fix(nyaa): nyaa test fix

src/background/strategies/nyaa.js

@@ -1,4 +1,3 @@
-
 const fetch = require('node-fetch')
 const cheerio = require('cheerio')
 
@@ -14,24 +13,32 @@ module.exports = class Nyaa
 
 	async parse()
 	{
-		let html;
-		try {
-			html = await fetch('https://nyaa.si/' + (this.threadId ? `view/${this.threadId}` : (this.hash ? `?q=${this.hash}` : '')))
-		} catch(err) {
-			return
-		}
-		if(!html)
-			return
-		html = await html.textConverted()
-		const $ = cheerio.load(html)
-		let topicTitle = $('.panel-title').first().text()
-		if(!topicTitle)
-			return
+		if(this.promise)
+			await this.promise
 
-		topicTitle = topicTitle.replace(/\t/g, '').replace(/\n/g, '')
-		return {
-			name: topicTitle,
-			description: $('#torrent-description').text(),
-		}
+		this.promise = new Promise(async (resolve) => {
+			let html;
+			try {
+				html = await fetch('https://nyaa.si/' + (this.threadId ? `view/${this.threadId}` : (this.hash ? `?q=${this.hash}` : '')))
+			} catch(err) {
+				resolve()
+			}
+			if(!html)
+				resolve()
+			html = await html.textConverted()
+			const $ = cheerio.load(html)
+			let topicTitle = $('.panel-title').first().text()
+			if(!topicTitle)
+				resolve()
+
+			topicTitle = topicTitle.replace(/\t/g, '').replace(/\n/g, '')
+
+			resolve({
+				name: topicTitle,
+				description: $('#torrent-description').text(),
+			})
+		})
+
+		return await this.promise
 	}
 }