Multiply two numbers

solutions/multiply_two_numbers.py

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+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+"""
+A module for multiplying two integers.
+
+This module provides the multiply_two_numbers function, which multiplies
+two integers and returns their product.
+
+Module Contents:
+    - multiply_two_numbers: A function to multiply two integers.
+
+Created: 2025-01-04
+Author: Manezhah Mohmand
+"""
+
+
+def multiply_two_numbers(num_one: int, num_two: int) -> int:
+    """
+    Multiplies two integers and returns the product.
+
+    Parameters:
+        num_one (int): The first integer.
+        num_two (int): The second integer.
+
+    Returns:
+        int: The product of the two integers.
+
+    Raises:
+        TypeError: If either num_one or num_two is not an integer.
+
+    Examples:
+        >>> multiply_two_numbers(2, 3)
+        6
+        >>> multiply_two_numbers(-4, 5)
+        -20
+        >>> multiply_two_numbers(-2, -3)
+        6
+        >>> multiply_two_numbers(0, 10)
+        0
+    """
+    # input validation for defensive test
+    if not isinstance(num_one, int) or not isinstance(num_two, int):
+        raise TypeError("Both arguments must be integers.")
+    return num_one * num_two

solutions/tests/test_multiply_two_numbers.py

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+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+"""
+Test module for the multiply_two_numbers function.
+
+This module contains unit tests for the multiply_two_numbers function,
+including standard cases, boundary cases, and defensive tests.
+
+Created: 2025-01-04
+Author: Manezhah Mohmand
+"""
+
+import unittest
+
+from solutions.multiply_two_numbers import multiply_two_numbers
+
+
+class TestMultiplyTwoNumbers(unittest.TestCase):
+    """
+    Unit tests for the `multiply_two_numbers` function.
+
+    This test suite covers:
+        - Standard cases (e.g., positive and negative integers).
+        - Boundary cases (e.g., zero).
+        - Defensive tests for invalid inputs.
+    """
+
+    # Standard cases
+    def test_two_positive_numbers(self):
+        """It should return the product of two positive integers."""
+        self.assertEqual(multiply_two_numbers(2, 3), 6)
+
+    def test_two_negative_numbers(self):
+        """It should return the product of two negative integers."""
+        self.assertEqual(multiply_two_numbers(-2, -3), 6)
+
+    def test_positive_and_negative_number(self):
+        """It should return the product of a positive and a negative integer."""
+        self.assertEqual(multiply_two_numbers(-2, 3), -6)
+
+    # Boundary cases
+    def test_zero_with_positive_number(self):
+        """It should return 0 when one number is 0 and the other is positive."""
+        self.assertEqual(multiply_two_numbers(0, 5), 0)
+
+    def test_zero_with_negative_number(self):
+        """It should return 0 when one number is 0 and the other is negative."""
+        self.assertEqual(multiply_two_numbers(0, -7), 0)
+
+    # Defensive tests
+    def test_non_integer_input(self):
+        """It should raise a TypeError when the inputs are not integers."""
+        with self.assertRaises(TypeError):
+            multiply_two_numbers(2.5, 3)
+
+    def test_string_input(self):
+        """It should raise a TypeError when one or both inputs are strings."""
+        with self.assertRaises(TypeError):
+            multiply_two_numbers("2", "3")
+
+
+if __name__ == "__main__":
+    unittest.main()