def test_safe_pop_first():
data = [3, 4, 5]
datum = safe_pop(data, 0)
assert datum == 3, \
'Datum should be the first element'
def test_safe_pop_index_default():
data = [3, 4, 5]
datum = safe_pop(data)
assert datum == 3, \
'return value should be the first element by default'
def test_safe_pop_empty():
datum = safe_pop([])
assert datum is None, \
'return value should be None by default'
def test_safe_pop_empty_default():
datum = safe_pop([], default=0)
assert datum == 0, \
'return value should be 0 by default'
def test_safe_pop_last():
data = [3, 4, 5]
datum = safe_pop(data, -1)
assert datum == 5, \
'Datum should be the last element'