Testing count_data_sets():
Pass: 3 data sets, text-data with 2 records.
Pass: 2 data sets, data-data with 2 records.
Pass: 2 data sets, data-data-error with 2 records.
Pass: 4 data sets, text-data-single with 4 records.
Pass: 13 data sets, text-data with 3 records.
Pass: 12 data sets, data-data with 3 records.
Pass: 4 data sets, data-data-error with 3 records.
Pass: 3 data sets, text-data-single with 3 records.

Testing color_range():
Pass: From (0, 0, 0) To (255, 255, 255) with 3 steps
Pass: From (255, 0, 0) To (0, 255, 0) with 2 steps
Pass: From (100, 0, 100) To (0, 100, 0) with 6 steps