1 files changed, 28 insertions, 0 deletions
diff --git a/spec/ruby/library/monitor/enter_spec.rb b/spec/ruby/library/monitor/enter_spec.rb
new file mode 100644
index 0000000000..f523c42087
--- /dev/null
+++ b/spec/ruby/library/monitor/enter_spec.rb
@@ -0,0 +1,28 @@
+require_relative '../../spec_helper'
+require 'monitor'
+
+describe "Monitor#enter" do
+  it "acquires the monitor" do
+    monitor = Monitor.new
+    10.times do
+      wait_q = Queue.new
+      continue_q = Queue.new
+
+      thread = Thread.new do
+        begin
+          monitor.enter
+          wait_q << true
+          continue_q.pop
+        ensure
+          monitor.exit
+        end
+      end
+
+      wait_q.pop
+      monitor.mon_locked?.should == true
+      continue_q << true
+      thread.join
+      monitor.mon_locked?.should == false
+    end
+  end
+end