added tests for power assert not throwing on experimental syntax

package.json

@@ -150,6 +150,7 @@
     "update-notifier": "^0.7.0"
   },
   "devDependencies": {
+    "babel-preset-react": "^6.5.0",
     "cli-table2": "^0.2.0",
     "coveralls": "^2.11.4",
     "delay": "^1.3.0",

test/api.js

@@ -650,9 +650,13 @@ function generateTests(prefix, apiCreator) {
 	});
 
 	test(prefix + 'power-assert support', function (t) {
-		t.plan(3);
+		t.plan(5);
 
-		var api = apiCreator();
+		var api = apiCreator({
+			babelConfig: {
+				presets: ['react', 'es2015', 'stage-2']
+			}
+		});
 
 		api.run([path.join(__dirname, 'fixture/power-assert.js')])
 			.then(function (result) {
@@ -667,6 +671,16 @@ function generateTests(prefix, apiCreator) {
 					result.errors[1].error.message,
 					/with message\s+t\.true\(a === 'foo', 'with message'\)\s*\n\s+\|\s*\n\s+"bar"/m
 				);
+
+				t.match(
+					result.errors[2].error.message,
+					/t\.true\(o === \{ ...o \}\)\s*\n\s+\|\s*\n\s+Object\{\}/m
+				);
+
+				t.match(
+					result.errors[3].error.message,
+					/t\.true\(<div \/> === <span \/>\)/m
+				)
 			});
 	});
 

test/fixture/power-assert.js

@@ -11,3 +11,15 @@ test.serial(t => {
 
 	t.true(a === 'foo', 'with message');
 });
+
+test.serial(t => {
+	const o = {};
+
+	t.true(o === {...o});
+});
+
+test.serial(t => {
+	const React = { createElement: function(type) { return type } }
+
+	t.true(<div /> === <span />);
+});