naruse	2012-07-25 16:13:24 +0900 (Wed, 25 Jul 2012)

  New Revision: 36535

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=rev&revision=36535

  Log:
    Add test to clarify r36421. [Bug #5915]

  Modified files:
    trunk/test/ruby/test_array.rb

Index: test/ruby/test_array.rb
===================================================================
--- test/ruby/test_array.rb	(revision 36534)
+++ test/ruby/test_array.rb	(revision 36535)
@@ -911,16 +911,19 @@
     $, = ""
     a = @cls[1, 2]
     assert_equal("12", a.join)
+    assert_equal("12", a.join(nil))
     assert_equal("1,2", a.join(','))
 
     $, = ""
     a = @cls[1, 2, 3]
     assert_equal("123", a.join)
+    assert_equal("123", a.join(nil))
     assert_equal("1,2,3", a.join(','))
 
     $, = ":"
     a = @cls[1, 2, 3]
     assert_equal("1:2:3", a.join)
+    assert_equal("1:2:3", a.join(nil))
     assert_equal("1,2,3", a.join(','))
 
     $, = ""

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