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

spec/rubyspec/library/zlib/gzipreader/getc_spec.rb

@@ -0,0 +1,41 @@
+require File.expand_path('../../../../spec_helper', __FILE__)
+require 'stringio'
+require 'zlib'
+
+describe "GzipReader#getc" do
+
+  before :each do
+    @data = '12345abcde'
+    @zip = [31, 139, 8, 0, 44, 220, 209, 71, 0, 3, 51, 52, 50, 54, 49, 77,
+            76, 74, 78, 73, 5, 0, 157, 5, 0, 36, 10, 0, 0, 0].pack('C*')
+    @io = StringIO.new @zip
+  end
+
+  it "returns the next character from the stream" do
+    gz = Zlib::GzipReader.new @io
+    gz.pos.should == 0
+
+    gz.getc.should == '1'
+    gz.getc.should == '2'
+    gz.getc.should == '3'
+    gz.getc.should == '4'
+    gz.getc.should == '5'
+  end
+
+  it "increments position" do
+    gz = Zlib::GzipReader.new @io
+    (0..@data.size).each do |i|
+      gz.pos.should == i
+      gz.getc
+    end
+  end
+
+  it "returns nil at the end of the stream" do
+    gz = Zlib::GzipReader.new @io
+    gz.read
+    pos = gz.pos
+    gz.getc.should be_nil
+    gz.pos.should == pos
+  end
+
+end