test(config): Check for the correct symbolic link before test:client (k…

…arma-runner#3392)

Fixes karma-runner#3391

test/client/karma.conf.js

@@ -1,3 +1,5 @@
+const fs = require('fs')
+
 var TRAVIS_WITHOUT_BS = process.env.TRAVIS_SECURE_ENV_VARS === 'false'
 
 var launchers = {
@@ -43,6 +45,27 @@ var launchers = {
  }
 }
 
+// Verify the install. This will run async but that's ok we'll see the log.
+fs.lstat('node_modules/karma', (err, stats) => {
+ if (err) {
+ console.error('Cannot verify installation', err.stack || err)
+ }
+ if (stats && stats.isSymbolicLink()) {
+ return
+ }
+
+ console.log('**** Incorrect directory layout for karma self-tests ****')
+ console.log(`
+ $ npm install
+ $ rm -rf node_modules/karma
+ $ cd node_modules
+ $ ln -s ../ karma
+ $ cd ../
+ $ grunt browserify
+ `)
+ process.exit(1)
+})
+
 var browsers = []
 
 if (process.env.TRAVIS) {