import random
from unittest import TestCase, main as unittest_main

from register import Accumulator, Register

TESTS = []


class RegisterTest(TestCase):
    def setUp(self):
        Register.registers = []
        self.test_accumulator = Accumulator(8)
        self.test_register = Register(8)


class TestSetterGetter(RegisterTest):
    def test_set(self):
        test_val = random.randint(0, 255)
        self.test_register.set(test_val)
        self.assertEqual(self.test_register.value, test_val)

    def test_set_overflow(self):
        test_val = random.randint(256, 1024)
        self.test_register.set(test_val)
        self.assertEqual(test_val % 256, self.test_register.value)

    def test_2s_complement(self):
        test_val = -random.randint(0, 127)
        self.test_register.set(test_val)
        self.assertEqual(self.test_register.get_signed(), test_val)

    def test_2s_complement_overflow(self):
        test_val = -random.randint(128, 1024)
        self.test_register.set(test_val)
        self.assertEqual(self.test_register.get_signed(), test_val % -128)


class TestNegation(RegisterTest):
    def test_negate(self):
        test_val = random.randint(0, 127)
        self.test_register.set(test_val)
        self.test_register.negate()
        self.assertEqual(self.test_register.get_signed(), -test_val)

    def test_negate_overflow(self):
        test_val = random.randint(128, 1024)
        self.test_register.set(test_val)
        self.test_register.negate()
        self.assertEqual(self.test_register.get_signed(), -test_val % -128)

    def test_negate_negative(self):

        test_val = -random.randint(0, 127)
        self.test_register.set(test_val)
        self.test_register.negate()
        self.assertEqual(self.test_register.get_signed(), -test_val)

    def test_negate_negative_overflow(self):
        test_val = -random.randint(128, 1024)
        self.test_register.set(test_val)
        self.test_register.negate()
        self.assertEqual(self.test_register.get_signed(), -test_val % 128)


class TestAritmetic(RegisterTest):
    pass


if __name__ == "__main__":
    unittest_main()