npmlog.notice the registry when using 'npm login'

PR-URL: #2075
Credit: @Wicked7000
Close: #2075
Reviewed-by: @isaacs

Fixes: #2071

lib/adduser.js

@@ -4,6 +4,7 @@ const log = require('npmlog')
 const npm = require('./npm.js')
 const output = require('./utils/output.js')
 const usageUtil = require('./utils/usage.js')
+const replaceInfo = require('./utils/replace-info.js')
 const authTypes = {
   legacy: require('./auth/legacy.js'),
   oauth: require('./auth/oauth.js'),
@@ -57,6 +58,8 @@ const adduser = async (args) => {
 
   log.disableProgress()
 
+  log.notice('', `Log in on ${replaceInfo(registry)}`)
+
   const { message, newCreds } = await auth({
     creds,
     registry,

test/lib/adduser.js

@@ -13,6 +13,7 @@ const _flatOptions = {
 
 let failSave = false
 let deletedConfig = {}
+let registryOutput = ''
 let setConfig = {}
 const authDummy = () => Promise.resolve({
   message: 'success',
@@ -32,7 +33,10 @@ const deleteMock = (key, where) => {
 }
 const adduser = requireInject('../../lib/adduser.js', {
   npmlog: {
-    disableProgress: () => null
+    disableProgress: () => null,
+    notice: (_, msg) => {
+      registryOutput = msg
+    },
   },
   '../../lib/npm.js': {
     flatOptions: _flatOptions,
@@ -69,6 +73,12 @@ test('simple login', (t) => {
   adduser([], (err) => {
     t.ifError(err, 'npm adduser')
 
+    t.equal(
+      registryOutput,
+      'Log in on https://registry.npmjs.org/',
+      'should have correct message result'
+    )
+
     t.deepEqual(
       deletedConfig,
       {
@@ -102,6 +112,7 @@ test('simple login', (t) => {
       'should output auth success msg'
     )
 
+    registryOutput = ''
     deletedConfig = {}
     setConfig = {}
     result = ''