Initial attempt at Monitor class.

spec/process_shared/monitor_spec.rb

@@ -0,0 +1,34 @@
+require 'spec_helper'
+require 'process_shared'
+
+module ProcessShared
+  describe Monitor do
+
+    include LockBehavior
+
+    before :each do
+      @lock = Monitor.new
+    end
+
+    it 'raises exception when unlocked by other process' do
+      pid = Kernel.fork do
+        @lock.lock
+        sleep 0.2
+        @lock.unlock
+        Kernel.exit!
+      end
+
+      sleep 0.1
+      proc { @lock.unlock }.must_raise(ProcessError)
+
+      ::Process.wait(pid)
+    end
+
+    it 'raises nothing with nested lock' do
+      @lock.lock
+      @lock.lock
+      @lock.unlock
+      @lock.unlock
+    end
+  end
+end