use before_test and after_test

test/runtime/samples/empty-component-destroy/_config.js

@@ -1,19 +1,25 @@
+let log;
 export default {
 	html: `
 	  <button>destroy component</button>
 	`,
 
+	before_test() {
+		log = console.log;
+	},
+	after_test() {
+		console.log = log;
+	},
+
 	async test({ assert, target, window }) {
 		const button = target.querySelector('button');
 		const event = new window.MouseEvent('click');
 		const messages = [];
-		const log = console.log;
 		console.log = msg => messages.push(msg);
 		await button.dispatchEvent(event);
 		assert.htmlEqual(target.innerHTML, `
 			<button>destroy component</button>
 		`);
 		assert.deepEqual(messages, ['destroy']);
-		console.log = log;
 	}
 };