fixup! test: add lib/update.js tests

test/lib/update.js

@@ -121,27 +121,30 @@ t.test('update --depth=<number>', t => {
 })
 
 t.test('update --global', t => {
-  t.plan(1)
+  t.plan(2)
 
   const normalizePath = p => p.replace(/\\+/g, '/')
   const redactCwd = (path) => normalizePath(path)
     .replace(new RegExp(normalizePath(process.cwd()), 'g'), '{CWD}')
 
   npm.prefix = '/project/a'
-  npm.globalDir = resolve(process.cwd(), '/global/lib/node_modules')
+  npm.globalDir = resolve(process.cwd(), 'global/lib/node_modules')
   npm.flatOptions.global = true
 
   class Arborist {
     constructor (args) {
       const { path, ...opts } = args
       t.deepEqual(
-        {
-          ...opts,
-          path: redactCwd(path),
-        },
-        { ...npm.flatOptions, path: '/global/lib' },
+        opts,
+        npm.flatOptions,
         'should call arborist contructor with expected options'
       )
+
+      t.equal(
+        redactCwd(path),
+        '{CWD}/global/lib',
+        'should run with expected prefix'
+      )
     }
 
     reify () {}