Add simple performance benchmark based on @ai's suggestion

Usage: ``` time env BROWSERSLIST_DISABLE_CACHE=1 node test/perf-benchmark.js time env BROWSERSLIST_DISABLE_CACHE= node test/perf-benchmark.js ```
browserslist · Feb 13, 2017 · b9117a3 · b9117a3
1 parent 1450e26
commit b9117a3
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diff --git a/test/perf-benchmark.js b/test/perf-benchmark.js
@@ -0,0 +1,11 @@
+var browserslist = require('..');
+
+[
+    { file: './perf/one/app/css/hello.css', n: 3000 },
+    { file: './perf/two/app/js/hello.js', n: 3000 },
+    { file: './perf/three/app/js/hello.js', n: 3000 }
+].forEach(function (test) {
+    for (var i = 0; i < test.n; i++) {
+        browserslist.findConfig(test.file);
+    }
+});
diff --git a/test/perf/one/app/css/hello.css b/test/perf/one/app/css/hello.css
diff --git a/test/perf/one/package.json b/test/perf/one/package.json
@@ -0,0 +1,7 @@
+{
+  "private": true,
+  "browserslist": [
+    "ie 9",
+    "ie 10"
+  ]
+}
diff --git a/test/perf/three/app/js/hello.js b/test/perf/three/app/js/hello.js
@@ -0,0 +1 @@
+// three
diff --git a/test/perf/two/app/js/hello.js b/test/perf/two/app/js/hello.js
diff --git a/test/perf/two/browserslist b/test/perf/two/browserslist
@@ -0,0 +1 @@
+ie 11