builtin_range.py

from testutils import assert_raises

assert range(2**63+1)[2**63] == 9223372036854775808

# len tests
assert len(range(10, 5)) == 0, 'Range with no elements should have length = 0'
assert len(range(10, 5, -2)) == 3, 'Expected length 3, for elements: 10, 8, 6'
assert len(range(5, 10, 2)) == 3, 'Expected length 3, for elements: 5, 7, 9'

# index tests
assert range(10).index(6) == 6
assert range(4, 10).index(6) == 2
assert range(4, 10, 2).index(6) == 1
assert range(10, 4, -2).index(8) == 1

assert_raises(ValueError, lambda: range(10).index(-1), 'out of bounds')
assert_raises(ValueError, lambda: range(10).index(10), 'out of bounds')
assert_raises(ValueError, lambda: range(4, 10, 2).index(5), 'out of step')
assert_raises(ValueError, lambda: range(10).index('foo'), 'not an int')

# count tests
assert range(10).count(2) == 1
assert range(10).count(11) == 0
assert range(10).count(-1) == 0
assert range(9, 12).count(10) == 1
assert range(4, 10, 2).count(4) == 1
assert range(4, 10, 2).count(7) == 0
assert range(10).count("foo") == 0

# __bool__
assert bool(range(1))
assert bool(range(1, 2))

assert not bool(range(0))
assert not bool(range(1, 1))

# __contains__
assert 6 in range(10)
assert 6 in range(4, 10)
assert 6 in range(4, 10, 2)
assert 10 in range(10, 4, -2)
assert 8 in range(10, 4, -2)

assert -1 not in range(10)
assert 9 not in range(10, 4, -2)
assert 4 not in range(10, 4, -2)
assert 'foo' not in range(10)

# __reversed__
assert list(reversed(range(5))) == [4, 3, 2, 1, 0]
assert list(reversed(range(5, 0, -1))) == [1, 2, 3, 4, 5]
assert list(reversed(range(1,10,5))) == [6, 1]