Add test_abstract_numbers from CPython 3.8

Author: palaviv

Lib/test/test_abstract_numbers.py

@@ -0,0 +1,44 @@
+"""Unit tests for numbers.py."""
+
+import math
+import operator
+import unittest
+from numbers import Complex, Real, Rational, Integral
+
+class TestNumbers(unittest.TestCase):
+    def test_int(self):
+        self.assertTrue(issubclass(int, Integral))
+        self.assertTrue(issubclass(int, Complex))
+
+        self.assertEqual(7, int(7).real)
+        self.assertEqual(0, int(7).imag)
+        self.assertEqual(7, int(7).conjugate())
+        self.assertEqual(-7, int(-7).conjugate())
+        self.assertEqual(7, int(7).numerator)
+        self.assertEqual(1, int(7).denominator)
+
+    def test_float(self):
+        self.assertFalse(issubclass(float, Rational))
+        self.assertTrue(issubclass(float, Real))
+
+        self.assertEqual(7.3, float(7.3).real)
+        self.assertEqual(0, float(7.3).imag)
+        self.assertEqual(7.3, float(7.3).conjugate())
+        self.assertEqual(-7.3, float(-7.3).conjugate())
+
+    def test_complex(self):
+        self.assertFalse(issubclass(complex, Real))
+        self.assertTrue(issubclass(complex, Complex))
+
+        c1, c2 = complex(3, 2), complex(4,1)
+        # XXX: This is not ideal, but see the comment in math_trunc().
+        self.assertRaises(TypeError, math.trunc, c1)
+        self.assertRaises(TypeError, operator.mod, c1, c2)
+        self.assertRaises(TypeError, divmod, c1, c2)
+        self.assertRaises(TypeError, operator.floordiv, c1, c2)
+        self.assertRaises(TypeError, float, c1)
+        self.assertRaises(TypeError, int, c1)
+
+
+if __name__ == "__main__":
+    unittest.main()