Put npm-prefix in test dir bin

Author: lukekarrys

test/bin/windows-shims.js

@@ -6,19 +6,19 @@ const Diff = require('diff')
 const { sync: which } = require('which')
 const { version } = require('../../package.json')
 
-const readShimFiles = (dir) => readdirSync(dir).reduce((acc, shim) => {
+const readNonJsFiles = (dir) => readdirSync(dir).reduce((acc, shim) => {
   const p = join(dir, shim)
-  if (!p.endsWith('-cli.js') && !statSync(p).isDirectory()) {
+  if (extname(p) !== '.js' && !statSync(p).isDirectory()) {
     acc[shim] = readFileSync(p, 'utf-8')
   }
   return acc
 }, {})
 
 const ROOT = resolve(__dirname, '../..')
 const BIN = join(ROOT, 'bin')
-const SHIMS = readShimFiles(BIN)
-const NODE_GYP = readShimFiles(join(BIN, 'node-gyp-bin'))
-const SHIM_EXTS = [...new Set(Object.keys(SHIMS).map(p => extname(p)).filter(p => p !== '.js'))]
+const SHIMS = readNonJsFiles(BIN)
+const NODE_GYP = readNonJsFiles(join(BIN, 'node-gyp-bin'))
+const SHIM_EXTS = [...new Set(Object.keys(SHIMS).map(p => extname(p)))]
 
 // windows requires each segment of a command path to be quoted when using shell: true
 const quotePath = (cmd) => cmd
@@ -94,6 +94,7 @@ t.test('run shims', t => {
     node_modules: {
       npm: {
         bin: {
+          'npm-prefix.js': readFileSync(join(BIN, 'npm-prefix.js')),
           'npx-cli.js': `throw new Error('this should not be called')`,
           'npm-cli.js': `
             const assert = require('assert')