2 files changed, 14 insertions, 0 deletions
diff --git a/spec/ruby/core/enumerator/arithmetic_sequence/begin_spec.rb b/spec/ruby/core/enumerator/arithmetic_sequence/begin_spec.rb
index bed30c546d..bd243fa0b5 100644
--- a/spec/ruby/core/enumerator/arithmetic_sequence/begin_spec.rb
+++ b/spec/ruby/core/enumerator/arithmetic_sequence/begin_spec.rb
@@ -6,4 +6,11 @@ describe "Enumerator::ArithmeticSequence#begin" do
     (1..10).step.begin.should == 1
     (1...10).step.begin.should == 1
   end
+
+  context "with beginless" do
+    it "returns nil as begin of the sequence" do
+      (..10).step(1).begin.should == nil
+      (...10).step(1).begin.should == nil
+    end
+  end
 end
diff --git a/spec/ruby/core/enumerator/arithmetic_sequence/end_spec.rb b/spec/ruby/core/enumerator/arithmetic_sequence/end_spec.rb
index 29e6e105cf..05429cac3e 100644
--- a/spec/ruby/core/enumerator/arithmetic_sequence/end_spec.rb
+++ b/spec/ruby/core/enumerator/arithmetic_sequence/end_spec.rb
@@ -6,4 +6,11 @@ describe "Enumerator::ArithmeticSequence#end" do
     (1..10).step.end.should == 10
     (1...10).step(17).end.should == 10
   end
+
+  context "with endless" do
+    it "returns nil as end of the sequence" do
+      (1..).step(1).end.should == nil
+      (1...).step(1).end.should == nil
+    end
+  end
 end