[test] Add tests

.npmignore

@@ -1,4 +1,5 @@
 prebuilds/
 build/
 appveyor.yml
+test.js
 .*

package.json

@@ -5,7 +5,7 @@
   "main": "index.js",
   "scripts": {
     "install": "prebuild-install || node-gyp rebuild",
-    "test": "echo \"Only testing builds, tests have to be extraced from ws\" && prebuild-ci"
+    "test": "mocha && prebuild-ci"
   },
   "repository": {
     "type": "git",
@@ -26,6 +26,7 @@
     "prebuild-install": "~2.1.0"
   },
   "devDependencies": {
+    "mocha": "~3.2.0",
     "prebuild": "~6.1.0",
     "prebuild-ci": "~2.2.0"
   }

test.js

@@ -0,0 +1,47 @@
+'use strict';
+
+const assert = require('assert');
+
+function use(bufferUtil) {
+  return function () {
+    it('masks a buffer (1/2)', function () {
+      const buf = Buffer.from([0x6c, 0x3c, 0x58, 0xd9, 0x3e, 0x21, 0x09, 0x9f]);
+      const mask = Buffer.from([0x48, 0x2a, 0xce, 0x24]);
+
+      bufferUtil.mask(buf, mask, buf, 0, buf.length);
+
+      assert.deepStrictEqual(
+        buf,
+        Buffer.from([0x24, 0x16, 0x96, 0xfd, 0x76, 0x0b, 0xc7, 0xbb])
+      );
+    });
+
+    it('masks a buffer (2/2)', function () {
+      const src = Buffer.from([0x6c, 0x3c, 0x58, 0xd9, 0x3e, 0x21, 0x09, 0x9f]);
+      const mask = Buffer.from([0x48, 0x2a, 0xce, 0x24]);
+      const dest = Buffer.alloc(src.length + 2);
+
+      bufferUtil.mask(src, mask, dest, 2, src.length);
+
+      assert.deepStrictEqual(
+        dest,
+        Buffer.from([0x00, 0x00, 0x24, 0x16, 0x96, 0xfd, 0x76, 0x0b, 0xc7, 0xbb])
+      );
+    });
+
+    it('unmasks a buffer', function () {
+      const buf = Buffer.from([0x24, 0x16, 0x96, 0xfd, 0x76, 0x0b, 0xc7, 0xbb]);
+      const mask = Buffer.from([0x48, 0x2a, 0xce, 0x24]);
+
+      bufferUtil.unmask(buf, mask);
+
+      assert.deepStrictEqual(
+        buf,
+        Buffer.from([0x6c, 0x3c, 0x58, 0xd9, 0x3e, 0x21, 0x09, 0x9f])
+      );
+    });
+  };
+}
+
+describe('bindings', use(require('bindings')('bufferutil')));
+describe('fallback', use(require('./fallback')));