private void AssertFailedImport(string filename, AcsDataManager man, DbConnection conn)
{
Assert.IsTrue(File.Exists(filename), "Could not find test file " + filename);
man.DesiredVariablesFilename = filename;
DataTable dt = man.GetRequestedVariables(conn);
Assert.IsTrue(dt == null, "Non-null DataTable returned for file " + filename);
}