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src/test_calculator.py

+import unittest
+import calculator
+
+class TestClass(unittest.TestCase):
+    def test_add(self):
+        self.assertEqual(calculator.add(21,11),32)
+
+    def test_substract(self):
+        self.assertEqual(calculator.substract(10,5),5)    
+
+    def test_multiply(self):
+        self.assertEqual(calculator.multiply(2,8),16)
+
+    def test_divide(self):
+        self.assertEqual(calculator.divide(-1,1),-1)
+        
+        with self.assertRaises(ValueError):
+            calculator.divide(10,0)
+
+if __name__ == '__main__':
+    unittest.main()
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