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, 36 insertions, 0 deletions

diff --git a/spec/rubyspec/library/stringio/close_read_spec.rb b/spec/rubyspec/library/stringio/close_read_spec.rb
new file mode 100644
index 0000000000..59e16385d2
--- /dev/null
+++ b/spec/rubyspec/library/stringio/close_read_spec.rb
@@ -0,0 +1,36 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../fixtures/classes', __FILE__)
+
+describe "StringIO#close_read" do
+  before :each do
+    @io = StringIO.new("example")
+  end
+
+  it "returns nil" do
+    @io.close_read.should be_nil
+  end
+
+  it "prevents further reading" do
+    @io.close_read
+    lambda { @io.read(1) }.should raise_error(IOError)
+  end
+
+  it "allows further writing" do
+    @io.close_read
+    @io.write("x").should == 1
+  end
+
+  it "raises an IOError when in write-only mode" do
+    io = StringIO.new("example", "w")
+    lambda { io.close_read }.should raise_error(IOError)
+
+    io = StringIO.new("example")
+    io.close_read
+    ruby_version_is ''...'2.3' do
+      lambda { io.close_read }.should raise_error(IOError)
+    end
+    ruby_version_is '2.3' do
+      io.close_read.should == nil
+    end
+  end
+end