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74 lines
2.0 KiB
Python
74 lines
2.0 KiB
Python
def assert_raises(expr, exc_type):
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"""
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Helper function to assert `expr` raises an exception of type `exc_type`
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Args:
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expr: Callable
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exec_type: Exception
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Returns:
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None
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Raises:
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Assertion error on failure
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"""
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try:
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expr(None)
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except exc_type:
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assert True
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else:
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assert False
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assert range(2**63+1)[2**63] == 9223372036854775808
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# len tests
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assert len(range(10, 5)) == 0, 'Range with no elements should have length = 0'
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assert len(range(10, 5, -2)) == 3, 'Expected length 3, for elements: 10, 8, 6'
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assert len(range(5, 10, 2)) == 3, 'Expected length 3, for elements: 5, 7, 9'
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# index tests
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assert range(10).index(6) == 6
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assert range(4, 10).index(6) == 2
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assert range(4, 10, 2).index(6) == 1
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assert range(10, 4, -2).index(8) == 1
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# index raises value error on out of bounds
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assert_raises(lambda _: range(10).index(-1), ValueError)
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assert_raises(lambda _: range(10).index(10), ValueError)
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# index raises value error if out of step
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assert_raises(lambda _: range(4, 10, 2).index(5), ValueError)
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# index raises value error if needle is not an int
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assert_raises(lambda _: range(10).index('foo'), ValueError)
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# count tests
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assert range(10).count(2) == 1
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assert range(10).count(11) == 0
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assert range(10).count(-1) == 0
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assert range(9, 12).count(10) == 1
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assert range(4, 10, 2).count(4) == 1
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assert range(4, 10, 2).count(7) == 0
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assert range(10).count("foo") == 0
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# __bool__
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assert bool(range(1))
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assert bool(range(1, 2))
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assert not bool(range(0))
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assert not bool(range(1, 1))
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# __contains__
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assert 6 in range(10)
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assert 6 in range(4, 10)
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assert 6 in range(4, 10, 2)
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assert 10 in range(10, 4, -2)
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assert 8 in range(10, 4, -2)
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assert -1 not in range(10)
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assert 9 not in range(10, 4, -2)
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assert 4 not in range(10, 4, -2)
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assert 'foo' not in range(10)
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# __reversed__
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assert list(reversed(range(5))) == [4, 3, 2, 1, 0]
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assert list(reversed(range(5, 0, -1))) == [1, 2, 3, 4, 5]
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assert list(reversed(range(1,10,5))) == [6, 1]
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