fix spec

Author: aitchiss

src/lib/get-settings/get-settings.test.js

@@ -1,8 +1,10 @@
 import getSettings from './index.js';
 
 describe('replacements', () => {
-  it('should return nothing with no settings set', () => {
-    expect(getSettings()).toEqual(undefined);
+  it('should return the default config with no settings set', () => {
+    const derivedSettings = getSettings();
+    expect(derivedSettings.extends).toEqual('lighthouse:default');
+    expect(derivedSettings.settings).toEqual({});
   });
 
   it('should return a template config with preset set to desktop', () => {