1 files changed, 42 insertions, 0 deletions
diff --git a/test/test_raindrops.rb b/test/test_raindrops.rb
index 0749694..6351c66 100644
--- a/test/test_raindrops.rb
+++ b/test/test_raindrops.rb
@@ -1,6 +1,7 @@
  # -*- encoding: binary -*-
  require 'test/unit'
  require 'raindrops'
+require 'tempfile'
  
  class TestRaindrops < Test::Unit::TestCase
  
@@ -162,4 +163,45 @@ class TestRaindrops < Test::Unit::TestCase
      assert status.success?
      assert_equal [ 1, 2 ], tmp.to_ary
    end
+
+  def test_io_backed
+    file = Tempfile.new('test_io_backed')
+    rd = Raindrops.new(4, io: file, zero: true)
+    rd[0] = 123
+    rd[1] = 456
+
+    assert_equal 123, rd[0]
+    assert_equal 456, rd[1]
+
+    rd.evaporate!
+
+    file.rewind
+    data = file.read
+    assert_equal 123, data.unpack('L!')[0]
+    assert_equal 456, data[Raindrops::SIZE..data.size].unpack('L!')[0]
+  end
+
+  def test_io_backed_reuse
+    file = Tempfile.new('test_io_backed')
+    rd = Raindrops.new(4, io: file, zero: true)
+    rd[0] = 123
+    rd[1] = 456
+    rd.evaporate!
+
+    rd = Raindrops.new(4, io: file, zero: false)
+    assert_equal 123, rd[0]
+    assert_equal 456, rd[1]
+  end
+
+  def test_iobacked_noreuse
+    file = Tempfile.new('test_io_backed')
+    rd = Raindrops.new(4, io: file, zero: true)
+    rd[0] = 123
+    rd[1] = 456
+    rd.evaporate!
+
+    rd = Raindrops.new(4, io: file, zero: true)
+    assert_equal 0, rd[0]
+    assert_equal 0, rd[1]
+  end
  end