1 files changed, 18 insertions, 0 deletions
diff --git a/spec/ruby/core/string/codepoints_spec.rb b/spec/ruby/core/string/codepoints_spec.rb
new file mode 100644
index 0000000000..12a5bf5892
--- /dev/null
+++ b/spec/ruby/core/string/codepoints_spec.rb
@@ -0,0 +1,18 @@
+# encoding: binary
+require_relative '../../spec_helper'
+require_relative 'shared/codepoints'
+require_relative 'shared/each_codepoint_without_block'
+
+describe "String#codepoints" do
+  it_behaves_like :string_codepoints, :codepoints
+
+  it "returns an Array when no block is given" do
+    "abc".codepoints.should == [?a.ord, ?b.ord, ?c.ord]
+  end
+
+  it "raises an ArgumentError when no block is given if self has an invalid encoding" do
+    s = "\xDF".dup.force_encoding(Encoding::UTF_8)
+    s.valid_encoding?.should be_false
+    -> { s.codepoints }.should raise_error(ArgumentError)
+  end
+end