1 files changed, 70 insertions, 0 deletions
diff --git a/spec/ruby/core/enumerator/rewind_spec.rb b/spec/ruby/core/enumerator/rewind_spec.rb
new file mode 100644
index 0000000000..6ba0edf174
--- /dev/null
+++ b/spec/ruby/core/enumerator/rewind_spec.rb
@@ -0,0 +1,70 @@
+require_relative '../../spec_helper'
+require_relative 'fixtures/common'
+
+describe "Enumerator#rewind" 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.equal? @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
+
+  it "calls the enclosed object's rewind method if one exists" do
+    obj = mock('rewinder')
+    enum = obj.to_enum
+    obj.should_receive(:each).at_most(1)
+    obj.should_receive(:rewind)
+    enum.rewind
+  end
+
+  it "does nothing if the object doesn't have a #rewind method" do
+    obj = mock('rewinder')
+    enum = obj.to_enum
+    obj.should_receive(:each).at_most(1)
+    enum.rewind.should == enum
+  end
+end
+
+describe "Enumerator#rewind" do
+  before :each do
+    ScratchPad.record []
+    @enum = EnumeratorSpecs::Feed.new.to_enum(:each)
+  end
+
+  it "clears a pending #feed value" do
+    @enum.next
+    @enum.feed :a
+    @enum.rewind
+    @enum.next
+    @enum.next
+    ScratchPad.recorded.should == [nil]
+  end
+end