Merge csv-3.0.0 from ruby/csv repository.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@64638 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 8 insertions, 0 deletions

diff --git a/test/csv/test_row.rb b/test/csv/test_row.rb
index 23df4d4fe6..67ed65c0db 100755
--- a/test/csv/test_row.rb
+++ b/test/csv/test_row.rb
@@ -419,4 +419,12 @@ class TestCSV::Row < TestCSV
       row.dig("A", 0)
     end
   end
+
+  def test_dup
+    row = CSV::Row.new(["A"], ["foo"])
+    dupped_row = row.dup
+    dupped_row.delete("A")
+    assert_equal(["foo", nil],
+                 [row["A"], dupped_row["A"]])
+  end
 end