def test_sequencetools_is_monotonically_decreasing_sequence_01():
r'''True when the elements in expr decrease monotonically.
'''
expr = [9, 8, 7, 6, 5, 4, 3, 2, 1, 0]
assert sequencetools.is_monotonically_decreasing_sequence(expr)
expr = [3, 3, 3, 3, 3, 3, 3, 2, 1, 0]
assert sequencetools.is_monotonically_decreasing_sequence(expr)
def test_sequencetools_is_monotonically_decreasing_sequence_02():
r'''False when the elements in l do not decrease monotonically.
'''
expr = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
assert not sequencetools.is_monotonically_decreasing_sequence(expr)
expr = [0, 1, 2, 3, 3, 3, 3, 3, 3, 3]
assert not sequencetools.is_monotonically_decreasing_sequence(expr)
def test_sequencetools_is_monotonically_decreasing_sequence_04():
r'''False when expr is not a sequence.
'''
assert not sequencetools.is_monotonically_decreasing_sequence(17)
def test_sequencetools_is_monotonically_decreasing_sequence_03():
r'''True when expr is empty.
'''
expr = []
assert sequencetools.is_monotonically_decreasing_sequence(expr)
