private static void testWorksheets(ExcelReader target)
{
string[] list = target.GetWorksheetList();
Assert.AreEqual(4, list.Length);
Assert.AreEqual("Plan1", list[0]);
Assert.AreEqual("Plan2", list[1]);
Assert.AreEqual("Plan3", list[2]);
Assert.AreEqual("Sheet1", list[3]);
}