add concurrency test

test/js/concurrency.test.js

@@ -0,0 +1,74 @@
+'use strict';
+
+/* jshint node:true */
+
+var test = require('tape');
+var mbgl = require('../..');
+var fs = require('fs');
+var path = require('path');
+
+var suitePath = path.dirname(require.resolve('mapbox-gl-test-suite/package.json'));
+
+
+function renderTest(style, info, dir, key) {
+    return function (t) {
+        var completed = 0;
+        var remaining = 10;
+        var start = +new Date;
+
+        var fileSource = new mbgl.FileSource();
+        fileSource.request = function(req) {
+            fs.readFile(path.join(suitePath, decodeURIComponent(req.url)), function(err, data) {
+                req.respond(err, { data: data });
+                t.error(err);
+            });
+        };
+        fileSource.cancel = function() {};
+
+        var map = new mbgl.Map(fileSource);
+        map.load(style);
+
+        for (var i = 0; i < remaining; i++) {
+            map.render(info[key], function(err, image) {
+                t.error(err);
+                t.ok(true, 'render @ ' + ((+new Date) - start) + 'ms');
+                if (++completed === remaining) t.end();
+            });
+        }
+    };
+}
+
+function rewriteLocalSchema(uri) {
+    return uri.replace(/^local:\/\//, '');
+}
+
+test('Concurrency', function(t) {
+    var dir = 'line-join';
+    var k = 'round';
+
+    var style = require(path.join(suitePath, 'tests', dir, 'style.json')),
+        info  = require(path.join(suitePath, 'tests', dir, 'info.json'));
+
+    for (var k in style.sources) {
+        var source = style.sources[k];
+
+        if (source.tiles) {
+            source.tiles = source.tiles.map(rewriteLocalSchema);
+        }
+
+        if (source.url) {
+            source.url = rewriteLocalSchema(source.url);
+        }
+    }
+
+    if (style.sprite) style.sprite = rewriteLocalSchema(style.sprite);
+    if (style.glyphs) style.glyphs = rewriteLocalSchema(style.glyphs);
+
+    style = JSON.stringify(style);
+
+    for (k in info) {
+        t.test(dir + ' ' + k, renderTest(style, info, dir, k));
+    }
+
+    t.end();
+});