Fix renderer stdio in Electron 5

Author: inukshuk

bin/electron-mocha

@@ -35,9 +35,12 @@ function run (electron) {
     ...process.argv.slice(2)
   ]
 
-  let child = spawn(electron, args, {
-    stdio: 'inherit'
-  })
+  let child = spawn(electron, args)
+
+  // stdio 'inherit' not work reliably in Renderer!
+  child.stdout.pipe(process.stdout)
+  child.stderr.pipe(process.stderr)
+  process.stdin.pipe(child.stdin)
 
   child.on('exit', (code, signal) => {
     if (signal) {

test/mocha.opts

@@ -1,2 +1,3 @@
+--color
 --require test/support/require
 --require-main test/support/requireMain