added weakref spec

test/test/spec/weakref_spec.rb

@@ -0,0 +1,35 @@
+describe "WeakRef" do
+  it "creates proxy objects that forward messages" do
+    ary = [1, 2, 3]
+    ref = WeakRef.new(ary)
+    ref.class.should == Array
+    ref[0].should == 1
+    ref[1].should == 2
+    ref[2].should == 3
+    ref.should == ary
+  end
+
+  it "creates proxy objects that forward respond_to?" do
+    ary = [1, 2, 3]
+    ref = WeakRef.new(ary)
+    ary.methods.each { |x| ref.respond_to?(x).should == true }
+  end
+
+  it "creates weak references" do
+    obj = Object.new
+    rc = obj.retainCount
+    ref = WeakRef.new(obj)
+    obj.retainCount.should == rc
+  end
+
+  it "passes the internal reference when given to ObjC APIs" do
+    ary = [1, 2, 3]
+    ref = WeakRef.new(ary)
+    ary2 = NSArray.arrayWithArray(ref)
+    ary2.should == ary
+  end
+
+  it "cannot be subclassed" do
+    lambda { class Foo < WeakRef; end }.should.raise(RuntimeError)
+  end
+end