1 files changed, 36 insertions, 0 deletions
diff --git a/spec/ruby/core/enumerator/peek_spec.rb b/spec/ruby/core/enumerator/peek_spec.rb
new file mode 100644
index 0000000000..096fd2b10c
--- /dev/null
+++ b/spec/ruby/core/enumerator/peek_spec.rb
@@ -0,0 +1,36 @@
+require_relative '../../spec_helper'
+
+describe "Enumerator#peek" do
+  before :each do
+    @e = (1..5).to_a.to_enum
+  end
+
+  it "returns the next element in self" do
+    @e.peek.should == 1
+  end
+
+  it "does not advance the position of the current element" do
+    @e.next.should == 1
+    @e.peek.should == 2
+    @e.next.should == 2
+  end
+
+  it "can be called repeatedly without advancing the position of the current element" do
+    @e.peek
+    @e.peek
+    @e.peek.should == 1
+    @e.next.should == 1
+  end
+
+  it "works in concert with #rewind" do
+    @e.next
+    @e.next
+    @e.rewind
+    @e.peek.should == 1
+  end
+
+  it "raises StopIteration if called on a finished enumerator" do
+    5.times { @e.next }
+    -> { @e.peek }.should.raise(StopIteration)
+  end
+end