リソースが取得できるかどうかのテストなど (#7316)

* Tests for Fetch resource

* Remove unnecessary copy

* Update koa-views, pug

package.json

@@ -174,7 +174,7 @@
 		"koa-mount": "4.0.0",
 		"koa-send": "5.0.1",
 		"koa-slow": "2.1.0",
-		"koa-views": "6.3.1",
+		"koa-views": "7.0.0",
 		"langmap": "0.0.16",
 		"lookup-dns-cache": "2.1.0",
 		"markdown-it": "12.0.4",
@@ -200,7 +200,7 @@
 		"probe-image-size": "6.0.0",
 		"promise-limit": "2.7.0",
 		"promise-sequential": "1.1.1",
-		"pug": "2.0.4",
+		"pug": "3.0.2",
 		"punycode": "2.1.1",
 		"pureimage": "0.2.5",
 		"qrcode": "1.4.4",