Implement BSON::ByteBuffer#==

lib/bson/byte_buffer.rb

@@ -231,6 +231,10 @@ module BSON
     def more?
       @cursor < @str.size
     end
+    
+    def ==(other)
+      other.respond_to?(:to_s) && @str == other.to_s
+    end
 
     def to_a
       @str.unpack("C*")

test/bson/byte_buffer_test.rb

@@ -186,5 +186,16 @@ class ByteBufferTest < Test::Unit::TestCase
     @buf.get_int
     assert !@buf.more?
   end
+  
+  def test_equality
+    @buf = ByteBuffer.new("foo")
+    assert_equal @buf, @buf
+    assert_equal ByteBuffer.new(""), ByteBuffer.new("")
+    assert_equal ByteBuffer.new("123"), ByteBuffer.new("123")
+    assert_not_equal ByteBuffer.new("123"), ByteBuffer.new("1234")
+    assert_equal @buf, "foo"
+    assert_not_equal @buf, 123
+    assert_not_equal @buf, nil
+  end
 
 end