diff --git a/test/index.ts b/test/index.ts
index 62c6407284..229c301c3a 100644
--- a/test/index.ts
+++ b/test/index.ts
@@ -5,7 +5,6 @@ import path = require('path')
 import exists = require('path-exists')
 import rimraf = require('rimraf-then')
 import testDefaults from './utils/testDefaults'
-import isExecutable from './utils/isExecutable'
 
 const fixtures = path.join(__dirname, 'fixtures')
 
@@ -19,7 +18,7 @@ test('installing a simple project', async (t) => {
   t.ok(project.requireModule('is-negative'), 'dev dep installed')
   t.ok(project.requireModule('colors'), 'optional dep installed')
 
-  await isExecutable(t, path.join(prefix, 'node_modules', '.bin', 'rimraf'))
+  await project.isExecutable('.bin/rimraf')
 
   t.end()
 })
diff --git a/test/utils/isExecutable.ts b/test/utils/isExecutable.ts
deleted file mode 100644
index a0173188e2..0000000000
--- a/test/utils/isExecutable.ts
+++ /dev/null
@@ -1,18 +0,0 @@
-import isWindows = require('is-windows')
-import isexe = require('isexe')
-import fs = require('mz/fs')
-import {Test} from 'tape'
-
-const IS_WINDOWS = isWindows()
-
-export default async function isExecutable (t: Test, filePath: string) {
-  if (IS_WINDOWS) {
-    t.ok(isexe(filePath), `${filePath} is executable`)
-    return
-  }
-
-  const stat = await fs.stat(filePath)
-  t.equal(stat.mode, parseInt('100755', 8), `${filePath} is executable`)
-  t.ok(stat.isFile(), `${filePath} refers to a file`)
-  return
-}