Add in-tree mspec and ruby/spec

* For easier modifications of ruby/spec by MRI developers.
* .gitignore: track changes under spec.
* spec/mspec, spec/rubyspec: add in-tree mspec and ruby/spec.
  These files can therefore be updated like any other file in MRI.
  Instructions are provided in spec/README.
  [Feature #13156] [ruby-core:79246]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58595 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 39 insertions, 0 deletions

diff --git a/spec/rubyspec/language/undef_spec.rb b/spec/rubyspec/language/undef_spec.rb
new file mode 100644
index 0000000000..45fe4e9043
--- /dev/null
+++ b/spec/rubyspec/language/undef_spec.rb
@@ -0,0 +1,39 @@
+require File.expand_path('../../spec_helper', __FILE__)
+
+describe "The undef keyword" do
+  it "undefines a method" do
+    undef_class = Class.new do
+      def meth(o); o; end
+    end
+    obj = undef_class.new
+    obj.meth(5).should == 5
+    undef_class.class_eval do
+      undef meth
+    end
+    lambda { obj.meth(5) }.should raise_error(NoMethodError)
+  end
+
+  it "allows undefining multiple methods at a time" do
+    undef_multiple = Class.new do
+      def method1; end
+      def method2; :nope; end
+
+      undef :method1, :method2
+    end
+
+    obj = undef_multiple.new
+    obj.respond_to?(:method1).should == false
+    obj.respond_to?(:method2).should == false
+  end
+
+  it "raises a NameError when passed a missing name" do
+    Class.new do
+      lambda {
+         undef not_exist 
+      }.should raise_error(NameError) { |e|
+        # a NameError and not a NoMethodError
+        e.class.should == NameError
+      }
+    end
+  end
+end