1 files changed, 81 insertions, 0 deletions
diff --git a/spec/ruby/core/kernel/loop_spec.rb b/spec/ruby/core/kernel/loop_spec.rb
new file mode 100644
index 0000000000..f23e3afb02
--- /dev/null
+++ b/spec/ruby/core/kernel/loop_spec.rb
@@ -0,0 +1,81 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../fixtures/classes', __FILE__)
+
+describe "Kernel.loop" do
+  it "is a private method" do
+    Kernel.should have_private_instance_method(:loop)
+  end
+
+  it "calls block until it is terminated by a break" do
+    i = 0
+    loop do
+      i += 1
+      break if i == 10
+    end
+
+    i.should == 10
+  end
+
+  it "returns value passed to break" do
+    loop do
+      break 123
+    end.should == 123
+  end
+
+  it "returns nil if no value passed to break" do
+    loop do
+      break
+    end.should == nil
+  end
+
+  it "returns an enumerator if no block given" do
+    enum = loop
+    enum.instance_of?(Enumerator).should be_true
+    cnt = 0
+    enum.each do |*args|
+      raise "Args should be empty #{args.inspect}" unless args.empty?
+      cnt += 1
+      break cnt if cnt >= 42
+    end.should == 42
+  end
+
+  it "rescues StopIteration" do
+    loop do
+      raise StopIteration
+    end
+    42.should == 42
+  end
+
+  it "rescues StopIteration's subclasses" do
+    finish = Class.new StopIteration
+    loop do
+      raise finish
+    end
+    42.should == 42
+  end
+
+  it "does not rescue other errors" do
+    lambda{ loop do raise StandardError end }.should raise_error( StandardError )
+  end
+
+  ruby_version_is "2.3" do
+    it "returns StopIteration#result, the result value of a finished iterator" do
+      e = Enumerator.new { |y|
+        y << 1
+        y << 2
+        :stopped
+      }
+      loop { e.next }.should == :stopped
+    end
+  end
+
+  describe "when no block is given" do
+    describe "returned Enumerator" do
+      describe "size" do
+        it "returns Float::INFINITY" do
+          loop.size.should == Float::INFINITY
+        end
+      end
+    end
+  end
+end