def test_csv_formatter_format_header():
"""Tests CSVFormatter.format_header() method."""
columns = ['t', 'x', 'y', 'z', 'V']
formatter = CSVFormatter(columns=columns)
assert formatter.format_header() == 't,x,y,z,V'
def test_csv_formatter_format():
"""Tests CSVFormatter.format() method."""
columns = ['t', 'x', 'y', 'z', 'V']
formatter = CSVFormatter(columns=columns)
data = {'t': 1, 'y': 2, 'z': 3.0, 'x': -1, 'V': 'abc'}
assert formatter.format(data) == '1,-1,2,3.0,abc'