Move spec/rubyspec to spec/ruby for consistency

* Other ruby implementations use the spec/ruby directory.
  [Misc #13792] [ruby-core:82287]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59979 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

spec/ruby/library/set/flatten_merge_spec.rb

@@ -0,0 +1,23 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require 'set'
+
+describe "Set#flatten_merge" do
+  it "is protected" do
+    Set.should have_protected_instance_method("flatten_merge")
+  end
+
+  it "flattens the passed Set and merges it into self" do
+    set1 = Set[1, 2]
+    set2 = Set[3, 4, Set[5, 6]]
+
+    set1.send(:flatten_merge, set2).should == Set[1, 2, 3, 4, 5, 6]
+  end
+
+  it "raises an ArgumentError when trying to flatten a recursive Set" do
+    set1 = Set[1, 2, 3]
+    set2 = Set[5, 6, 7]
+    set2 << set2
+
+    lambda { set1.send(:flatten_merge, set2) }.should raise_error(ArgumentError)
+  end
+end