diff --git a/lib/spreadsheet/excel/writer/workbook.rb b/lib/spreadsheet/excel/writer/workbook.rb
index ae650da..9119717 100644
--- a/lib/spreadsheet/excel/writer/workbook.rb
+++ b/lib/spreadsheet/excel/writer/workbook.rb
@@ -96,6 +96,7 @@ def number_format_index workbook, format
     @number_formats[workbook][format] || 0
   end
   def sanitize_worksheets sheets
+    return sheets if sheets.empty?
     found_selected = false
     sheets.each do |sheet|
       found_selected ||= sheet.selected
diff --git a/test/excel/writer/workbook.rb b/test/excel/writer/workbook.rb
new file mode 100644
index 0000000..b658619
--- /dev/null
+++ b/test/excel/writer/workbook.rb
@@ -0,0 +1,23 @@
+#!/usr/bin/env ruby
+# Excel::Writer::TestWorkbook -- Spreadsheet -- 20.07.2011
+
+$: << File.expand_path('../../../lib', File.dirname(__FILE__))
+
+require 'test/unit'
+require 'spreadsheet'
+
+module Spreadsheet
+  module Excel
+    module Writer
+      class TestWorkbook < Test::Unit::TestCase
+        def test_sanitize_worksheets
+          book = Spreadsheet::Excel::Workbook.new
+          assert_instance_of Excel::Workbook, book
+          assert_equal book.worksheets.size, 0
+          workbook_writer = Excel::Writer::Workbook.new book
+          assert_nothing_raised { workbook_writer.sanitize_worksheets book.worksheets }
+        end
+      end
+    end
+  end
+end
diff --git a/test/excel/writer/worksheet.rb b/test/excel/writer/worksheet.rb
index 14354aa..4acb98d 100644
--- a/test/excel/writer/worksheet.rb
+++ b/test/excel/writer/worksheet.rb
@@ -1,5 +1,5 @@
 #!/usr/bin/env ruby
-# Excel::Writer::TestWorksheet -- Spreadheet -- 21.11.2007 -- hwyss@ywesee.com
+# Excel::Writer::TestWorksheet -- Spreadsheet -- 21.11.2007 -- hwyss@ywesee.com
 
 require 'test/unit'
 require 'spreadsheet/excel/writer/worksheet'
diff --git a/test/integration.rb b/test/integration.rb
index a6083f3..25ebc29 100644
--- a/test/integration.rb
+++ b/test/integration.rb
@@ -1,6 +1,6 @@
 #!/usr/bin/env ruby
 # encoding: utf-8
-# TestIntegration -- Spreadheet -- 08.10.2007 -- hwyss@ywesee.com
+# TestIntegration -- Spreadsheet -- 08.10.2007 -- hwyss@ywesee.com
 
 $: << File.expand_path('../lib', File.dirname(__FILE__))
 
diff --git a/test/suite.rb b/test/suite.rb
index 6a71f05..47c5e6d 100755
--- a/test/suite.rb
+++ b/test/suite.rb
@@ -2,13 +2,14 @@
 # suite.rb -- oddb -- 08.01.2009 -- hwyss@ywesee.com
 
 require 'find'
+require 'rubygems'
 
 here = File.dirname(__FILE__)
 
 $: << here
 
 Find.find(here) do |file|
-	if /(?<!suite)\.rb$/o.match(file)
+	if /[^suite\W]\.rb$/o.match(file)
     require file
 	end
 end
diff --git a/test/workbook.rb b/test/workbook.rb
index edc731e..8869e76 100644
--- a/test/workbook.rb
+++ b/test/workbook.rb
@@ -1,5 +1,5 @@
 #!/usr/bin/env ruby
-# TestWorkbook -- Spreadheet -- 24.09.2008 -- hwyss@ywesee.com
+# TestWorkbook -- Spreadsheet -- 24.09.2008 -- hwyss@ywesee.com
 
 $: << File.expand_path('../lib', File.dirname(__FILE__))
 
diff --git a/test/worksheet.rb b/test/worksheet.rb
index 7ec35f9..91cc401 100644
--- a/test/worksheet.rb
+++ b/test/worksheet.rb
@@ -1,5 +1,5 @@
 #!/usr/bin/env ruby
-# TestWorksheet -- Spreadheet -- 30.09.2008 -- hwyss@ywesee.com
+# TestWorksheet -- Spreadsheet -- 30.09.2008 -- hwyss@ywesee.com
 
 $: << File.expand_path('../lib', File.dirname(__FILE__))