test(name, function (t) {
+        var img1 = readImage(imgPath1, function () {
+            var img2 = readImage(imgPath2, function () {
+                var expectedDiff = readImage(diffPath, function () {
+                    var diff = new PNG({width: img1.width, height: img1.height});
+
+                    var mismatch = match(img1.data, img2.data, diff.data, diff.width, diff.height, {
+                        threshold: threshold,
+                        includeAA: includeAA
+                    });
+
+                    var mismatch2 = match(img1.data, img2.data, null, diff.width, diff.height, {
+                        threshold: threshold,
+                        includeAA: includeAA
+                    });
+
+                    t.same(diff.data, expectedDiff.data, 'diff image');
+                    t.same(mismatch, expectedMismatch, 'number of mismatched pixels');
+                    t.same(mismatch, mismatch2, 'number of mismatched pixels');
+
+                    t.end();
+                });
+            });
+        });
+    });
+}
+
+function readImage(name, done) {
+    return fs.createReadStream(path.join(__dirname, '/fixtures/' + name + '.png')).pipe(new PNG()).on('parsed', done);
+}