1 files changed, 45 insertions, 0 deletions
diff --git a/spec/ruby/core/io/each_codepoint_spec.rb b/spec/ruby/core/io/each_codepoint_spec.rb
new file mode 100644
index 0000000000..eb16e004fa
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+++ b/spec/ruby/core/io/each_codepoint_spec.rb
@@ -0,0 +1,45 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../fixtures/classes', __FILE__)
+require File.expand_path('../shared/codepoints', __FILE__)
+
+# See redmine #1667
+describe "IO#each_codepoint" do
+  it_behaves_like(:io_codepoints, :codepoints)
+end
+
+describe "IO#each_codepoint" do
+  before :each do
+    @io = IOSpecs.io_fixture "lines.txt"
+  end
+
+  after :each do
+    @io.close if @io
+  end
+
+  it "calls the given block" do
+    r = []
+    @io.each_codepoint { |c| r << c }
+    r[24].should == 232
+    r.last.should == 10
+  end
+
+  it "returns self" do
+    @io.each_codepoint { |l| l }.should equal(@io)
+  end
+end
+
+describe "IO#each_codepoint" do
+  before :each do
+    @io = IOSpecs.io_fixture("incomplete.txt")
+  end
+
+  after :each do
+    @io.close if @io
+  end
+
+  ruby_version_is "2.3" do # earlier versions stay blocked
+    it "raises an exception at incomplete character before EOF when conversion takes place" do
+      lambda { @io.each_codepoint {} }.should raise_error(ArgumentError)
+    end
+  end
+end