1 files changed, 14 insertions, 4 deletions
diff --git a/spec/ruby/core/mutex/owned_spec.rb b/spec/ruby/core/mutex/owned_spec.rb
index 2e1c3f2481..ea7d5faf1c 100644
--- a/spec/ruby/core/mutex/owned_spec.rb
+++ b/spec/ruby/core/mutex/owned_spec.rb
@@ -1,10 +1,10 @@
-require File.expand_path('../../../spec_helper', __FILE__)
+require_relative '../../spec_helper'
 
 describe "Mutex#owned?" do
   describe "when unlocked" do
     it "returns false" do
       m = Mutex.new
-      m.owned?.should be_false
+      m.owned?.should == false
     end
   end
 
@@ -12,7 +12,7 @@ describe "Mutex#owned?" do
     it "returns true" do
       m = Mutex.new
       m.lock
-      m.owned?.should be_true
+      m.owned?.should == true
     end
   end
 
@@ -37,7 +37,17 @@ describe "Mutex#owned?" do
       end
 
       Thread.pass until locked
-      m.owned?.should be_false
+      m.owned?.should == false
     end
   end
+
+  it "is held per Fiber" do
+    m = Mutex.new
+    m.lock
+
+    Fiber.new do
+      m.locked?.should == true
+      m.owned?.should == false
+    end.resume
+  end
 end