1 files changed, 43 insertions, 0 deletions
diff --git a/spec/ruby/core/mutex/owned_spec.rb b/spec/ruby/core/mutex/owned_spec.rb
new file mode 100644
index 0000000000..2e1c3f2481
--- /dev/null
+++ b/spec/ruby/core/mutex/owned_spec.rb
@@ -0,0 +1,43 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "Mutex#owned?" do
+  describe "when unlocked" do
+    it "returns false" do
+      m = Mutex.new
+      m.owned?.should be_false
+    end
+  end
+
+  describe "when locked by the current thread" do
+    it "returns true" do
+      m = Mutex.new
+      m.lock
+      m.owned?.should be_true
+    end
+  end
+
+  describe "when locked by another thread" do
+    before :each do
+      @checked = false
+    end
+
+    after :each do
+      @checked = true
+      @th.join
+    end
+
+    it "returns false" do
+      m = Mutex.new
+      locked = false
+
+      @th = Thread.new do
+        m.lock
+        locked = true
+        Thread.pass until @checked
+      end
+
+      Thread.pass until locked
+      m.owned?.should be_false
+    end
+  end
+end