def test_bx_decode_empty():
alphabet = ""
string = "a string"
nose.tools.assert_raises(ValueError, lambda: bx_decode(string, alphabet))
alphabet = "abc"
string = ""
nose.tools.assert_raises(ValueError, lambda: bx_decode(string, alphabet))
def test_bx_encode_decode_mapping():
alphabet = "abc"
mapping = {"a": 0, "b": 1, "c": 2}
encoded = bx_encode(3, alphabet)
assert encoded == "ba"
decoded = bx_decode(encoded, alphabet, mapping)
assert decoded == 3
decoded = bx_decode("ba", alphabet, mapping)
assert decoded == 3
def test_bx_encode_decode_deadbeef():
alphabet = "0123456789abcdef"
deadbeef = bx_encode(0xDEADBEEF, alphabet)
assert deadbeef == "deadbeef"
deadbeef = bx_decode(deadbeef, alphabet)
assert deadbeef == 0xDEADBEEF