def test_square_root_string(self):
"""test case if we give string"""
test = ScientificCalc()
self.assertEqual(test.square_root("a"), "expecting integer value")
def test_square_root_positive(self):
"""test case for positive value"""
test = ScientificCalc()
self.assertEqual(test.square_root(4), 2.0)
def test_square_root_negative(self):
"""test case for negative value"""
test = ScientificCalc()
self.assertEqual(test.square_root(-8),
complex(1.7319121124709868e-16 + 2.8284271247461903j))