2018-10-15 04:16:51 +02:00
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import unittest
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2018-08-16 06:43:38 +02:00
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from torba.util import ArithUint256
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class TestArithUint256(unittest.TestCase):
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2018-10-09 05:26:45 +02:00
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def test_arithunit256(self):
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2018-08-16 06:43:38 +02:00
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# https://github.com/bitcoin/bitcoin/blob/master/src/test/arith_uint256_tests.cpp
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from_compact = ArithUint256.from_compact
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eq = self.assertEqual
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eq(from_compact(0).value, 0)
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eq(from_compact(0x00123456).value, 0)
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eq(from_compact(0x01003456).value, 0)
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eq(from_compact(0x02000056).value, 0)
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eq(from_compact(0x03000000).value, 0)
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eq(from_compact(0x04000000).value, 0)
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eq(from_compact(0x00923456).value, 0)
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eq(from_compact(0x01803456).value, 0)
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eq(from_compact(0x02800056).value, 0)
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eq(from_compact(0x03800000).value, 0)
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eq(from_compact(0x04800000).value, 0)
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# Make sure that we don't generate compacts with the 0x00800000 bit set
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uint = ArithUint256(0x80)
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eq(uint.compact, 0x02008000)
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uint = from_compact(0x01123456)
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eq(uint.value, 0x12)
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eq(uint.compact, 0x01120000)
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uint = from_compact(0x01fedcba)
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eq(uint.value, 0x7e)
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eq(uint.negative, 0x01fe0000)
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uint = from_compact(0x02123456)
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eq(uint.value, 0x1234)
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eq(uint.compact, 0x02123400)
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uint = from_compact(0x03123456)
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eq(uint.value, 0x123456)
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eq(uint.compact, 0x03123456)
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uint = from_compact(0x04123456)
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eq(uint.value, 0x12345600)
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eq(uint.compact, 0x04123456)
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uint = from_compact(0x04923456)
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eq(uint.value, 0x12345600)
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eq(uint.negative, 0x04923456)
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uint = from_compact(0x05009234)
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eq(uint.value, 0x92340000)
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eq(uint.compact, 0x05009234)
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uint = from_compact(0x20123456)
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eq(uint.value, 0x1234560000000000000000000000000000000000000000000000000000000000)
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eq(uint.compact, 0x20123456)
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