diff --git a/scripts/test.js b/scripts/test.js
index 9c17521c..520c3464 100644
--- a/scripts/test.js
+++ b/scripts/test.js
@@ -16,27 +16,8 @@ process.on('unhandledRejection', err => {
 require('../config/env')
 
 const jest = require('jest')
-const execSync = require('child_process').execSync
 let argv = process.argv.slice(2)
 
-function isInGitRepository () {
-  try {
-    execSync('git rev-parse --is-inside-work-tree', { stdio: 'ignore' })
-    return true
-  } catch (e) {
-    return false
-  }
-}
-
-function isInMercurialRepository () {
-  try {
-    execSync('hg --cwd . root', { stdio: 'ignore' })
-    return true
-  } catch (e) {
-    return false
-  }
-}
-
 // Watch unless on CI, in coverage mode, or explicitly running all tests
 if (
   !process.env.CI &&
@@ -44,8 +25,7 @@ if (
   argv.indexOf('--watchAll') === -1
 ) {
   // https://github.com/facebook/create-react-app/issues/5210
-  const hasSourceControl = isInGitRepository() || isInMercurialRepository()
-  argv.push(hasSourceControl ? '--watch' : '--watchAll')
+  argv.push('--watchAll')
 }
 
 jest.run(argv)