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/core/string/upto_spec.rb

@@ -0,0 +1,98 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../fixtures/classes.rb', __FILE__)
+
+describe "String#upto" do
+  it "passes successive values, starting at self and ending at other_string, to the block" do
+    a = []
+    "*+".upto("*3") { |s| a << s }
+    a.should == ["*+", "*,", "*-", "*.", "*/", "*0", "*1", "*2", "*3"]
+  end
+
+  it "calls the block once even when start eqals stop" do
+    a = []
+    "abc".upto("abc") { |s| a << s }
+    a.should == ["abc"]
+  end
+
+  it "doesn't call block with self even if self is less than stop but stop length is less than self length" do
+    a = []
+    "25".upto("5") { |s| a << s }
+    a.should == []
+  end
+
+  it "doesn't call block if stop is less than self and stop length is less than self length" do
+    a = []
+    "25".upto("1") { |s| a << s }
+    a.should == []
+  end
+
+  it "doesn't call the block if self is greater than stop" do
+    a = []
+    "5".upto("2") { |s| a << s }
+    a.should == []
+  end
+
+  it "stops iterating as soon as the current value's character count gets higher than stop's" do
+    a = []
+    "96".upto("AA") { |s| a << s }
+    a.should == ["96", "97", "98", "99"]
+  end
+
+  it "returns self" do
+    "abc".upto("abd") { }.should == "abc"
+    "5".upto("2") { |i| i }.should == "5"
+  end
+
+  it "tries to convert other to string using to_str" do
+    other = mock('abd')
+    def other.to_str() "abd" end
+
+    a = []
+    "abc".upto(other) { |s| a << s }
+    a.should == ["abc", "abd"]
+  end
+
+  it "raises a TypeError if other can't be converted to a string" do
+    lambda { "abc".upto(123) { }      }.should raise_error(TypeError)
+    lambda { "abc".upto(mock('x')){ } }.should raise_error(TypeError)
+  end
+
+
+  it "does not work with symbols" do
+    lambda { "a".upto(:c).to_a }.should raise_error(TypeError)
+  end
+
+  it "returns non-alphabetic characters in the ASCII range for single letters" do
+    "9".upto("A").to_a.should == ["9", ":", ";", "<", "=", ">", "?", "@", "A"]
+    "Z".upto("a").to_a.should == ["Z", "[", "\\", "]", "^", "_", "`", "a"]
+    "z".upto("~").to_a.should == ["z", "{", "|", "}", "~"]
+  end
+
+  it "stops before the last value if exclusive" do
+    a = []
+    "a".upto("d", true) { |s| a << s}
+    a.should == ["a", "b", "c"]
+  end
+
+  describe "on sequence of numbers" do
+    it "calls the block as Integer#upto"  do
+      "8".upto("11").to_a.should == 8.upto(11).map(&:to_s)
+    end
+  end
+
+  describe "when no block is given" do
+    it "returns an enumerator" do
+      enum = "aaa".upto("baa", true)
+      enum.should be_an_instance_of(Enumerator)
+      enum.count.should == 26**2
+    end
+
+    describe "returned Enumerator" do
+      describe "size" do
+        it "should return nil" do
+          "a".upto("b").size.should == nil
+        end
+      end
+    end
+  end
+end