mirror of
https://github.com/wassname/segpy.git
synced 2026-06-27 21:38:35 +08:00
Robert Smallshire
51 lines
1.6 KiB
Python
51 lines
1.6 KiB
Python
import unittest
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from ibm_float import ieee2ibm, ibm2ieee
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class Ibm2Ieee(unittest.TestCase):
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def test_zero(self):
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self.assertEqual(ibm2ieee(b'\0\0\0\0'), 0.0)
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def test_positive_half(self):
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self.assertEqual(ibm2ieee((0b11000000, 0x80, 0x00, 0x00)), -0.5)
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def test_negative_half(self):
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self.assertEqual(ibm2ieee((0b01000000, 0x80, 0x00, 0x00)), 0.5)
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def test_one(self):
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self.assertEqual(ibm2ieee(b'\x41\x10\x00\x00'), 1.0)
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def test_negative_118_625(self):
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# Example taken from Wikipedia http://en.wikipedia.org/wiki/IBM_Floating_Point_Architecture
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self.assertEqual(ibm2ieee((0b11000010, 0b01110110, 0b10100000, 0b00000000)), -118.625)
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class Ieee2Ibm(unittest.TestCase):
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def test_zero(self):
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self.assertEqual(ieee2ibm(0.0), b'\0\0\0\0')
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def test_positive_half(self):
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self.assertEqual(ieee2ibm(-0.5), bytes((0b11000000, 0x80, 0x00, 0x00)))
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def test_negative_half(self):
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self.assertEqual(ieee2ibm(0.5), bytes((0b01000000, 0x80, 0x00, 0x00)))
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def test_one(self):
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self.assertEqual(ieee2ibm(1.0), b'\x41\x10\x00\x00')
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def test_negative_118_625(self):
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# Example taken from Wikipedia http://en.wikipedia.org/wiki/IBM_Floating_Point_Architecture
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self.assertEqual(ieee2ibm(-118.625), bytes((0b11000010, 0b01110110, 0b10100000, 0b00000000)))
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def test_0_1(self):
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# Note, this is different from the Wikipedia example, but I'll stick my neck out and say
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# Wikipedia is wrong.
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self.assertEqual(ieee2ibm(0.1), bytes((0b01000000, 0b00011001, 0b10011001, 0b10011001)))
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if __name__ == '__main__':
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unittest.main()
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