1 files changed, 28 insertions, 0 deletions
diff --git a/spec/ruby/optional/capi/numeric_spec.rb b/spec/ruby/optional/capi/numeric_spec.rb
index d76f353850..de7e180414 100644
--- a/spec/ruby/optional/capi/numeric_spec.rb
+++ b/spec/ruby/optional/capi/numeric_spec.rb
@@ -143,6 +143,34 @@ describe "CApiNumericSpecs" do
     end
   end
 
+  describe "NUM2SHORT" do
+    it "raises a TypeError if passed nil" do
+      -> { @s.NUM2SHORT(nil) }.should raise_error(TypeError)
+    end
+
+    it "converts a Float" do
+      @s.NUM2SHORT(4.2).should == 4
+    end
+
+    it "converts a Fixnum" do
+      @s.NUM2SHORT(5).should == 5
+    end
+
+    it "converts -1 to an signed number" do
+      @s.NUM2SHORT(-1).should == -1
+    end
+
+    it "raises a RangeError if the value is more than 32bits" do
+      -> { @s.NUM2SHORT(0xffff_ffff+1) }.should raise_error(RangeError)
+    end
+
+    it "calls #to_int to coerce the value" do
+      obj = mock("number")
+      obj.should_receive(:to_int).and_return(2)
+      @s.NUM2SHORT(obj).should == 2
+    end
+  end
+
   describe "INT2NUM" do
     it "raises a TypeError if passed nil" do
       -> { @s.INT2NUM(nil) }.should raise_error(TypeError)