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

27 files changed, 550 insertions, 0 deletions

diff --git a/spec/rubyspec/library/readline/basic_quote_characters_spec.rb b/spec/rubyspec/library/readline/basic_quote_characters_spec.rb
new file mode 100644
index 0000000000..7d25df2047
--- /dev/null
+++ b/spec/rubyspec/library/readline/basic_quote_characters_spec.rb
@@ -0,0 +1,18 @@
+require File.expand_path('../spec_helper', __FILE__)
+
+platform_is_not :darwin do
+  with_feature :readline do
+    describe "Readline.basic_quote_characters" do
+      it "returns not nil" do
+        Readline.basic_quote_characters.should_not be_nil
+      end
+    end
+
+    describe "Readline.basic_quote_characters=" do
+      it "returns the passed string" do
+        Readline.basic_quote_characters = "test"
+        Readline.basic_quote_characters.should == "test"
+      end
+    end
+  end
+end
diff --git a/spec/rubyspec/library/readline/basic_word_break_characters_spec.rb b/spec/rubyspec/library/readline/basic_word_break_characters_spec.rb
new file mode 100644
index 0000000000..c2ec6cede7
--- /dev/null
+++ b/spec/rubyspec/library/readline/basic_word_break_characters_spec.rb
@@ -0,0 +1,16 @@
+require File.expand_path('../spec_helper', __FILE__)
+
+with_feature :readline do
+  describe "Readline.basic_word_break_characters" do
+    it "returns not nil" do
+      Readline.basic_word_break_characters.should_not be_nil
+    end
+  end
+
+  describe "Readline.basic_word_break_characters=" do
+    it "returns the passed string" do
+      Readline.basic_word_break_characters = "test"
+      Readline.basic_word_break_characters.should == "test"
+    end
+  end
+end
diff --git a/spec/rubyspec/library/readline/completer_quote_characters_spec.rb b/spec/rubyspec/library/readline/completer_quote_characters_spec.rb
new file mode 100644
index 0000000000..a836a0591e
--- /dev/null
+++ b/spec/rubyspec/library/readline/completer_quote_characters_spec.rb
@@ -0,0 +1,16 @@
+require File.expand_path('../spec_helper', __FILE__)
+
+with_feature :readline do
+  describe "Readline.completer_quote_characters" do
+    it "returns nil" do
+      Readline.completer_quote_characters.should be_nil
+    end
+  end
+
+  describe "Readline.completer_quote_characters=" do
+    it "returns the passed string" do
+      Readline.completer_quote_characters = "test"
+      Readline.completer_quote_characters.should == "test"
+    end
+  end
+end
diff --git a/spec/rubyspec/library/readline/completer_word_break_characters_spec.rb b/spec/rubyspec/library/readline/completer_word_break_characters_spec.rb
new file mode 100644
index 0000000000..2e0cc277a6
--- /dev/null
+++ b/spec/rubyspec/library/readline/completer_word_break_characters_spec.rb
@@ -0,0 +1,16 @@
+require File.expand_path('../spec_helper', __FILE__)
+
+with_feature :readline do
+  describe "Readline.completer_word_break_characters" do
+    it "returns nil" do
+      Readline.completer_word_break_characters.should be_nil
+    end
+  end
+
+  describe "Readline.completer_word_break_characters=" do
+    it "returns the passed string" do
+      Readline.completer_word_break_characters = "test"
+      Readline.completer_word_break_characters.should == "test"
+    end
+  end
+end
diff --git a/spec/rubyspec/library/readline/completion_append_character_spec.rb b/spec/rubyspec/library/readline/completion_append_character_spec.rb
new file mode 100644
index 0000000000..ee41abea05
--- /dev/null
+++ b/spec/rubyspec/library/readline/completion_append_character_spec.rb
@@ -0,0 +1,16 @@
+require File.expand_path('../spec_helper', __FILE__)
+
+with_feature :readline do
+  describe "Readline.completion_append_character" do
+    it "returns not nil" do
+      Readline.completion_append_character.should_not be_nil
+    end
+  end
+
+  describe "Readline.completion_append_character=" do
+    it "returns the first character of the passed string" do
+      Readline.completion_append_character = "test"
+      Readline.completion_append_character.should == "t"
+    end
+  end
+end
diff --git a/spec/rubyspec/library/readline/completion_case_fold_spec.rb b/spec/rubyspec/library/readline/completion_case_fold_spec.rb
new file mode 100644
index 0000000000..604460869e
--- /dev/null
+++ b/spec/rubyspec/library/readline/completion_case_fold_spec.rb
@@ -0,0 +1,18 @@
+require File.expand_path('../spec_helper', __FILE__)
+
+with_feature :readline do
+  describe "Readline.completion_case_fold" do
+    it "returns nil" do
+      Readline.completion_case_fold.should be_nil
+    end
+  end
+
+  describe "Readline.completion_case_fold=" do
+    it "returns the passed boolean" do
+      Readline.completion_case_fold = true
+      Readline.completion_case_fold.should == true
+      Readline.completion_case_fold = false
+      Readline.completion_case_fold.should == false
+    end
+  end
+end
diff --git a/spec/rubyspec/library/readline/completion_proc_spec.rb b/spec/rubyspec/library/readline/completion_proc_spec.rb
new file mode 100644
index 0000000000..e525fbd191
--- /dev/null
+++ b/spec/rubyspec/library/readline/completion_proc_spec.rb
@@ -0,0 +1,22 @@
+require File.expand_path('../spec_helper', __FILE__)
+
+with_feature :readline do
+  describe "Readline.completion_proc" do
+    it "returns nil" do
+      Readline.completion_proc.should be_nil
+    end
+  end
+
+  describe "Readline.completion_proc=" do
+    it "returns the passed Proc" do
+      proc = Proc.new do |e|
+      end
+      Readline.completion_proc = proc
+      Readline.completion_proc.should == proc
+    end
+
+    it "returns an ArgumentError if not given an Proc or #call" do
+      lambda { Readline.completion_proc = "test" }.should raise_error(ArgumentError)
+    end
+  end
+end
diff --git a/spec/rubyspec/library/readline/constants_spec.rb b/spec/rubyspec/library/readline/constants_spec.rb
new file mode 100644
index 0000000000..226a3509b9
--- /dev/null
+++ b/spec/rubyspec/library/readline/constants_spec.rb
@@ -0,0 +1,18 @@
+require File.expand_path('../spec_helper', __FILE__)
+
+with_feature :readline do
+  # Note: additional specs for HISTORY are in 'history' subdir.
+  describe "Readline::HISTORY" do
+    it "is defined" do
+      Readline.const_defined?(:HISTORY).should == true
+    end
+  end
+
+  describe "Readline::VERSION" do
+    it "is defined and is a non-empty String" do
+      Readline.const_defined?(:VERSION).should == true
+      Readline::VERSION.should be_kind_of(String)
+      Readline::VERSION.should_not be_empty
+    end
+  end
+end
diff --git a/spec/rubyspec/library/readline/emacs_editing_mode_spec.rb b/spec/rubyspec/library/readline/emacs_editing_mode_spec.rb
new file mode 100644
index 0000000000..6c2e84b08f
--- /dev/null
+++ b/spec/rubyspec/library/readline/emacs_editing_mode_spec.rb
@@ -0,0 +1,11 @@
+require File.expand_path('../spec_helper', __FILE__)
+
+platform_is_not :darwin do
+  with_feature :readline do
+    describe "Readline.emacs_editing_mode" do
+      it "returns nil" do
+        Readline.emacs_editing_mode.should be_nil
+      end
+    end
+  end
+end
diff --git a/spec/rubyspec/library/readline/filename_quote_characters_spec.rb b/spec/rubyspec/library/readline/filename_quote_characters_spec.rb
new file mode 100644
index 0000000000..abee5e9700
--- /dev/null
+++ b/spec/rubyspec/library/readline/filename_quote_characters_spec.rb
@@ -0,0 +1,18 @@
+require File.expand_path('../spec_helper', __FILE__)
+
+platform_is_not :darwin do
+  with_feature :readline do
+    describe "Readline.filename_quote_characters" do
+      it "returns nil" do
+        Readline.filename_quote_characters.should be_nil
+      end
+    end
+
+    describe "Readline.filename_quote_characters=" do
+      it "returns the passed string" do
+        Readline.filename_quote_characters = "test"
+        Readline.filename_quote_characters.should == "test"
+      end
+    end
+  end
+end
diff --git a/spec/rubyspec/library/readline/history/append_spec.rb b/spec/rubyspec/library/readline/history/append_spec.rb
new file mode 100644
index 0000000000..3ea0bbf57f
--- /dev/null
+++ b/spec/rubyspec/library/readline/history/append_spec.rb
@@ -0,0 +1,28 @@
+require File.expand_path('../../spec_helper', __FILE__)
+
+with_feature :readline do
+  describe "Readline::HISTORY.<<" do
+    it "appends the given Object to the history" do
+      Readline::HISTORY << "1"
+      Readline::HISTORY.size.should == 1
+
+      Readline::HISTORY << "2"
+      Readline::HISTORY.size.should == 2
+
+      Readline::HISTORY.pop.should == "2"
+      Readline::HISTORY.pop.should == "1"
+    end
+
+    it "tries to convert the passed Object to a String using #to_str" do
+      obj = mock("Converted to String")
+      obj.should_receive(:to_str).and_return("converted")
+
+      Readline::HISTORY << obj
+      Readline::HISTORY.pop.should == "converted"
+    end
+
+    it "raises a TypeError when the passed Object can't be converted to a String" do
+      lambda { Readline::HISTORY << mock("Object") }.should raise_error(TypeError)
+    end
+  end
+end
diff --git a/spec/rubyspec/library/readline/history/delete_at_spec.rb b/spec/rubyspec/library/readline/history/delete_at_spec.rb
new file mode 100644
index 0000000000..38f180ca08
--- /dev/null
+++ b/spec/rubyspec/library/readline/history/delete_at_spec.rb
@@ -0,0 +1,45 @@
+require File.expand_path('../../spec_helper', __FILE__)
+
+with_feature :readline do
+  describe "Readline::HISTORY.delete_at" do
+    it "deletes and returns the history entry at the specified index" do
+      Readline::HISTORY.push("1", "2", "3")
+
+      Readline::HISTORY.delete_at(1).should == "2"
+      Readline::HISTORY.size.should == 2
+
+      Readline::HISTORY.delete_at(1).should == "3"
+      Readline::HISTORY.size.should == 1
+
+      Readline::HISTORY.delete_at(0).should == "1"
+      Readline::HISTORY.size.should == 0
+
+
+      Readline::HISTORY.push("1", "2", "3", "4")
+
+      Readline::HISTORY.delete_at(-2).should == "3"
+      Readline::HISTORY.size.should == 3
+
+      Readline::HISTORY.delete_at(-2).should == "2"
+      Readline::HISTORY.size.should == 2
+
+      Readline::HISTORY.delete_at(0).should == "1"
+      Readline::HISTORY.size.should == 1
+
+      Readline::HISTORY.delete_at(0).should == "4"
+      Readline::HISTORY.size.should == 0
+    end
+
+    it "raises an IndexError when the given index is greater than the history size" do
+      lambda { Readline::HISTORY.delete_at(10) }.should raise_error(IndexError)
+      lambda { Readline::HISTORY.delete_at(-10) }.should raise_error(IndexError)
+    end
+
+    it "taints the returned strings" do
+      Readline::HISTORY.push("1", "2", "3")
+      Readline::HISTORY.delete_at(0).tainted?.should be_true
+      Readline::HISTORY.delete_at(0).tainted?.should be_true
+      Readline::HISTORY.delete_at(0).tainted?.should be_true
+    end
+  end
+end
diff --git a/spec/rubyspec/library/readline/history/each_spec.rb b/spec/rubyspec/library/readline/history/each_spec.rb
new file mode 100644
index 0000000000..5057e04970
--- /dev/null
+++ b/spec/rubyspec/library/readline/history/each_spec.rb
@@ -0,0 +1,29 @@
+require File.expand_path('../../spec_helper', __FILE__)
+
+with_feature :readline do
+  describe "Readline::HISTORY.each" do
+    before :each do
+      Readline::HISTORY.push("1", "2", "3")
+    end
+
+    after :each do
+      Readline::HISTORY.pop
+      Readline::HISTORY.pop
+      Readline::HISTORY.pop
+    end
+
+    it "yields each item in the history" do
+      result = []
+      Readline::HISTORY.each do |x|
+        result << x
+      end
+      result.should == ["1", "2", "3"]
+    end
+
+    it "yields tainted Objects" do
+      Readline::HISTORY.each do |x|
+        x.tainted?.should be_true
+      end
+    end
+  end
+end
diff --git a/spec/rubyspec/library/readline/history/element_reference_spec.rb b/spec/rubyspec/library/readline/history/element_reference_spec.rb
new file mode 100644
index 0000000000..c656179ddd
--- /dev/null
+++ b/spec/rubyspec/library/readline/history/element_reference_spec.rb
@@ -0,0 +1,40 @@
+require File.expand_path('../../spec_helper', __FILE__)
+
+with_feature :readline do
+  describe "Readline::HISTORY.[]" do
+    before :each do
+      Readline::HISTORY.push("1", "2", "3")
+    end
+
+    after :each do
+      Readline::HISTORY.pop
+      Readline::HISTORY.pop
+      Readline::HISTORY.pop
+    end
+
+    it "returns tainted objects" do
+      Readline::HISTORY[0].tainted?.should be_true
+      Readline::HISTORY[1].tainted?.should be_true
+    end
+
+    it "returns the history item at the passed index" do
+      Readline::HISTORY[0].should == "1"
+      Readline::HISTORY[1].should == "2"
+      Readline::HISTORY[2].should == "3"
+
+      Readline::HISTORY[-1].should == "3"
+      Readline::HISTORY[-2].should == "2"
+      Readline::HISTORY[-3].should == "1"
+    end
+
+    it "raises an IndexError when there is no item at the passed index" do
+      lambda { Readline::HISTORY[-10] }.should raise_error(IndexError)
+      lambda { Readline::HISTORY[-9] }.should raise_error(IndexError)
+      lambda { Readline::HISTORY[-8] }.should raise_error(IndexError)
+
+      lambda { Readline::HISTORY[8] }.should raise_error(IndexError)
+      lambda { Readline::HISTORY[9] }.should raise_error(IndexError)
+      lambda { Readline::HISTORY[10] }.should raise_error(IndexError)
+    end
+  end
+end
diff --git a/spec/rubyspec/library/readline/history/element_set_spec.rb b/spec/rubyspec/library/readline/history/element_set_spec.rb
new file mode 100644
index 0000000000..8d6fe196ef
--- /dev/null
+++ b/spec/rubyspec/library/readline/history/element_set_spec.rb
@@ -0,0 +1,35 @@
+require File.expand_path('../../spec_helper', __FILE__)
+
+with_feature :readline do
+  describe "Readline::HISTORY.[]=" do
+    before :each do
+      Readline::HISTORY.push("1", "2", "3")
+    end
+
+    after :each do
+      Readline::HISTORY.pop
+      Readline::HISTORY.pop
+      Readline::HISTORY.pop
+    end
+
+    it "returns the new value for the passed index" do
+      (Readline::HISTORY[1] = "second test").should == "second test"
+    end
+
+    it "raises an IndexError when there is no item at the passed positive index" do
+      lambda { Readline::HISTORY[10] = "test" }.should raise_error(IndexError)
+    end
+
+    it "sets the item at the given index" do
+      Readline::HISTORY[0] = "test"
+      Readline::HISTORY[0].should == "test"
+
+      Readline::HISTORY[1] = "second test"
+      Readline::HISTORY[1].should == "second test"
+    end
+
+    it "raises an IndexError when there is no item at the passed negative index" do
+      lambda { Readline::HISTORY[10] = "test" }.should raise_error(IndexError)
+    end
+  end
+end
diff --git a/spec/rubyspec/library/readline/history/empty_spec.rb b/spec/rubyspec/library/readline/history/empty_spec.rb
new file mode 100644
index 0000000000..92a4fcd063
--- /dev/null
+++ b/spec/rubyspec/library/readline/history/empty_spec.rb
@@ -0,0 +1,13 @@
+require File.expand_path('../../spec_helper', __FILE__)
+
+with_feature :readline do
+  describe "Readline::HISTORY.empty?" do
+    it "returns true when the history is empty" do
+      Readline::HISTORY.should be_empty
+      Readline::HISTORY.push("test")
+      Readline::HISTORY.should_not be_empty
+      Readline::HISTORY.pop
+      Readline::HISTORY.should be_empty
+    end
+  end
+end
diff --git a/spec/rubyspec/library/readline/history/history_spec.rb b/spec/rubyspec/library/readline/history/history_spec.rb
new file mode 100644
index 0000000000..dfa6544036
--- /dev/null
+++ b/spec/rubyspec/library/readline/history/history_spec.rb
@@ -0,0 +1,9 @@
+require File.expand_path('../../spec_helper', __FILE__)
+
+with_feature :readline do
+  describe "Readline::HISTORY" do
+    it "is extended with the Enumerable module" do
+      Readline::HISTORY.should be_kind_of(Enumerable)
+    end
+  end
+end
diff --git a/spec/rubyspec/library/readline/history/length_spec.rb b/spec/rubyspec/library/readline/history/length_spec.rb
new file mode 100644
index 0000000000..6700d4f234
--- /dev/null
+++ b/spec/rubyspec/library/readline/history/length_spec.rb
@@ -0,0 +1,9 @@
+require File.expand_path('../../spec_helper', __FILE__)
+
+with_feature :readline do
+  require File.expand_path('../shared/size', __FILE__)
+
+  describe "Readline::HISTORY.length" do
+    it_behaves_like :readline_history_size, :length
+  end
+end
diff --git a/spec/rubyspec/library/readline/history/pop_spec.rb b/spec/rubyspec/library/readline/history/pop_spec.rb
new file mode 100644
index 0000000000..34562dff3b
--- /dev/null
+++ b/spec/rubyspec/library/readline/history/pop_spec.rb
@@ -0,0 +1,30 @@
+require File.expand_path('../../spec_helper', __FILE__)
+
+with_feature :readline do
+  describe "Readline::HISTORY.pop" do
+    it "returns nil when the history is empty" do
+      Readline::HISTORY.pop.should be_nil
+    end
+
+    it "returns and removes the last item from the history" do
+      Readline::HISTORY.push("1", "2", "3")
+      Readline::HISTORY.size.should == 3
+
+      Readline::HISTORY.pop.should == "3"
+      Readline::HISTORY.size.should == 2
+
+      Readline::HISTORY.pop.should == "2"
+      Readline::HISTORY.size.should == 1
+
+      Readline::HISTORY.pop.should == "1"
+      Readline::HISTORY.size.should == 0
+    end
+
+    it "taints the returned strings" do
+      Readline::HISTORY.push("1", "2", "3")
+      Readline::HISTORY.pop.tainted?.should be_true
+      Readline::HISTORY.pop.tainted?.should be_true
+      Readline::HISTORY.pop.tainted?.should be_true
+    end
+  end
+end
diff --git a/spec/rubyspec/library/readline/history/push_spec.rb b/spec/rubyspec/library/readline/history/push_spec.rb
new file mode 100644
index 0000000000..b59b17ed03
--- /dev/null
+++ b/spec/rubyspec/library/readline/history/push_spec.rb
@@ -0,0 +1,26 @@
+require File.expand_path('../../spec_helper', __FILE__)
+
+with_feature :readline do
+  describe "Readline::HISTORY.push" do
+    it "pushes all passed Objects into the history" do
+      Readline::HISTORY.push("1", "2", "3")
+      Readline::HISTORY.size.should == 3
+
+      Readline::HISTORY.pop.should == "3"
+      Readline::HISTORY.pop.should == "2"
+      Readline::HISTORY.pop.should == "1"
+    end
+
+    it "tries to convert the passed Object to a String using #to_str" do
+      obj = mock("Converted to String")
+      obj.should_receive(:to_str).and_return("converted")
+
+      Readline::HISTORY.push(obj)
+      Readline::HISTORY.pop.should == "converted"
+    end
+
+    it "raises a TypeError when the passed Object can't be converted to a String" do
+      lambda { Readline::HISTORY.push(mock("Object")) }.should raise_error(TypeError)
+    end
+  end
+end
diff --git a/spec/rubyspec/library/readline/history/shared/size.rb b/spec/rubyspec/library/readline/history/shared/size.rb
new file mode 100644
index 0000000000..1d6df86f78
--- /dev/null
+++ b/spec/rubyspec/library/readline/history/shared/size.rb
@@ -0,0 +1,14 @@
+describe :readline_history_size, shared: true do
+  it "returns the size of the history" do
+    Readline::HISTORY.send(@method).should == 0
+    Readline::HISTORY.push("1", "2", "")
+    Readline::HISTORY.send(@method).should == 3
+
+    Readline::HISTORY.pop
+    Readline::HISTORY.send(@method).should == 2
+
+    Readline::HISTORY.pop
+    Readline::HISTORY.pop
+    Readline::HISTORY.send(@method).should == 0
+  end
+end
diff --git a/spec/rubyspec/library/readline/history/shift_spec.rb b/spec/rubyspec/library/readline/history/shift_spec.rb
new file mode 100644
index 0000000000..3d4782998d
--- /dev/null
+++ b/spec/rubyspec/library/readline/history/shift_spec.rb
@@ -0,0 +1,30 @@
+require File.expand_path('../../spec_helper', __FILE__)
+
+with_feature :readline do
+  describe "Readline::HISTORY.shift" do
+    it "returns nil when the history is empty" do
+      Readline::HISTORY.shift.should be_nil
+    end
+
+    it "returns and removes the first item from the history" do
+      Readline::HISTORY.push("1", "2", "3")
+      Readline::HISTORY.size.should == 3
+
+      Readline::HISTORY.shift.should == "1"
+      Readline::HISTORY.size.should == 2
+
+      Readline::HISTORY.shift.should == "2"
+      Readline::HISTORY.size.should == 1
+
+      Readline::HISTORY.shift.should == "3"
+      Readline::HISTORY.size.should == 0
+    end
+
+    it "taints the returned strings" do
+      Readline::HISTORY.push("1", "2", "3")
+      Readline::HISTORY.shift.tainted?.should be_true
+      Readline::HISTORY.shift.tainted?.should be_true
+      Readline::HISTORY.shift.tainted?.should be_true
+    end
+  end
+end
diff --git a/spec/rubyspec/library/readline/history/size_spec.rb b/spec/rubyspec/library/readline/history/size_spec.rb
new file mode 100644
index 0000000000..815c68de27
--- /dev/null
+++ b/spec/rubyspec/library/readline/history/size_spec.rb
@@ -0,0 +1,9 @@
+require File.expand_path('../../spec_helper', __FILE__)
+
+with_feature :readline do
+  require File.expand_path('../shared/size', __FILE__)
+
+  describe "Readline::HISTORY.size" do
+    it_behaves_like :readline_history_size, :size
+  end
+end
diff --git a/spec/rubyspec/library/readline/history/to_s_spec.rb b/spec/rubyspec/library/readline/history/to_s_spec.rb
new file mode 100644
index 0000000000..30ba5a1249
--- /dev/null
+++ b/spec/rubyspec/library/readline/history/to_s_spec.rb
@@ -0,0 +1,9 @@
+require File.expand_path('../../spec_helper', __FILE__)
+
+with_feature :readline do
+  describe "Readline::HISTORY.to_s" do
+    it "returns 'HISTORY'" do
+      Readline::HISTORY.to_s.should == "HISTORY"
+    end
+  end
+end
diff --git a/spec/rubyspec/library/readline/readline_spec.rb b/spec/rubyspec/library/readline/readline_spec.rb
new file mode 100644
index 0000000000..599f84dffd
--- /dev/null
+++ b/spec/rubyspec/library/readline/readline_spec.rb
@@ -0,0 +1,31 @@
+require File.expand_path('../spec_helper', __FILE__)
+
+with_feature :readline do
+  describe "Readline.readline" do
+    before :each do
+      @file = tmp('readline')
+      @out = tmp('out.txt')
+      touch(@file) { |f|
+        f.puts "test"
+      }
+      @options = { options: "-rreadline", args: [@out, "< #{@file}"] }
+    end
+
+    after :each do
+      rm_r @file, @out
+    end
+
+    # Somehow those specs block on Windows
+    platform_is_not :windows do
+      it "returns the input string" do
+        ruby_exe('File.write ARGV[0], Readline.readline', @options)
+        File.read(@out).should == "test"
+      end
+
+      it "taints the returned strings" do
+        ruby_exe('File.write ARGV[0], Readline.readline.tainted?', @options)
+        File.read(@out).should == "true"
+      end
+    end
+  end
+end
diff --git a/spec/rubyspec/library/readline/spec_helper.rb b/spec/rubyspec/library/readline/spec_helper.rb
new file mode 100644
index 0000000000..b5ac16d22a
--- /dev/null
+++ b/spec/rubyspec/library/readline/spec_helper.rb
@@ -0,0 +1,13 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+unless MSpec.retrieve(:features).key?(:readline)
+  begin
+    require 'readline'
+  rescue LoadError
+  else
+    # rb-readline behaves quite differently
+    if $".grep(/\brbreadline\.rb$/).empty?
+      MSpec.enable_feature :readline
+    end
+  end
+end
diff --git a/spec/rubyspec/library/readline/vi_editing_mode_spec.rb b/spec/rubyspec/library/readline/vi_editing_mode_spec.rb
new file mode 100644
index 0000000000..db6d4387f8
--- /dev/null
+++ b/spec/rubyspec/library/readline/vi_editing_mode_spec.rb
@@ -0,0 +1,11 @@
+require File.expand_path('../spec_helper', __FILE__)
+
+platform_is_not :darwin do
+  with_feature :readline do
+    describe "Readline.vi_editing_mode" do
+      it "returns nil" do
+        Readline.vi_editing_mode.should be_nil
+      end
+    end
+  end
+end