akr	2010-01-14 02:00:48 +0900 (Thu, 14 Jan 2010)

  New Revision: 26318

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=rev&revision=26318

  Log:
    add tests.

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

Index: test/ruby/test_process.rb
===================================================================
--- test/ruby/test_process.rb	(revision 26317)
+++ test/ruby/test_process.rb	(revision 26318)
@@ -260,6 +260,24 @@
       system({"fofo"=>"haha"}, *ENVCOMMAND, STDOUT=>"out")
       assert_match(/^fofo=haha$/, File.read("out").chomp)
     }
+
+    old = ENV["hmm"]
+    begin
+      ENV["hmm"] = "fufu"
+      IO.popen(ENVCOMMAND) {|io| assert_match(/^hmm=fufu$/, io.read) }
+      IO.popen([{"hmm"=>""}, *ENVCOMMAND]) {|io| assert_match(/^hmm=$/, io.read) }
+      IO.popen([{"hmm"=>nil}, *ENVCOMMAND]) {|io| assert_not_match(/^hmm=/, io.read) }
+      ENV["hmm"] = ""
+      IO.popen(ENVCOMMAND) {|io| assert_match(/^hmm=$/, io.read) }
+      IO.popen([{"hmm"=>""}, *ENVCOMMAND]) {|io| assert_match(/^hmm=$/, io.read) }
+      IO.popen([{"hmm"=>nil}, *ENVCOMMAND]) {|io| assert_not_match(/^hmm=/, io.read) }
+      ENV["hmm"] = nil
+      IO.popen(ENVCOMMAND) {|io| assert_not_match(/^hmm=/, io.read) }
+      IO.popen([{"hmm"=>""}, *ENVCOMMAND]) {|io| assert_match(/^hmm=$/, io.read) }
+      IO.popen([{"hmm"=>nil}, *ENVCOMMAND]) {|io| assert_not_match(/^hmm=/, io.read) }
+    ensure
+      ENV["hmm"] = old
+    end
   end
 
   def test_execopts_unsetenv_others

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