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, 66 insertions, 0 deletions

diff --git a/spec/rubyspec/language/redo_spec.rb b/spec/rubyspec/language/redo_spec.rb
new file mode 100644
index 0000000000..53fd30b4f2
--- /dev/null
+++ b/spec/rubyspec/language/redo_spec.rb
@@ -0,0 +1,66 @@
+require File.expand_path('../../spec_helper', __FILE__)
+
+describe "The redo statement" do
+  it "restarts block execution if used within block" do
+    a = []
+    lambda {
+      a << 1
+      redo if a.size < 2
+      a << 2
+    }.call
+    a.should == [1, 1, 2]
+  end
+
+  it "re-executes the closest loop" do
+    exist = [2,3]
+    processed = []
+    order = []
+    [1,2,3,4].each do |x|
+      order << x
+      begin
+        processed << x
+        if exist.include?(x)
+          raise StandardError, "included"
+        end
+      rescue StandardError
+        exist.delete(x)
+        redo
+      end
+    end
+    processed.should == [1,2,2,3,3,4]
+    exist.should == []
+    order.should == [1,2,2,3,3,4]
+  end
+
+  it "re-executes the last step in enumeration" do
+    list = []
+    [1,2,3].each do |x|
+      list << x
+      break if list.size == 6
+      redo if x == 3
+    end
+    list.should == [1,2,3,3,3,3]
+  end
+
+  it "triggers ensure block when re-executing a block" do
+    list = []
+    [1,2,3].each do |x|
+      list << x
+      begin
+        list << 10*x
+        redo if list.count(1) == 1
+      ensure
+        list << 100*x
+      end
+    end
+    list.should == [1,10,100,1,10,100,2,20,200,3,30,300]
+  end
+
+  describe "in a method" do
+    it "is invalid and raises a SyntaxError" do
+      lambda {
+        eval("def m; redo; end")
+      }.should raise_error(SyntaxError)
+    end
+  end
+end