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solutions/tests/triangle_challenge/test_triangle_side.py

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+"""
+Unit test for the Triangular number sequence.
+
+This module runs 6 unit tests to verify the code can successfully calculate
+The nth triangle side of the triangular number sequence
+This test will include
+- Basic cases: Test will calculate basic positive correct inputs
+- Defensive cases: Test will include: Inputs that may create an error
+
+Created on 2025-01-06
+Author: Adolfo Fumero
+"""
+
+import unittest
+
+from solutions.triangle_challenge.main import triangle_side
+
+
+def triangle(n):
+    """
+    Calculate the nth triangular number
+
+    Parameters:
+    n(int): The position in the triangular number sequence.
+
+    Returns:
+    int: The nth triangular number
+
+    """
+    if n < 1:
+        return "Input must be a positive integer."
+    return n * (n + 1) // 2
+
+class TestTriangleFunction(unittest.TestCase):
+    def test1(self):
+        """Test valid positive integer input for the 1st number"""
+        self.assertEqual(triangle_side(1), 1)  # First triangular number
+
+    def test2(self):
+        """Test valid positive integer inputs for the 5th number"""
+        self.assertEqual(triangle_side(5), 15)  # 1 + 2 + 3 + 4 + 5 = 15
+
+    def test3(self):
+        """Test valid positive integer inputs for the 10th number"""
+        self.assertEqual(triangle_side(10), 55)  # Sum of first 10 integers
+
+    def test4(self):
+        """Test input of 0."""
+        self.assertEqual(triangle_side(0), "Input must be a positive integer.")
+
+    def test5(self):
+        """Test negative integer input."""
+        self.assertEqual(triangle_side(-5), "Input must be a positive integer.")
+
+    def test6(self):
+        """Test a large input value."""
+        self.assertEqual(triangle_side(100), 5050)  # Sum of first 100 integers