Add specs for ELECTRON_NO_ASAR env var

spec/fixtures/module/no-asar.js

@@ -0,0 +1,15 @@
+const fs = require('fs')
+const path = require('path')
+
+const stats = fs.statSync(path.join(__dirname, '..', 'asar', 'a.asar'))
+
+const details = {
+  isFile: stats.isFile(),
+  size: stats.size
+}
+
+if (process.send != null) {
+  process.send(details)
+} else {
+  console.log(JSON.stringify(details))
+}