14 files changed, 387 insertions, 111 deletions

diff --git a/spec/ruby/core/struct/constants_spec.rb b/spec/ruby/core/struct/constants_spec.rb
new file mode 100644
index 0000000000..7e8af1a211
--- /dev/null
+++ b/spec/ruby/core/struct/constants_spec.rb
@@ -0,0 +1,13 @@
+require_relative '../../spec_helper'
+
+describe "Struct::Group" do
+  it "is no longer defined" do
+    Struct.should_not.const_defined?(:Group)
+  end
+end
+
+describe "Struct::Passwd" do
+  it "is no longer defined" do
+    Struct.should_not.const_defined?(:Passwd)
+  end
+end
diff --git a/spec/ruby/core/struct/deconstruct_keys_spec.rb b/spec/ruby/core/struct/deconstruct_keys_spec.rb
index f0a1f50ad3..e16b50f930 100644
--- a/spec/ruby/core/struct/deconstruct_keys_spec.rb
+++ b/spec/ruby/core/struct/deconstruct_keys_spec.rb
@@ -1,78 +1,130 @@
 require_relative '../../spec_helper'
 
-ruby_version_is "2.7" do
-  describe "Struct#deconstruct_keys" do
-    it "returns a hash of attributes" do
-      struct = Struct.new(:x, :y)
-      s = struct.new(1, 2)
-
-      s.deconstruct_keys([:x, :y]).should == {x: 1, y: 2}
-    end
-
-    it "requires one argument" do
-      struct = Struct.new(:x)
-      obj = struct.new(1)
-
-      -> {
-        obj.deconstruct_keys
-      }.should raise_error(ArgumentError, /wrong number of arguments \(given 0, expected 1\)/)
-    end
-
-    it "returns only specified keys" do
-      struct = Struct.new(:x, :y, :z)
-      s = struct.new(1, 2, 3)
-
-      s.deconstruct_keys([:x, :y]).should == {x: 1, y: 2}
-      s.deconstruct_keys([:x]    ).should == {x: 1}
-      s.deconstruct_keys([]      ).should == {}
-    end
-
-    it "accepts string attribute names" do
-      struct = Struct.new(:x, :y)
-      s = struct.new(1, 2)
-
-      s.deconstruct_keys(['x', 'y']).should == {'x' => 1, 'y' => 2}
-    end
-
-    it "accepts argument position number as well but returns them as keys" do
-      struct = Struct.new(:x, :y, :z)
-      s = struct.new(10, 20, 30)
-
-      s.deconstruct_keys([0, 1, 2]).should == {0 => 10, 1 => 20, 2 => 30}
-      s.deconstruct_keys([0, 1]   ).should == {0 => 10, 1 => 20}
-      s.deconstruct_keys([0]      ).should == {0 => 10}
-    end
-
-    it "returns an empty hash when there are more keys than attributes" do
-      struct = Struct.new(:x, :y)
-      s = struct.new(1, 2)
-
-      s.deconstruct_keys([:x, :y, :a]).should == {}
-    end
-
-    it "returns at first not existing attribute name" do
-      struct = Struct.new(:x, :y)
-      s = struct.new(1, 2)
-
-      s.deconstruct_keys([:a, :x]).should == {}
-      s.deconstruct_keys([:x, :a]).should == {x: 1}
-    end
-
-    it "accepts nil argument and return all the attributes" do
-      struct = Struct.new(:x, :y)
-      obj = struct.new(1, 2)
-
-      obj.deconstruct_keys(nil).should == {x: 1, y: 2}
-    end
-
-    it "raise TypeError if passed anything accept nil or array" do
-      struct = Struct.new(:x, :y)
-      s = struct.new(1, 2)
-
-      -> { s.deconstruct_keys('x') }.should raise_error(TypeError, /expected Array or nil/)
-      -> { s.deconstruct_keys(1)   }.should raise_error(TypeError, /expected Array or nil/)
-      -> { s.deconstruct_keys(:x)  }.should raise_error(TypeError, /expected Array or nil/)
-      -> { s.deconstruct_keys({})  }.should raise_error(TypeError, /expected Array or nil/)
-    end
+describe "Struct#deconstruct_keys" do
+  it "returns a hash of attributes" do
+    struct = Struct.new(:x, :y)
+    s = struct.new(1, 2)
+
+    s.deconstruct_keys([:x, :y]).should == {x: 1, y: 2}
+  end
+
+  it "requires one argument" do
+    struct = Struct.new(:x)
+    obj = struct.new(1)
+
+    -> {
+      obj.deconstruct_keys
+    }.should raise_error(ArgumentError, /wrong number of arguments \(given 0, expected 1\)/)
+  end
+
+  it "returns only specified keys" do
+    struct = Struct.new(:x, :y, :z)
+    s = struct.new(1, 2, 3)
+
+    s.deconstruct_keys([:x, :y]).should == {x: 1, y: 2}
+    s.deconstruct_keys([:x]    ).should == {x: 1}
+    s.deconstruct_keys([]      ).should == {}
+  end
+
+  it "accepts string attribute names" do
+    struct = Struct.new(:x, :y)
+    s = struct.new(1, 2)
+
+    s.deconstruct_keys(['x', 'y']).should == {'x' => 1, 'y' => 2}
+  end
+
+  it "accepts argument position number as well but returns them as keys" do
+    struct = Struct.new(:x, :y, :z)
+    s = struct.new(10, 20, 30)
+
+    s.deconstruct_keys([0, 1, 2]).should == {0 => 10, 1 => 20, 2 => 30}
+    s.deconstruct_keys([0, 1]   ).should == {0 => 10, 1 => 20}
+    s.deconstruct_keys([0]      ).should == {0 => 10}
+    s.deconstruct_keys([-1]     ).should == {-1 => 30}
+  end
+
+  it "ignores incorrect position numbers" do
+    struct = Struct.new(:x, :y, :z)
+    s = struct.new(10, 20, 30)
+
+    s.deconstruct_keys([0, 3]).should == {0 => 10}
+  end
+
+  it "support mixing attribute names and argument position numbers" do
+    struct = Struct.new(:x, :y)
+    s = struct.new(1, 2)
+
+    s.deconstruct_keys([0, :x]).should == {0 => 1, :x => 1}
+  end
+
+  it "returns an empty hash when there are more keys than attributes" do
+    struct = Struct.new(:x, :y)
+    s = struct.new(1, 2)
+
+    s.deconstruct_keys([:x, :y, :a]).should == {}
+  end
+
+  it "returns at first not existing attribute name" do
+    struct = Struct.new(:x, :y)
+    s = struct.new(1, 2)
+
+    s.deconstruct_keys([:a, :x]).should == {}
+    s.deconstruct_keys([:x, :a]).should == {x: 1}
+  end
+
+  it "returns at first not existing argument position number" do
+    struct = Struct.new(:x, :y)
+    s = struct.new(1, 2)
+
+    s.deconstruct_keys([3, 0]).should == {}
+    s.deconstruct_keys([0, 3]).should == {0 => 1}
+  end
+
+  it "accepts nil argument and return all the attributes" do
+    struct = Struct.new(:x, :y)
+    obj = struct.new(1, 2)
+
+    obj.deconstruct_keys(nil).should == {x: 1, y: 2}
+  end
+
+  it "tries to convert a key with #to_int if index is not a String nor a Symbol, but responds to #to_int" do
+    struct = Struct.new(:x, :y)
+    s = struct.new(1, 2)
+
+    key = mock("to_int")
+    key.should_receive(:to_int).and_return(1)
+
+    s.deconstruct_keys([key]).should == { key => 2 }
+  end
+
+  it "raises a TypeError if the conversion with #to_int does not return an Integer" do
+    struct = Struct.new(:x, :y)
+    s = struct.new(1, 2)
+
+    key = mock("to_int")
+    key.should_receive(:to_int).and_return("not an Integer")
+
+    -> {
+      s.deconstruct_keys([key])
+    }.should raise_error(TypeError, /can't convert MockObject to Integer/)
+  end
+
+  it "raises TypeError if index is not a String, a Symbol and not convertible to Integer" do
+    struct = Struct.new(:x, :y)
+    s = struct.new(1, 2)
+
+    -> {
+      s.deconstruct_keys([0, []])
+    }.should raise_error(TypeError, "no implicit conversion of Array into Integer")
+  end
+
+  it "raise TypeError if passed anything except nil or array" do
+    struct = Struct.new(:x, :y)
+    s = struct.new(1, 2)
+
+    -> { s.deconstruct_keys('x') }.should raise_error(TypeError, /expected Array or nil/)
+    -> { s.deconstruct_keys(1)   }.should raise_error(TypeError, /expected Array or nil/)
+    -> { s.deconstruct_keys(:x)  }.should raise_error(TypeError, /expected Array or nil/)
+    -> { s.deconstruct_keys({})  }.should raise_error(TypeError, /expected Array or nil/)
   end
 end
diff --git a/spec/ruby/core/struct/deconstruct_spec.rb b/spec/ruby/core/struct/deconstruct_spec.rb
index 7518a40987..32d4f6bac4 100644
--- a/spec/ruby/core/struct/deconstruct_spec.rb
+++ b/spec/ruby/core/struct/deconstruct_spec.rb
@@ -1,12 +1,10 @@
 require_relative '../../spec_helper'
 
-ruby_version_is "2.7" do
-  describe "Struct#deconstruct" do
-    it "returns an array of attribute values" do
-      struct = Struct.new(:x, :y)
-      s = struct.new(1, 2)
+describe "Struct#deconstruct" do
+  it "returns an array of attribute values" do
+    struct = Struct.new(:x, :y)
+    s = struct.new(1, 2)
 
-      s.deconstruct.should == [1, 2]
-    end
+    s.deconstruct.should == [1, 2]
   end
 end
diff --git a/spec/ruby/core/struct/element_set_spec.rb b/spec/ruby/core/struct/element_set_spec.rb
index 6ba7b081a9..0a0e34a5ee 100644
--- a/spec/ruby/core/struct/element_set_spec.rb
+++ b/spec/ruby/core/struct/element_set_spec.rb
@@ -26,4 +26,11 @@ describe "Struct#[]=" do
     -> { car[-4] = true         }.should raise_error(IndexError)
     -> { car[Object.new] = true }.should raise_error(TypeError)
   end
+
+  it "raises a FrozenError on a frozen struct" do
+    car = StructClasses::Car.new('Ford', 'Ranger')
+    car.freeze
+
+    -> { car[:model] = 'Escape' }.should raise_error(FrozenError)
+  end
 end
diff --git a/spec/ruby/core/struct/fixtures/classes.rb b/spec/ruby/core/struct/fixtures/classes.rb
index 6d620f9060..7b80b814ef 100644
--- a/spec/ruby/core/struct/fixtures/classes.rb
+++ b/spec/ruby/core/struct/fixtures/classes.rb
@@ -13,6 +13,12 @@ module StructClasses
     end
   end
 
+  class StructWithOverriddenName < Struct.new(:a)
+    def self.name
+      "A"
+    end
+  end
+
   class SubclassX < Struct
   end
 
@@ -23,4 +29,6 @@ module StructClasses
       super
     end
   end
+
+  class StructSubclass < Struct; end
 end
diff --git a/spec/ruby/core/struct/initialize_spec.rb b/spec/ruby/core/struct/initialize_spec.rb
index e82289071a..06055594d5 100644
--- a/spec/ruby/core/struct/initialize_spec.rb
+++ b/spec/ruby/core/struct/initialize_spec.rb
@@ -40,4 +40,12 @@ describe "Struct#initialize" do
   it "can be overridden" do
     StructClasses::SubclassX.new(:y).new.key.should == :value
   end
+
+  it "can be initialized with keyword arguments" do
+    positional_args = StructClasses::Ruby.new("3.2", "OS")
+    keyword_args = StructClasses::Ruby.new(version: "3.2", platform: "OS")
+
+    positional_args.version.should == keyword_args.version
+    positional_args.platform.should == keyword_args.platform
+  end
 end
diff --git a/spec/ruby/core/struct/inspect_spec.rb b/spec/ruby/core/struct/inspect_spec.rb
index 83e13597ba..657b06abc1 100644
--- a/spec/ruby/core/struct/inspect_spec.rb
+++ b/spec/ruby/core/struct/inspect_spec.rb
@@ -3,10 +3,5 @@ require_relative 'fixtures/classes'
 require_relative 'shared/inspect'
 
 describe "Struct#inspect" do
-  it "returns a string representation showing members and values" do
-    car = StructClasses::Car.new('Ford', 'Ranger')
-    car.inspect.should == '#<struct StructClasses::Car make="Ford", model="Ranger", year=nil>'
-  end
-
   it_behaves_like :struct_inspect, :inspect
 end
diff --git a/spec/ruby/core/struct/keyword_init_spec.rb b/spec/ruby/core/struct/keyword_init_spec.rb
new file mode 100644
index 0000000000..536b82041a
--- /dev/null
+++ b/spec/ruby/core/struct/keyword_init_spec.rb
@@ -0,0 +1,45 @@
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+
+# See https://bugs.ruby-lang.org/issues/18008
+describe "StructClass#keyword_init?" do
+  it "returns true for a struct that accepts keyword arguments to initialize" do
+    struct = Struct.new(:arg, keyword_init: true)
+    struct.keyword_init?.should be_true
+  end
+
+  it "returns false for a struct that does not accept keyword arguments to initialize" do
+    struct = Struct.new(:arg, keyword_init: false)
+    struct.keyword_init?.should be_false
+  end
+
+  it "returns nil for a struct that did not explicitly specify keyword_init" do
+    struct = Struct.new(:arg)
+    struct.keyword_init?.should be_nil
+  end
+
+  it "returns nil for a struct that does specify keyword_init to be nil" do
+    struct = Struct.new(:arg, keyword_init: nil)
+    struct.keyword_init?.should be_nil
+  end
+
+  it "returns true for any truthy value, not just for true" do
+    struct = Struct.new(:arg, keyword_init: 1)
+    struct.keyword_init?.should be_true
+
+    struct = Struct.new(:arg, keyword_init: "")
+    struct.keyword_init?.should be_true
+
+    struct = Struct.new(:arg, keyword_init: [])
+    struct.keyword_init?.should be_true
+
+    struct = Struct.new(:arg, keyword_init: {})
+    struct.keyword_init?.should be_true
+  end
+
+  context "class inheriting Struct" do
+    it "isn't available in a subclass" do
+      StructClasses::StructSubclass.should_not.respond_to?(:keyword_init?)
+    end
+  end
+end
diff --git a/spec/ruby/core/struct/members_spec.rb b/spec/ruby/core/struct/members_spec.rb
index 1f2ff950d9..1ff7b9387a 100644
--- a/spec/ruby/core/struct/members_spec.rb
+++ b/spec/ruby/core/struct/members_spec.rb
@@ -11,3 +11,15 @@ describe "Struct#members" do
 
   it_behaves_like :struct_accessor, :members
 end
+
+describe "StructClass#members" do
+  it "returns an array of attribute names" do
+    StructClasses::Car.members.should == [:make, :model, :year]
+  end
+
+  context "class inheriting Struct" do
+    it "isn't available in a subclass" do
+      StructClasses::StructSubclass.should_not.respond_to?(:members)
+    end
+  end
+end
diff --git a/spec/ruby/core/struct/new_spec.rb b/spec/ruby/core/struct/new_spec.rb
index cbbec829d7..1d35de7b87 100644
--- a/spec/ruby/core/struct/new_spec.rb
+++ b/spec/ruby/core/struct/new_spec.rb
@@ -6,6 +6,8 @@ describe "Struct.new" do
     struct = Struct.new('Animal', :name, :legs, :eyeballs)
     struct.should == Struct::Animal
     struct.name.should == "Struct::Animal"
+  ensure
+    Struct.send(:remove_const, :Animal)
   end
 
   it "overwrites previously defined constants with string as first argument" do
@@ -19,6 +21,8 @@ describe "Struct.new" do
     second.should == Struct::Person
 
     first.members.should_not == second.members
+  ensure
+    Struct.send(:remove_const, :Person)
   end
 
   it "calls to_str on its first argument (constant name)" do
@@ -27,6 +31,8 @@ describe "Struct.new" do
     struct = Struct.new(obj)
     struct.should == Struct::Foo
     struct.name.should == "Struct::Foo"
+  ensure
+    Struct.send(:remove_const, :Foo)
   end
 
   it "creates a new anonymous class with nil first argument" do
@@ -47,6 +53,11 @@ describe "Struct.new" do
     Struct.const_defined?("Animal2").should be_false
   end
 
+  it "allows non-ASCII member name" do
+    name = "r\xe9sum\xe9".dup.force_encoding(Encoding::ISO_8859_1).to_sym
+    struct = Struct.new(name)
+    struct.new("foo").send(name).should == "foo"
+  end
 
   it "fails with invalid constant name as first argument" do
     -> { Struct.new('animal', :name, :legs, :eyeballs) }.should raise_error(NameError)
@@ -62,8 +73,22 @@ describe "Struct.new" do
     -> { Struct.new(:animal, ['chris', 'evan'])    }.should raise_error(TypeError)
   end
 
-  it "raises a ArgumentError if passed a Hash with an unknown key" do
-    -> { Struct.new(:animal, { name: 'chris' }) }.should raise_error(ArgumentError)
+  it "raises a TypeError if passed a Hash with an unknown key" do
+    -> { Struct.new(:animal, { name: 'chris' }) }.should raise_error(TypeError)
+  end
+
+  ruby_version_is ""..."3.3" do
+    it "raises ArgumentError if not provided any arguments" do
+      -> { Struct.new }.should raise_error(ArgumentError)
+    end
+  end
+
+  ruby_version_is "3.3" do
+    it "works when not provided any arguments" do
+      c = Struct.new
+      c.should be_kind_of(Class)
+      c.superclass.should == Struct
+    end
   end
 
   it "raises ArgumentError when there is a duplicate member" do
@@ -107,6 +132,8 @@ describe "Struct.new" do
     it "creates a constant in subclass' namespace" do
       struct = StructClasses::Apple.new('Computer', :size)
       struct.should == StructClasses::Apple::Computer
+    ensure
+      StructClasses::Apple.send(:remove_const, :Computer)
     end
 
     it "creates an instance" do
@@ -127,29 +154,43 @@ describe "Struct.new" do
       -> { StructClasses::Ruby.new('2.0', 'i686', true) }.should raise_error(ArgumentError)
     end
 
-    ruby_version_is ''...'3.1' do
-      it "passes a hash as a normal argument" do
-        type = Struct.new(:args)
+    it "accepts keyword arguments to initialize" do
+      type = Struct.new(:args)
 
-        obj = suppress_warning {type.new(keyword: :arg)}
-        obj2 = type.new(*[{keyword: :arg}])
+      obj = type.new(args: 42)
+      obj2 = type.new(42)
 
-        obj.should == obj2
-        obj.args.should == {keyword: :arg}
-        obj2.args.should == {keyword: :arg}
-      end
+      obj.should == obj2
+      obj.args.should == 42
+      obj2.args.should == 42
     end
 
-    ruby_version_is '3.2' do
-      it "accepts keyword arguments to initialize" do
-        type = Struct.new(:args)
+    context "given positional and keyword arguments" do
+      it "treats keyword arguments as a positional parameter" do
+        type = Struct.new(:a, :b)
+        s = type.new("a", b: "b")
+        s.a.should == "a"
+        s.b.should == {b: "b"}
+
+        type = Struct.new(:a, :b, :c)
+        s = type.new("a", b: "b", c: "c")
+        s.a.should == "a"
+        s.b.should == {b: "b", c: "c"}
+        s.c.should == nil
+      end
 
-        obj = type.new(args: 42)
-        obj2 = type.new(42)
+      it "ignores empty keyword arguments" do
+        type = Struct.new(:a, :b)
+        h = {}
+        s = type.new("a", **h)
+
+        s.a.should == "a"
+        s.b.should == nil
+      end
 
-        obj.should == obj2
-        obj.args.should == 42
-        obj2.args.should == 42
+      it "raises ArgumentError when all struct attribute values are specified" do
+        type = Struct.new(:a, :b)
+        -> { type.new("a", "b", c: "c") }.should raise_error(ArgumentError, "struct size differs")
       end
     end
   end
diff --git a/spec/ruby/core/struct/shared/inspect.rb b/spec/ruby/core/struct/shared/inspect.rb
index 90594a5452..1a0fb6a6b2 100644
--- a/spec/ruby/core/struct/shared/inspect.rb
+++ b/spec/ruby/core/struct/shared/inspect.rb
@@ -1,5 +1,40 @@
 describe :struct_inspect, shared: true do
+  it "returns a string representation showing members and values" do
+    car = StructClasses::Car.new('Ford', 'Ranger')
+    car.send(@method).should == '#<struct StructClasses::Car make="Ford", model="Ranger", year=nil>'
+  end
+
   it "returns a string representation without the class name for anonymous structs" do
     Struct.new(:a).new("").send(@method).should == '#<struct a="">'
   end
+
+  it "returns a string representation without the class name for structs nested in anonymous classes" do
+    c = Class.new
+    c.class_eval <<~DOC
+      class Foo < Struct.new(:a); end
+    DOC
+
+    c::Foo.new("").send(@method).should == '#<struct a="">'
+  end
+
+  it "returns a string representation without the class name for structs nested in anonymous modules" do
+    m = Module.new
+    m.module_eval <<~DOC
+      class Foo < Struct.new(:a); end
+    DOC
+
+    m::Foo.new("").send(@method).should == '#<struct a="">'
+  end
+
+  it "does not call #name method" do
+    struct = StructClasses::StructWithOverriddenName.new("")
+    struct.send(@method).should == '#<struct StructClasses::StructWithOverriddenName a="">'
+  end
+
+  it "does not call #name method when struct is anonymous" do
+    struct = Struct.new(:a)
+    def struct.name; "A"; end
+
+    struct.new("").send(@method).should == '#<struct a="">'
+  end
 end
diff --git a/spec/ruby/core/struct/struct_spec.rb b/spec/ruby/core/struct/struct_spec.rb
index 8817dc1a58..1b6a4488ce 100644
--- a/spec/ruby/core/struct/struct_spec.rb
+++ b/spec/ruby/core/struct/struct_spec.rb
@@ -33,6 +33,13 @@ describe "Struct anonymous class instance methods" do
     car['model'].should == 'F150'
     car[1].should == 'F150'
   end
+
+  it "writer methods raise a FrozenError on a frozen struct" do
+    car = StructClasses::Car.new('Ford', 'Ranger')
+    car.freeze
+
+    -> { car.model = 'Escape' }.should raise_error(FrozenError)
+  end
 end
 
 describe "Struct subclasses" do
diff --git a/spec/ruby/core/struct/to_h_spec.rb b/spec/ruby/core/struct/to_h_spec.rb
index bfb0af07ba..861ce3f49d 100644
--- a/spec/ruby/core/struct/to_h_spec.rb
+++ b/spec/ruby/core/struct/to_h_spec.rb
@@ -21,6 +21,18 @@ describe "Struct#to_h" do
       h.should == { "make" => "ford", "model" => "ranger", "year" => "" }
     end
 
+    it "passes to a block each pair's key and value as separate arguments" do
+      s = StructClasses::Ruby.new('3.2.4', 'macos')
+
+      ScratchPad.record []
+      s.to_h { |k, v| ScratchPad << [k, v]; [k, v] }
+      ScratchPad.recorded.sort.should == [[:platform, 'macos'], [:version, '3.2.4']]
+
+      ScratchPad.record []
+      s.to_h { |*args| ScratchPad << args; [args[0], args[1]] }
+      ScratchPad.recorded.sort.should == [[:platform, 'macos'], [:version, '3.2.4']]
+    end
+
     it "raises ArgumentError if block returns longer or shorter array" do
       -> do
         StructClasses::Car.new.to_h { |k, v| [k.to_s, "#{v}".downcase, 1] }
diff --git a/spec/ruby/core/struct/values_at_spec.rb b/spec/ruby/core/struct/values_at_spec.rb
index 7e517cdb4b..5e5a496600 100644
--- a/spec/ruby/core/struct/values_at_spec.rb
+++ b/spec/ruby/core/struct/values_at_spec.rb
@@ -1,16 +1,59 @@
 require_relative '../../spec_helper'
 require_relative 'fixtures/classes'
 
+# Should be synchronized with core/array/values_at_spec.rb
 describe "Struct#values_at" do
-  it "returns an array of values" do
+  before do
     clazz = Struct.new(:name, :director, :year)
-    movie = clazz.new('Sympathy for Mr. Vengence', 'Chan-wook Park', 2002)
-    movie.values_at(0, 1).should == ['Sympathy for Mr. Vengence', 'Chan-wook Park']
-    movie.values_at(0..2).should == ['Sympathy for Mr. Vengence', 'Chan-wook Park', 2002]
+    @movie = clazz.new('Sympathy for Mr. Vengeance', 'Chan-wook Park', 2002)
+  end
+
+  context "when passed a list of Integers" do
+    it "returns an array containing each value given by one of integers" do
+      @movie.values_at(0, 1).should == ['Sympathy for Mr. Vengeance', 'Chan-wook Park']
+    end
+
+    it "raises IndexError if any of integers is out of range" do
+      -> { @movie.values_at(3) }.should raise_error(IndexError, "offset 3 too large for struct(size:3)")
+      -> { @movie.values_at(-4) }.should raise_error(IndexError, "offset -4 too small for struct(size:3)")
+    end
+  end
+
+  context "when passed an integer Range" do
+    it "returns an array containing each value given by the elements of the range" do
+      @movie.values_at(0..2).should == ['Sympathy for Mr. Vengeance', 'Chan-wook Park', 2002]
+    end
+
+    it "fills with nil values for range elements larger than the structure" do
+      @movie.values_at(0..3).should == ['Sympathy for Mr. Vengeance', 'Chan-wook Park', 2002, nil]
+    end
+
+    it "raises RangeError if any element of the range is negative and out of range" do
+      -> { @movie.values_at(-4..3) }.should raise_error(RangeError, "-4..3 out of range")
+    end
+
+    it "supports endless Range" do
+      @movie.values_at(0..).should == ["Sympathy for Mr. Vengeance", "Chan-wook Park", 2002]
+    end
+
+    it "supports beginningless Range" do
+      @movie.values_at(..2).should == ["Sympathy for Mr. Vengeance", "Chan-wook Park", 2002]
+    end
+  end
+
+  it "supports multiple integer Ranges" do
+    @movie.values_at(0..2, 1..2).should == ['Sympathy for Mr. Vengeance', 'Chan-wook Park', 2002, 'Chan-wook Park', 2002]
+  end
+
+  it "supports mixing integer Ranges and Integers" do
+    @movie.values_at(0..2, 2).should == ['Sympathy for Mr. Vengeance', 'Chan-wook Park', 2002, 2002]
+  end
+
+  it "returns a new empty Array if no arguments given" do
+    @movie.values_at().should == []
   end
 
   it "fails when passed unsupported types" do
-    car = StructClasses::Car.new('Ford', 'Ranger')
-    -> { car.values_at('make') }.should raise_error(TypeError)
+    -> { @movie.values_at('make') }.should raise_error(TypeError, "no implicit conversion of String into Integer")
   end
 end