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import unittest

import calc

class TestCalc(unittest.TestCase):

def test_add(self):

self.assertEqual(calc.add(10, 5), 15)

self.assertEqual(calc.add(-1, 1), 0)

self.assertEqual(calc.add(-1, -1), -2)

def test_subtract(self):

self.assertEqual(calc.subtract(10, 5), 5)

self.assertEqual(calc.subtract(-1, 1), -2)

self.assertEqual(calc.subtract(-1, -1), 0)

def test_multiply(self):

self.assertEqual(calc.multiply(10, 5), 50)

self.assertEqual(calc.multiply(-1, 1), -1)

self.assertEqual(calc.multiply(-1, -1), 1)

def test_divide(self):

self.assertEqual(calc.divide(10, 5), 2)

self.assertEqual(calc.divide(-1, 1), -1)

self.assertEqual(calc.divide(-1, -1), 1)

self.assertEqual(calc.divide(5, 2), 2.5)

with self.assertRaises(ValueError):

calc.divide(10, 0)

if __name__ == '__main__':

unittest.main()