1 files changed, 47 insertions, 0 deletions
diff --git a/spec/ruby/library/stringio/each_codepoint_spec.rb b/spec/ruby/library/stringio/each_codepoint_spec.rb
new file mode 100644
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+++ b/spec/ruby/library/stringio/each_codepoint_spec.rb
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+require_relative '../../spec_helper'
+require 'stringio'
+
+# See redmine #1667
+describe "StringIO#each_codepoint" do
+  before :each do
+    @io = StringIO.new("∂φ/∂x = gaîté")
+    @enum = @io.each_codepoint
+  end
+
+  it "returns an Enumerator" do
+    @enum.should.instance_of?(Enumerator)
+  end
+
+  it "yields each codepoint code in turn" do
+    @enum.to_a.should == [8706, 966, 47, 8706, 120, 32, 61, 32, 103, 97, 238, 116, 233]
+  end
+
+  it "yields each codepoint starting from the current position" do
+    @io.pos = 15
+    @enum.to_a.should == [238, 116, 233]
+  end
+
+  it "raises an error if reading invalid sequence" do
+    @io.pos = 1  # inside of a multibyte sequence
+    -> { @enum.first }.should.raise(ArgumentError)
+  end
+
+  it "raises an IOError if not readable" do
+    @io.close_read
+    -> { @enum.to_a }.should.raise(IOError)
+
+    io = StringIO.new(+"xyz", "w")
+    -> { io.each_codepoint.to_a }.should.raise(IOError)
+  end
+
+
+  it "calls the given block" do
+    r  = []
+    @io.each_codepoint{|c| r << c }
+    r.should == [8706, 966, 47, 8706, 120, 32, 61, 32, 103, 97, 238, 116, 233]
+  end
+
+  it "returns self" do
+    @io.each_codepoint {|l| l }.should.equal?(@io)
+  end
+end