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, 63 insertions, 0 deletions

diff --git a/spec/rubyspec/core/array/values_at_spec.rb b/spec/rubyspec/core/array/values_at_spec.rb
new file mode 100644
index 0000000000..f36356f0d3
--- /dev/null
+++ b/spec/rubyspec/core/array/values_at_spec.rb
@@ -0,0 +1,63 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../fixtures/classes', __FILE__)
+
+describe "Array#values_at" do
+  it "returns an array of elements at the indexes when passed indexes" do
+    [1, 2, 3, 4, 5].values_at().should == []
+    [1, 2, 3, 4, 5].values_at(1, 0, 5, -1, -8, 10).should == [2, 1, nil, 5, nil, nil]
+  end
+
+  it "calls to_int on its indices" do
+    obj = mock('1')
+    def obj.to_int() 1 end
+    [1, 2].values_at(obj, obj, obj).should == [2, 2, 2]
+  end
+
+  it "properly handles recursive arrays" do
+    empty = ArraySpecs.empty_recursive_array
+    empty.values_at(0, 1, 2).should == [empty, nil, nil]
+
+    array = ArraySpecs.recursive_array
+    array.values_at(0, 1, 2, 3).should == [1, 'two', 3.0, array]
+  end
+
+  describe "when passed ranges" do
+    it "returns an array of elements in the ranges" do
+      [1, 2, 3, 4, 5].values_at(0..2, 1...3, 2..-2).should == [1, 2, 3, 2, 3, 3, 4]
+      [1, 2, 3, 4, 5].values_at(6..4).should == []
+    end
+
+    it "calls to_int on arguments of ranges" do
+      from = mock('from')
+      to = mock('to')
+
+      # So we can construct a range out of them...
+      def from.<=>(o) 0 end
+      def to.<=>(o) 0 end
+
+      def from.to_int() 1 end
+      def to.to_int() -2 end
+
+      ary = [1, 2, 3, 4, 5]
+      ary.values_at(from .. to, from ... to, to .. from).should == [2, 3, 4, 2, 3]
+    end
+  end
+
+  describe "when passed a range" do
+    it "fills with nil if the index is out of the range" do
+      [0, 1].values_at(0..3).should == [0, 1, nil, nil]
+      [0, 1].values_at(2..4).should == [nil, nil, nil]
+    end
+
+    describe "on an empty array" do
+      it "fills with nils if the index is out of the range" do
+        [].values_at(0..2).should == [nil, nil, nil]
+        [].values_at(1..3).should == [nil, nil, nil]
+      end
+    end
+  end
+
+  it "does not return subclass instance on Array subclasses" do
+    ArraySpecs::MyArray[1, 2, 3].values_at(0, 1..2, 1).should be_an_instance_of(Array)
+  end
+end