fixing stat_watcher spec to not fail randomly

spec/stat_watcher_spec.rb

@@ -2,11 +2,13 @@
 
 TEMP_FILE_PATH = "./test.txt"
 
+INTERVAL = 0.010
+
 class MyStatWatcher < Cool.io::StatWatcher
   attr_accessor :accessed, :previous, :current
 
   def initialize(path)
-    super path, 0.010
+    super path, INTERVAL
   end
 
   def on_change(previous, current)
@@ -18,15 +20,31 @@ def on_change(previous, current)
 
 def run_with_file_change(path)
   reactor = Cool.io::Loop.default
+
   sw = MyStatWatcher.new(path)
   sw.attach(reactor)
-  File.open(path, "a+") { |f| f.write(rand.to_s) }
-  reactor.run_once
+
+  tw = Cool.io::TimerWatcher.new(INTERVAL, true)
+  tw.on_timer do
+    reactor.stop if sw.accessed
+    File.open(path, "w+") { |f| f.write(rand.to_s) }
+  end
+  tw.attach(reactor)
+
+  reactor.run
+
+  tw.detach
+  sw.detach
+
   sw
 end
 
 describe Cool.io::StatWatcher do
 
+  let :sw do
+    run_with_file_change(TEMP_FILE_PATH)
+  end
+
   before :each do
     `touch #{TEMP_FILE_PATH}`
   end
@@ -36,14 +54,10 @@ def run_with_file_change(path)
   end
 
   it "fire on_change when the file it is watching is modified" do
-    sw = run_with_file_change(TEMP_FILE_PATH)
-
     sw.accessed.should eql(true)
   end
 
   it "should pass previous and current file stat info given a stat watcher" do
-    sw = run_with_file_change(TEMP_FILE_PATH)
-
     sw.previous.ino.should eql(sw.current.ino)
   end