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, 58 insertions, 0 deletions

diff --git a/spec/rubyspec/core/string/new_spec.rb b/spec/rubyspec/core/string/new_spec.rb
new file mode 100644
index 0000000000..0a246f6f53
--- /dev/null
+++ b/spec/rubyspec/core/string/new_spec.rb
@@ -0,0 +1,58 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../fixtures/classes', __FILE__)
+
+describe "String.new" do
+  it "returns an instance of String" do
+    str = String.new
+    str.should be_an_instance_of(String)
+  end
+
+  ruby_version_is "2.3" do
+    it "accepts an encoding argument" do
+      xA4xA2 = [0xA4, 0xA2].pack('CC').force_encoding 'utf-8'
+      str = String.new(xA4xA2, encoding: 'euc-jp')
+      str.encoding.should == Encoding::EUC_JP
+    end
+  end
+
+  it "returns a fully-formed String" do
+    str = String.new
+    str.size.should == 0
+    str << "more"
+    str.should == "more"
+  end
+
+  it "returns a new string given a string argument" do
+    str1 = "test"
+    str = String.new(str1)
+    str.should be_an_instance_of(String)
+    str.should == str1
+    str << "more"
+    str.should == "testmore"
+  end
+
+  it "returns an instance of a subclass" do
+    a = StringSpecs::MyString.new("blah")
+    a.should be_an_instance_of(StringSpecs::MyString)
+    a.should == "blah"
+  end
+
+  it "is called on subclasses" do
+    s = StringSpecs::SubString.new
+    s.special.should == nil
+    s.should == ""
+
+    s = StringSpecs::SubString.new "subclass"
+    s.special.should == "subclass"
+    s.should == ""
+  end
+
+  it "raises TypeError on inconvertible object" do
+    lambda { String.new 5 }.should raise_error(TypeError)
+    lambda { String.new nil }.should raise_error(TypeError)
+  end
+
+  it "returns a binary String" do
+    String.new.encoding.should == Encoding::BINARY
+  end
+end