Add basic updates test

src/plugins/default/__tests__/updates.js

@@ -0,0 +1,10 @@
+import { describe, it } from 'mocha';
+import { checkPackageUpdates } from '../../../updates';
+import { expect } from 'chai';
+
+describe.only('package updates', () => {
+  it('should detect update', async () => {
+    const result = await checkPackageUpdates('mup', {version: '1.0.0'});
+    expect(result).to.equal(true);
+  });
+});

src/updates.js

@@ -74,7 +74,7 @@ function showUpdateOnExit(pkg, version, isStable) {
   });
 }
 
-function checkPackageUpdates(name, pkg) {
+export function checkPackageUpdates(name, pkg) {
   log(`retrieving tags for ${name}`);
 
   return axios.get(`https://registry.npmjs.org/-/package/${name}/dist-tags`)
@@ -95,6 +95,8 @@ function checkPackageUpdates(name, pkg) {
       if (available) {
         showUpdateOnExit(pkg, isStable ? npmVersion : nextVersion, isStable);
       }
+
+      return Boolean(available);
     }).catch(e => {
       // It is okay if this fails
       log(e);