1 files changed, 19 insertions, 0 deletions
diff --git a/test/psych/test_psych.rb b/test/psych/test_psych.rb
index 88fe83c19a..22baa1489e 100644
--- a/test/psych/test_psych.rb
+++ b/test/psych/test_psych.rb
@@ -1,5 +1,8 @@
 require_relative 'helper'
 
+require 'stringio'
+require 'tempfile'
+
 class TestPsych < Psych::TestCase
   def test_dump_stream
     things = [22, "foo \n", {}]
@@ -7,6 +10,22 @@ class TestPsych < Psych::TestCase
     assert_equal things, Psych.load_stream(stream)
   end
 
+  def test_dump_file
+    hash = {'hello' => 'TGIF!'}
+    Tempfile.open('fun.yml') do |io|
+      assert_equal io, Psych.dump(hash, io)
+      io.rewind
+      assert_equal Psych.dump(hash), io.read
+    end
+  end
+
+  def test_dump_io
+    hash = {'hello' => 'TGIF!'}
+    stringio = StringIO.new ''
+    assert_equal stringio, Psych.dump(hash, stringio)
+    assert_equal Psych.dump(hash), stringio.string
+  end
+
   def test_simple
     assert_equal 'foo', Psych.load("--- foo\n")
   end