test: Add test for npm-usage.js, and fix 'npm --long' output

lib/access.js

@@ -8,7 +8,6 @@ const output = require('./utils/output.js')
 const otplease = require('./utils/otplease.js')
 const usageUtil = require('./utils/usage.js')
 const getIdentity = require('./utils/get-identity.js')
-const { prefix } = npm
 
 const usage = usageUtil(
   'npm access',
@@ -165,7 +164,7 @@ const getPackage = async (name, requireScope) => {
     return name.trim()
   else {
     try {
-      const pkg = await readPackageJson(path.resolve(prefix, 'package.json'))
+      const pkg = await readPackageJson(path.resolve(npm.prefix, 'package.json'))
       name = pkg.name
     } catch (err) {
       if (err.code === 'ENOENT') {

lib/utils/npm-usage.js

@@ -6,6 +6,8 @@ const { cmdList } = require('./cmd-list')
 
 module.exports = (valid = true) => {
   npm.config.set('loglevel', 'silent')
+  const usesBrowser = npm.config.get('viewer') === 'browser'
+  ? ' (in a browser)' : ''
   npm.log.level = 'silent'
   output(`
 Usage: npm <command>
@@ -16,8 +18,8 @@ npm test           run this project's tests
 npm run <foo>      run the script named <foo>
 npm <command> -h   quick help on <command>
 npm -l             display usage info for all commands
-npm help <term>    search for help on <term> (in a browser)
-npm help npm       more involved overview (in a browser)
+npm help <term>    search for help on <term>${usesBrowser}
+npm help npm       more involved overview${usesBrowser}
 
 All commands:
 ${npm.config.get('long') ? usages() : ('\n    ' + wrap(cmdList))}
@@ -40,44 +42,34 @@ npm@${npm.version} ${dirname(dirname(__dirname))}
 }
 
 const wrap = (arr) => {
-  var out = ['']
-  var l = 0
-  var line
+  const out = ['']
 
-  line = process.stdout.columns
-  if (!line)
-    line = 60
-  else
-    line = Math.min(60, Math.max(line - 16, 24))
+  const line = !process.stdout.columns ? 60
+  : Math.min(60, Math.max(process.stdout.columns - 16, 24))
 
-  arr.sort(function (a, b) {
-    return a < b ? -1 : 1
-  })
-    .forEach(function (c) {
-      if (out[l].length + c.length + 2 < line)
-        out[l] += ', ' + c
-      else {
-        out[l++] += ','
-        out[l] = c
-      }
-    })
+  let l = 0
+  for (const c of arr.sort((a, b) => a < b ? -1 : 1)) {
+    if (out[l].length + c.length + 2 < line)
+      out[l] += ', ' + c
+    else {
+      out[l++] += ','
+      out[l] = c
+    }
+  }
   return out.join('\n    ').substr(2)
 }
 
 const usages = () => {
   // return a string of <command>: <usage>
-  var maxLen = 0
-  return cmdList.reduce(function (set, c) {
-    set.push([c, require(`./${npm.deref(c)}.js`).usage || ''])
+  let maxLen = 0
+  return cmdList.reduce((set, c) => {
+    set.push([c, require(`../${npm.deref(c)}.js`).usage ||
+      /* istanbul ignore next - all commands should have usage */ ''])
     maxLen = Math.max(maxLen, c.length)
     return set
-  }, []).sort((a, b) => {
-    return a[0].localeCompare(b[0])
-  }).map(function (item) {
-    var c = item[0]
-    var usage = item[1]
-    return '\n    ' +
-      c + (new Array(maxLen - c.length + 2).join(' ')) +
-      (usage.split('\n').join('\n' + (new Array(maxLen + 6).join(' '))))
-  }).join('\n')
+  }, [])
+    .sort((a, b) => a[0].localeCompare(b[0]))
+    .map(([c, usage]) => `\n    ${c}${' '.repeat(maxLen - c.length + 1)}${
+      (usage.split('\n').join('\n' + ' '.repeat(maxLen + 5)))}`)
+    .join('\n')
 }