1 files changed, 46 insertions, 0 deletions
diff --git a/spec/ruby/core/module/define_method_spec.rb b/spec/ruby/core/module/define_method_spec.rb
index 49472c18e1..0cb2ab140c 100644
--- a/spec/ruby/core/module/define_method_spec.rb
+++ b/spec/ruby/core/module/define_method_spec.rb
@@ -88,6 +88,23 @@ describe "Module#define_method when given an UnboundMethod" do
   end
 end
 
+describe "Module#define_method" do
+  describe "when the default definee is not the same as the module" do
+    it "sets the visibility of the method to public" do
+      klass = Class.new
+      class << klass
+        private
+        define_method(:meta) do
+          define_method(:foo) { :foo }
+        end
+      end
+
+      klass.send :meta
+      klass.new.foo.should == :foo
+    end
+  end
+end
+
 describe "Module#define_method when name is not a special private name" do
   describe "given an UnboundMethod" do
     describe "and called from the target module" do
@@ -491,7 +508,36 @@ describe "Module#define_method" do
     it "receives the value passed as the argument when passed one argument" do
       @klass.new.m(1).should == 1
     end
+  end
+
+  describe "passed { |a,|  } creates a method that" do
+    before :each do
+      @klass = Class.new do
+        define_method(:m) { |a,| a }
+      end
+    end
 
+    it "raises an ArgumentError when passed zero arguments" do
+      -> { @klass.new.m }.should raise_error(ArgumentError)
+    end
+
+    it "raises an ArgumentError when passed zero arguments and a block" do
+      -> { @klass.new.m { :computed } }.should raise_error(ArgumentError)
+    end
+
+    it "raises an ArgumentError when passed two arguments" do
+      -> { @klass.new.m 1, 2 }.should raise_error(ArgumentError)
+    end
+
+    it "receives the value passed as the argument when passed one argument" do
+      @klass.new.m(1).should == 1
+    end
+
+    it "does not destructure the passed argument" do
+      @klass.new.m([1, 2]).should == [1, 2]
+      # for comparison:
+      proc { |a,| a }.call([1, 2]).should == 1
+    end
   end
 
   describe "passed { |*a|  } creates a method that" do