public void FileWorker_CheckBd()
{
string expected;
string actual;
// when not exist
expected = "not exists";
actual = fw.CheckBd("impossible bd name");
Assert.AreEqual(expected, actual);
// when empty
File.WriteAllText(Variables.path + "test_bdname" + ".bd", "");
expected = "empty";
actual = fw.CheckBd("test_bdname");
Assert.AreEqual(expected, actual);
// when has data
File.WriteAllText(Variables.path + "test_bdname" + ".bd", "some data");
expected = "has data";
actual = fw.CheckBd("test_bdname");
Assert.AreEqual(expected, actual);
File.Delete(Variables.path + "test_bdname" + ".bd");
}