Import CSV 3.0.8

This includes performance improvements and backward incompatibility
fixes.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@67560 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/csv/write/test_converters.rb

@@ -0,0 +1,53 @@
+# -*- coding: utf-8 -*-
+# frozen_string_literal: false
+
+require_relative "../helper"
+
+module TestCSVWriteConverters
+  def test_one
+    assert_equal(%Q[=a,=b,=c\n],
+                 generate_line(["a", "b", "c"],
+                               write_converters: ->(value) {"=" + value}))
+  end
+
+  def test_multiple
+    assert_equal(%Q[=a_,=b_,=c_\n],
+                 generate_line(["a", "b", "c"],
+                               write_converters: [
+                                 ->(value) {"=" + value},
+                                 ->(value) {value + "_"},
+                               ]))
+  end
+
+  def test_nil_value
+    assert_equal(%Q[a,NaN,c\n],
+                 generate_line(["a", nil, "c"],
+                               write_nil_value: "NaN"))
+  end
+
+  def test_empty_value
+    assert_equal(%Q[a,,c\n],
+                 generate_line(["a", "", "c"],
+                               write_empty_value: nil))
+  end
+end
+
+class TestCSVWriteConvertersGenerateLine < Test::Unit::TestCase
+  include TestCSVWriteConverters
+  extend DifferentOFS
+
+  def generate_line(row, **kwargs)
+    CSV.generate_line(row, **kwargs)
+  end
+end
+
+class TestCSVWriteConvertersGenerate < Test::Unit::TestCase
+  include TestCSVWriteConverters
+  extend DifferentOFS
+
+  def generate_line(row, **kwargs)
+    CSV.generate(**kwargs) do |csv|
+      csv << row
+    end
+  end
+end