1 files changed, 22 insertions, 0 deletions
diff --git a/spec/ruby/library/win32ole/win32ole_param/optional_spec.rb b/spec/ruby/library/win32ole/win32ole_param/optional_spec.rb
new file mode 100644
index 0000000000..ca676e0950
--- /dev/null
+++ b/spec/ruby/library/win32ole/win32ole_param/optional_spec.rb
@@ -0,0 +1,22 @@
+require_relative "../../../spec_helper"
+platform_is :windows do
+  require 'win32ole'
+
+  describe "WIN32OLE::Param#optional?" do
+    before :each do
+      ole_type_detail = WIN32OLE::Type.new("Microsoft Scripting Runtime", "FileSystemObject")
+      m_copyfile = WIN32OLE::Method.new(ole_type_detail, "CopyFile")
+      @param_overwritefiles = m_copyfile.params[2]
+    end
+
+    it "raises ArgumentError if argument is given" do
+      -> { @param_overwritefiles.optional?(1) }.should.raise ArgumentError
+    end
+
+    it "returns true for 3rd parameter of FileSystemObject's 'CopyFile' method" do
+      @param_overwritefiles.optional?.should == true
+    end
+
+  end
+
+end