Fixed to write_headers option behavior when given no rows.

  [Bug #9988][ruby-core:63375]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59640 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 13 insertions, 0 deletions

diff --git a/test/csv/test_interface.rb b/test/csv/test_interface.rb
index 0ae03b0184..f2c774f606 100755
--- a/test/csv/test_interface.rb
+++ b/test/csv/test_interface.rb
@@ -295,6 +295,19 @@ class TestCSV::Interface < TestCSV
     end
   end
 
+  def test_write_headers_empty
+    File.unlink(@path)
+
+    CSV.open( @path, "wb", headers:       "b|a|c",
+                           write_headers: true,
+                           col_sep:       "|" ) do |csv|
+    end
+
+    File.open(@path, "rb") do |f|
+      assert_equal("b|a|c", f.gets.strip)
+    end
+  end
+
   def test_append  # aliased add_row() and puts()
     File.unlink(@path)