1 files changed, 57 insertions, 0 deletions
diff --git a/spec/ruby/core/io/each_byte_spec.rb b/spec/ruby/core/io/each_byte_spec.rb
new file mode 100644
index 0000000000..fe299f0fba
--- /dev/null
+++ b/spec/ruby/core/io/each_byte_spec.rb
@@ -0,0 +1,57 @@
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+
+describe "IO#each_byte" do
+  before :each do
+    ScratchPad.record []
+    @io = IOSpecs.io_fixture "lines.txt"
+  end
+
+  after :each do
+    @io.close if @io
+  end
+
+  it "raises IOError on closed stream" do
+    -> { IOSpecs.closed_io.each_byte {} }.should.raise(IOError)
+  end
+
+  it "yields each byte" do
+    count = 0
+    @io.each_byte do |byte|
+      ScratchPad << byte
+      break if 4 < count += 1
+    end
+
+    ScratchPad.recorded.should == [86, 111, 105, 99, 105]
+  end
+
+  describe "when no block is given" do
+    it "returns an Enumerator" do
+      enum = @io.each_byte
+      enum.should.instance_of?(Enumerator)
+      enum.first(5).should == [86, 111, 105, 99, 105]
+    end
+
+    describe "returned Enumerator" do
+      describe "size" do
+        it "should return nil" do
+          @io.each_byte.size.should == nil
+        end
+      end
+    end
+  end
+end
+
+describe "IO#each_byte" do
+  before :each do
+    @io = IOSpecs.io_fixture "empty.txt"
+  end
+
+  after :each do
+    @io.close unless @io.closed?
+  end
+
+  it "returns self on an empty stream" do
+    @io.each_byte { |b| }.should.equal?(@io)
+  end
+end