8 files changed, 334 insertions, 0 deletions
diff --git a/spec/rubyspec/shared/enumerator/each.rb b/spec/rubyspec/shared/enumerator/each.rb
new file mode 100644
index 0000000000..bbab86fed7
--- /dev/null
+++ b/spec/rubyspec/shared/enumerator/each.rb
@@ -0,0 +1,89 @@
+# -*- encoding: us-ascii -*-
+
+describe :enum_each, shared: true do
+  before :each do
+    object_each_with_arguments = Object.new
+    def object_each_with_arguments.each_with_arguments(arg, *args)
+      yield arg, *args
+      :method_returned
+    end
+
+    @enum_with_arguments = object_each_with_arguments.to_enum(:each_with_arguments, :arg0, :arg1, :arg2)
+
+    @enum_with_yielder = Enumerator.new {|y| y.yield :ok}
+  end
+
+  it "yields each element of self to the given block" do
+    acc = []
+    [1,2,3].to_enum.each {|e| acc << e }
+    acc.should == [1,2,3]
+  end
+
+  it "calls #each on the object given in the constructor by default" do
+    each = mock('each')
+    each.should_receive(:each)
+    each.to_enum.each {|e| e }
+  end
+
+  it "calls #each on the underlying object until it's exhausted" do
+    each = mock('each')
+    each.should_receive(:each).and_yield(1).and_yield(2).and_yield(3)
+    acc = []
+    each.to_enum.each {|e| acc << e }
+    acc.should == [1,2,3]
+  end
+
+  it "calls the method given in the constructor instead of #each" do
+    each = mock('peach')
+    each.should_receive(:peach)
+    each.to_enum(:peach).each {|e| e }
+  end
+
+  it "calls the method given in the constructor until it's exhausted" do
+    each = mock('each')
+    each.should_receive(:each).and_yield(1).and_yield(2).and_yield(3)
+    acc = []
+    each.to_enum.each {|e| acc << e }
+    acc.should == [1,2,3]
+  end
+
+  it "raises a NoMethodError if the object doesn't respond to #each" do
+    enum = Object.new.to_enum
+    lambda do
+      enum.each { |e| e }
+    end.should raise_error(NoMethodError)
+  end
+
+  it "returns self if not given arguments and not given a block" do
+    @enum_with_arguments.each.should equal(@enum_with_arguments)
+
+    @enum_with_yielder.each.should equal(@enum_with_yielder)
+  end
+
+  it "returns the same value from receiver.each if block is given" do
+    @enum_with_arguments.each {}.should equal(:method_returned)
+  end
+
+  it "passes given arguments at initialized to receiver.each" do
+    @enum_with_arguments.each.to_a.should == [[:arg0, :arg1, :arg2]]
+  end
+
+  it "requires multiple arguments" do
+    Enumerator.instance_method(:each).arity.should < 0
+  end
+
+  it "appends given arguments to receiver.each" do
+    @enum_with_arguments.each(:each0, :each1).to_a.should == [[:arg0, :arg1, :arg2, :each0, :each1]]
+    @enum_with_arguments.each(:each2, :each3).to_a.should == [[:arg0, :arg1, :arg2, :each2, :each3]]
+  end
+
+  it "returns the same value from receiver.each if block and arguments are given" do
+    @enum_with_arguments.each(:each1, :each2) {}.should equal(:method_returned)
+  end
+
+  it "returns new Enumerator if given arguments but not given a block" do
+    ret = @enum_with_arguments.each 1
+    ret.should be_an_instance_of(Enumerator)
+    ret.should_not equal(@enum_with_arguments)
+  end
+end
diff --git a/spec/rubyspec/shared/enumerator/enum_cons.rb b/spec/rubyspec/shared/enumerator/enum_cons.rb
new file mode 100644
index 0000000000..59eed949d8
--- /dev/null
+++ b/spec/rubyspec/shared/enumerator/enum_cons.rb
@@ -0,0 +1,12 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../../../fixtures/enumerator/classes', __FILE__)
+
+describe :enum_cons, shared: true do
+  it "returns an enumerator of the receiver with iteration of each_cons for each array of n concecutive elements" do
+    a = []
+    enum = EnumSpecs::Numerous.new.enum_cons(3)
+    enum.each {|x| a << x}
+    enum.should be_an_instance_of(Enumerator)
+    a.should == [[2, 5, 3], [5, 3, 6], [3, 6, 1], [6, 1, 4]]
+  end
+end
diff --git a/spec/rubyspec/shared/enumerator/enum_for.rb b/spec/rubyspec/shared/enumerator/enum_for.rb
new file mode 100644
index 0000000000..9030ffbd7d
--- /dev/null
+++ b/spec/rubyspec/shared/enumerator/enum_for.rb
@@ -0,0 +1,50 @@
+describe :enum_for, shared: true do
+  it "is defined in Kernel" do
+    Kernel.method_defined?(@method).should be_true
+  end
+
+  it "returns a new enumerator" do
+    "abc".send(@method).should be_an_instance_of(Enumerator)
+  end
+
+  it "defaults the first argument to :each" do
+    enum = [1,2].send(@method)
+    enum.map { |v| v }.should == [1,2].each { |v| v }
+  end
+
+  it "exposes multi-arg yields as an array" do
+    o = Object.new
+    def o.each
+      yield :a
+      yield :b1, :b2
+      yield [:c]
+      yield :d1, :d2
+      yield :e1, :e2, :e3
+    end
+
+    enum = o.send(@method)
+    enum.next.should == :a
+    enum.next.should == [:b1, :b2]
+    enum.next.should == [:c]
+    enum.next.should == [:d1, :d2]
+    enum.next.should == [:e1, :e2, :e3]
+  end
+
+  it "uses the passed block's value to calculate the size of the enumerator" do
+    Object.new.enum_for { 100 }.size.should == 100
+  end
+
+  it "defers the evaluation of the passed block until #size is called" do
+    ScratchPad.record []
+
+    enum = Object.new.enum_for do
+      ScratchPad << :called
+      100
+    end
+
+    ScratchPad.recorded.should be_empty
+
+    enum.size
+    ScratchPad.recorded.should == [:called]
+  end
+end
diff --git a/spec/rubyspec/shared/enumerator/new.rb b/spec/rubyspec/shared/enumerator/new.rb
new file mode 100644
index 0000000000..23ace99816
--- /dev/null
+++ b/spec/rubyspec/shared/enumerator/new.rb
@@ -0,0 +1,42 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe :enum_new, shared: true do
+  it "creates a new custom enumerator with the given object, iterator and arguments" do
+    enum = Enumerator.new(1, :upto, 3)
+    enum.should be_an_instance_of(Enumerator)
+  end
+
+  it "creates a new custom enumerator that responds to #each" do
+    enum = Enumerator.new(1, :upto, 3)
+    enum.respond_to?(:each).should == true
+  end
+
+  it "creates a new custom enumerator that runs correctly" do
+    Enumerator.new(1, :upto, 3).map{|x|x}.should == [1,2,3]
+  end
+
+  it "aliases the second argument to :each" do
+    Enumerator.new(1..2).to_a.should == Enumerator.new(1..2, :each).to_a
+  end
+
+  it "doesn't check for the presence of the iterator method" do
+    Enumerator.new(nil).should be_an_instance_of(Enumerator)
+  end
+
+  it "uses the latest define iterator method" do
+    class StrangeEach
+      def each
+        yield :foo
+      end
+    end
+    enum = Enumerator.new(StrangeEach.new)
+    enum.to_a.should == [:foo]
+    class StrangeEach
+      def each
+        yield :bar
+      end
+    end
+    enum.to_a.should == [:bar]
+  end
+
+end
diff --git a/spec/rubyspec/shared/enumerator/next.rb b/spec/rubyspec/shared/enumerator/next.rb
new file mode 100644
index 0000000000..d8ae6d9673
--- /dev/null
+++ b/spec/rubyspec/shared/enumerator/next.rb
@@ -0,0 +1,28 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe :enum_next, shared: true do
+
+  before :each do
+    @enum = 1.upto(3)
+  end
+
+  it "returns the next element of the enumeration" do
+    @enum.next.should == 1
+    @enum.next.should == 2
+    @enum.next.should == 3
+  end
+
+  it "raises a StopIteration exception at the end of the stream" do
+    3.times { @enum.next }
+    lambda { @enum.next }.should raise_error(StopIteration)
+  end
+
+  it "cannot be called again until the enumerator is rewound" do
+    3.times { @enum.next }
+    lambda { @enum.next }.should raise_error(StopIteration)
+    lambda { @enum.next }.should raise_error(StopIteration)
+    lambda { @enum.next }.should raise_error(StopIteration)
+    @enum.rewind
+    @enum.next.should == 1
+  end
+end
diff --git a/spec/rubyspec/shared/enumerator/rewind.rb b/spec/rubyspec/shared/enumerator/rewind.rb
new file mode 100644
index 0000000000..4d4139204c
--- /dev/null
+++ b/spec/rubyspec/shared/enumerator/rewind.rb
@@ -0,0 +1,39 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe :enum_rewind, shared: true do
+
+  before :each do
+    @enum = 1.upto(3)
+  end
+
+  it "resets the enumerator to its initial state" do
+    @enum.next.should == 1
+    @enum.next.should == 2
+    @enum.rewind
+    @enum.next.should == 1
+  end
+
+  it "returns self" do
+    @enum.rewind.should == @enum
+  end
+
+  it "has no effect on a new enumerator" do
+    @enum.rewind
+    @enum.next.should == 1
+  end
+
+  it "has no effect if called multiple, consecutive times" do
+    @enum.next.should == 1
+    @enum.rewind
+    @enum.rewind
+    @enum.next.should == 1
+  end
+
+  it "works with peek to reset the position" do
+    @enum.next
+    @enum.next
+    @enum.rewind
+    @enum.next
+    @enum.peek.should == 2
+  end
+end
diff --git a/spec/rubyspec/shared/enumerator/with_index.rb b/spec/rubyspec/shared/enumerator/with_index.rb
new file mode 100644
index 0000000000..37048a7b52
--- /dev/null
+++ b/spec/rubyspec/shared/enumerator/with_index.rb
@@ -0,0 +1,32 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe :enum_with_index, shared: true do
+
+  require File.expand_path('../../../fixtures/enumerator/classes', __FILE__)
+
+  before :each do
+    @enum = [1, 2, 3, 4].to_enum
+  end
+
+  it "passes each element and its index to block" do
+    @a = []
+    @enum.send(@method) { |o, i| @a << [o, i] }
+    @a.should == [[1, 0], [2, 1], [3, 2], [4, 3]]
+  end
+
+  it "returns the object being enumerated when given a block" do
+    [1, 2, 3, 4].should == @enum.send(@method) { |o, i| :glark }
+  end
+
+  it "binds splat arguments properly" do
+    acc = []
+    @enum.send(@method) { |*b| c,d = b; acc << c; acc << d }
+    [1, 0, 2, 1, 3, 2, 4, 3].should == acc
+  end
+
+  it "returns an enumerator if no block is supplied" do
+    ewi = @enum.send(@method)
+    ewi.should be_an_instance_of(Enumerator)
+    ewi.to_a.should == [[1, 0], [2, 1], [3, 2], [4, 3]]
+  end
+end
diff --git a/spec/rubyspec/shared/enumerator/with_object.rb b/spec/rubyspec/shared/enumerator/with_object.rb
new file mode 100644
index 0000000000..1830736713
--- /dev/null
+++ b/spec/rubyspec/shared/enumerator/with_object.rb
@@ -0,0 +1,42 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe :enum_with_object, shared: true do
+  before :each do
+    @enum = [:a, :b].to_enum
+    @memo = ''
+    @block_params = @enum.send(@method, @memo).to_a
+  end
+
+  it "receives an argument" do
+    @enum.method(@method).arity.should == 1
+  end
+
+  context "with block" do
+    it "returns the given object" do
+      ret = @enum.send(@method, @memo) do |elm, memo|
+        # nothing
+      end
+      ret.should equal(@memo)
+    end
+
+    context "the block parameter" do
+      it "passes each element to first parameter" do
+        @block_params[0][0].should equal(:a)
+        @block_params[1][0].should equal(:b)
+      end
+
+      it "passes the given object to last parameter" do
+        @block_params[0][1].should equal(@memo)
+        @block_params[1][1].should equal(@memo)
+      end
+    end
+  end
+
+  context "without block" do
+    it "returns new Enumerator" do
+      ret = @enum.send(@method, @memo)
+      ret.should be_an_instance_of(Enumerator)
+      ret.should_not equal(@enum)
+    end
+  end
+end