tests: fix config resolve to not query actual npm

test/_fixtures/config/file-with-repo-presets.js

@@ -15,7 +15,7 @@ module.exports = {
     },
     {
       repository: 'rennovateapp/github-app-cli',
-      extends: [':base', ':prHourlyLimit2']
+      extends: [':prHourlyLimit2']
     }
   ],
 };

test/config/index.spec.js

 const argv = require('../_fixtures/config/argv');
 const defaultConfig = require('../../lib/config/defaults').getConfig();
+const npm = require('../../lib/datasource/npm');
+const presetDefaults = require('../_fixtures/npm/renovate-config-default');
+
+npm.getDependency = jest.fn(() => ({
+  'renovate-config':
+    presetDefaults.versions[presetDefaults['dist-tags'].latest][
+      'renovate-config'
+    ],
+}));
 
 describe('config/index', () => {
   describe('.parseConfigs(env, defaultArgv)', () => {