def test_itercsv_emits_data_lines():
"""itercsv should yield individual lines of CSV, with headers"""
expected = [
b'Hello,World\r\n',
b'1,2\r\n',
b'3,4\r\n'
]
assert list(itercsv(['Hello', 'World'], [[1, 2], [3, 4]])) == expected
def test_itercsv_always_emits_headers():
"""itercsv should always emit headers, even where there is no data"""
assert list(itercsv(['Hello', 'World'], [])) == [b'Hello,World\r\n']
def test_itercsv_emits_data_lines():
"""itercsv should yield individual lines of CSV, with headers"""
expected = [b"Hello,World\r\n", b"1,2\r\n", b"3,4\r\n"]
assert list(itercsv(["Hello", "World"], [[1, 2], [3, 4]])) == expected
def test_itercsv_always_emits_headers():
"""itercsv should always emit headers, even where there is no data"""
assert list(itercsv(["Hello", "World"], [])) == [b"Hello,World\r\n"]
