Properly use writeSync

spec/jasmine-helper.coffee

@@ -11,22 +11,23 @@ module.exports.runSpecSuite = (specSuite, logFile, logErrors=true) ->
   timeReporter = new TimeReporter()
 
   logStream = fs.openSync(logFile, 'w') if logFile?
-  log = (args...) ->
+  log = (str) ->
     if logStream?
-      fs.writeSync(args...)
+      fs.writeSync(logStream, str)
     else
-      process.stderr.write(args...)
+      process.stderr.write(str)
 
   if atom.getLoadSettings().exitWhenDone
     {jasmineNode} = require 'jasmine-node/lib/jasmine-node/reporter'
     reporter = new jasmineNode.TerminalReporter
-      print: (args...) ->
-        log(args...)
+      print: (str) ->
+        log(str)
       onComplete: (runner) ->
         log('\n')
         timeReporter.logLongestSuites 10, (line) -> log("#{line}\n")
         log('\n')
         timeReporter.logLongestSpecs 10, (line) -> log("#{line}\n")
+        fs.closeSync(logStream) if logStream?
         atom.exit(runner.results().failedCount > 0 ? 1 : 0)
   else
     AtomReporter = require './atom-reporter'