decimal to binary challenge

solutions/decimal_to_binary.py

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+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+"""
+A function to convert decimal numbers to binary.
+
+Created on 1/1/2025
+@author: Heba Shaheen
+"""
+
+
+def decimal_to_binary(n: int) -> str:
+    """Give the binary number for a decimal
+
+    Args:
+        n (int): Decimal number to be converted
+
+    Returns:
+        str: Binary representation of the decimal number
+
+    Raises:
+        AssertionError: if the input is not an integer
+
+    >>> decimal_to_binary(10)
+    "1010"
+
+    >>> decimal_to_binary(20)
+    "10100"
+
+    >>> decimal_to_binary(255)
+    "11111111"
+    """
+    # Handle the edge case for 0
+    assert isinstance(n, int), "The input should be integer"
+    assert n >= 0, "Give a positive input"
+    if n == 0:
+        return "0"
+    binary = ""
+    while n > 0:
+        binary = str(n % 2) + binary
+        n //= 2
+    return binary

solutions/tests/test_decimal_to_binary.py

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+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+"""
+Unit tests for decimal_to_binary function.
+
+@author: Heba Shaheen
+"""
+
+import unittest
+
+from ..decimal_to_binary import decimal_to_binary
+
+
+class TestBinary(unittest.TestCase):
+    """Unit tests for decimal_to_binary function."""
+
+    def test_number_0(self):
+        """It should give the binary"""
+        actual = decimal_to_binary(0)
+        expected = "0"
+        self.assertEqual(actual, expected)
+
+    def test_number_2(self):
+        """It should give the binary"""
+        actual = decimal_to_binary(2)
+        expected = "10"
+        self.assertEqual(actual, expected)
+
+    def test_number_5(self):
+        """It should give the binary"""
+        actual = decimal_to_binary(5)
+        expected = "101"
+        self.assertEqual(actual, expected)
+
+    def test_number_15(self):
+        """It should give the binary"""
+        actual = decimal_to_binary(15)
+        expected = "1111"
+        self.assertEqual(actual, expected)
+
+    def test_non_integer_input(self):
+        """It should raise an assertion error if the argument is not an integer"""
+        with self.assertRaises(AssertionError):
+            decimal_to_binary("1")
+
+    def test_non_negative_input(self):
+        """It should raise an assertion error if the argument is negative"""
+        with self.assertRaises(AssertionError):
+            decimal_to_binary(-3)