fix commit mistake of r31389.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@31398 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/io/wait/test_io_wait.rb

@@ -0,0 +1,64 @@
+require 'test/unit'
+require 'timeout'
+begin
+  require 'io/wait'
+rescue LoadError
+end
+
+class TestIOWait < Test::Unit::TestCase
+
+  def setup
+    @r, @w = IO.pipe
+  end
+
+  def teardown
+    @r.close unless @r.closed?
+    @w.close unless @w.closed?
+  end
+
+  def test_nread
+    assert_equal 0, @r.nread
+    @w.syswrite "."
+    assert_equal 1, @r.nread
+  end
+
+  def test_nread_buffered
+    @w.syswrite ".\n!"
+    assert_equal ".\n", @r.read(2)
+    assert_equal 1, @r.nread
+  end
+
+  def test_ready?
+    refute @r.ready?
+    @w.syswrite "."
+    assert @r.ready?
+  end
+
+  def test_buffered_ready?
+    @w.syswrite ".\n!"
+    assert_equal ".\n", @r.gets
+    assert @r.ready?
+  end
+
+  def test_wait
+    assert_nil @r.wait(0)
+    @w.syswrite "."
+    assert_equal @r, @r.wait(0)
+  end
+
+  def test_wait_buffered
+    @w.syswrite ".\n!"
+    assert_equal ".\n", @r.gets
+    assert_equal true, @r.wait(0)
+  end
+
+  def test_wait_forever
+    Thread.new { sleep 0.01; @w.syswrite "." }
+    assert_equal @r, @r.wait
+  end
+
+  def test_wait_eof
+    Thread.new { sleep 0.01; @w.close }
+    assert_nil @r.wait
+  end
+end if IO.method_defined?(:wait)