feat: move plugin tests to separate file

test/plugins-installed.js

@@ -0,0 +1,21 @@
+'use strict';
+
+const path = require('path');
+const fs = require('fs');
+const db = require('./mocks/databasemock');
+
+const installedPlugins = fs.readdirSync(path.join(__dirname, '../node_modules'))
+	.filter(p => p.startsWith('nodebb-'));
+
+describe('Installed Plugins', function () {
+	installedPlugins.forEach((plugin) => {
+		const pathToTests = path.join(__dirname, '../node_modules', plugin, 'test');
+		try {
+			require(pathToTests);
+		} catch (err) {
+			if (err.code !== 'MODULE_NOT_FOUND') {
+				console.log(err.stack);
+			}
+		}
+	});
+});