diff --git a/tests/player.stdio.js b/tests/player.stdio.js
index ec16054..9b71e6f 100644
--- a/tests/player.stdio.js
+++ b/tests/player.stdio.js
@@ -16,60 +16,47 @@ const formats = [
     extensions: /z([3458]|blorb)$/,
     engine: 'bocfel.js',
   },
-
   {
     id: 'glulxe',
     extensions: /(gblorb|ulx)$/,
     engine: 'glulxe.js',
   },
-
   {
     id: 'git',
     extensions: /(gblorb|ulx)$/,
     engine: 'git.js',
   },
-
   {
     id: 'hugo',
     extensions: /hex$/,
     engine: 'hugo.js',
   },
-
   {
     id: 'tads',
     extensions: /(gam|t3)$/,
     engine: 'tads.js',
-  },
+  }
 ]
 
-function run() {
-  const argv = minimist(process.argv.slice(2))
 
-  const storyfile = argv._[0]
+const argv = minimist(process.argv.slice(2))
+const storyfile = argv._[0]
 
-  let format
-  for (const formatspec of formats) {
-    if (
-      formatspec.id === argv.vm ||
-      (!argv.vm && formatspec.extensions.test(storyfile))
-    ) {
-      format = formatspec
-      break
-    }
-  }
+const format = formats.find(x =>
+  x.extensions.test(storyfile))
 
-  if (!format) {
-    console.error('Unknown storyfile format')
-    return
-  }
-
-  const { glkInterface, sendFn } = CheapGlkOte(handlers)
-  handlers.setSend(sendFn)
-
-  const engine = require('emglken/src/' + format.engine)
-  const vm = new engine()
-  vm.prepare(fs.readFileSync(storyfile), glkInterface)
-  vm.start()
+if (!format) {
+  console.error('Unknown storyfile format')
+  return
 }
 
-run()
+const { glkInterface, sendFn } = CheapGlkOte(handlers)
+handlers.setSend(sendFn)
+
+const engine = require('emglken/src/' + format.engine)
+const vm = new engine()
+
+vm.prepare(
+  fs.readFileSync(storyfile),
+  glkInterface)
+vm.start()