1 files changed, 32 insertions, 0 deletions
diff --git a/spec/ruby/core/mutex/try_lock_spec.rb b/spec/ruby/core/mutex/try_lock_spec.rb
new file mode 100644
index 0000000000..3e875ff9ec
--- /dev/null
+++ b/spec/ruby/core/mutex/try_lock_spec.rb
@@ -0,0 +1,32 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "Mutex#try_lock" do
+  describe "when unlocked" do
+    it "returns true" do
+      m = Mutex.new
+      m.try_lock.should be_true
+    end
+
+    it "locks the mutex" do
+      m = Mutex.new
+      m.try_lock
+      m.locked?.should be_true
+    end
+  end
+
+  describe "when locked by the current thread" do
+    it "returns false" do
+      m = Mutex.new
+      m.lock
+      m.try_lock.should be_false
+    end
+  end
+
+  describe "when locked by another thread" do
+    it "returns false" do
+      m = Mutex.new
+      m.lock
+      Thread.new { m.try_lock }.value.should be_false
+    end
+  end
+end