Add new code

solutions/tests/sum_range.py

@@ -0,0 +1,11 @@
+def sum_range(start, end):
+    """Calculates the sum of all integers from start to end, inclusive."""
+    # Ensure start is less than or equal to end
+    assert isinstance (start, int), "start must be an integer" 
+    assert isinstance (end, int), "end must be an integer"
+    if start > end:
+        start, end = end, start
+    total = 0
+    for number in range(start, end + 1):
+        total += number
+    return total

solutions/tests/test_sumrange.py

@@ -0,0 +1,34 @@
+import unittest
+from .sum_range import sum_range
+
+class TestSumRange(unittest.TestCase):
+    """Unit tests for the Sum_range function."""
+
+    def test_positive_range(self):
+        """Test with a normal positive range."""
+        self.assertEqual(sum_range(1, 5), 15)
+
+    def test_reversed_range(self):
+        """Test when start > end (reversed input)."""
+        self.assertEqual(sum_range(5, 1), 15)
+
+    def test_single_number(self):
+        """Test a range with a single number."""
+        self.assertEqual(sum_range(10, 10), 10)
+
+    def test_negative_range(self):
+        """Test a range that includes negative numbers."""
+        self.assertEqual(sum_range(-3, 3), 0)
+
+    def test_large_range(self):
+        """Test with a large range."""
+        self.assertEqual(sum_range(1, 100), 5050)
+
+    def test_large_range_reversed(self):
+        """Test with a large range."""
+        self.assertEqual(sum_range(100, 1), 5050)
+
+    def test_float_range(self):
+        """Test with a range that includes floats."""
+        with self.assertRaises(AssertionError):
+            sum_range(0.5, 3.5)