Add specs for rb_struct_define

Author: kaorimatz

optional/capi/struct_spec.rb

@@ -65,6 +65,18 @@
  @struct = @klass.new
  end
 
+ describe "rb_struct_define" do
+ ruby_version_is "2.2" do
+ it "raises an ArgumentError if arguments contain duplicate member name" do
+ lambda { @s.rb_struct_define(nil, "a", "b", "a") }.should raise_error(ArgumentError)
+ end
+ end
+
+ it "raises a NameError if an invalid constant name is given" do
+ lambda { @s.rb_struct_define("foo", "a", "b", "c") }.should raise_error(NameError)
+ end
+ end
+
  describe "rb_struct_aref" do
  it "returns the value of a struct member with a symbol key" do
  @struct[:a] = 2