try

solutions/kgs_to_lbs.py

@@ -4,6 +4,8 @@
 
 """
 
+import unittest
+
 
 def kg_to_lbs(kg):
     """Converts a given weight from kilograms (kg) to pounds (lbs).
@@ -29,3 +31,23 @@ def kg_to_lbs(kg):
     if kg < 0:
         raise ValueError("Weight cannot be negative.")
     return kg * 2.20462
+
+
+class TestKgToLbs(unittest.TestCase):
+    def test_positive_conversion(self):
+        self.assertAlmostEqual(kg_to_lbs(1), 2.20462, places=5)
+        self.assertAlmostEqual(kg_to_lbs(5), 11.0231, places=4)
+
+    def test_zero_conversion(self):
+        self.assertEqual(kg_to_lbs(0), 0)
+
+    def test_negative_input(self):
+        with self.assertRaises(ValueError):
+            kg_to_lbs(-1)
+
+    def test_large_value(self):
+        self.assertAlmostEqual(kg_to_lbs(1000), 2204.62, places=2)
+
+
+if __name__ == "__main__":
+    unittest.main()