primeiro commit com exercicios de Exercism realizados até esta data

python/collatz-conjecture/collatz_conjecture_test.py

@@ -0,0 +1,35 @@
+# These tests are auto-generated with test data from:
+# https://github.com/exercism/problem-specifications/tree/main/exercises/collatz-conjecture/canonical-data.json
+# File last updated on 2023-07-20
+
+import unittest
+
+from collatz_conjecture import (
+    steps,
+)
+
+
+class CollatzConjectureTest(unittest.TestCase):
+    def test_zero_steps_for_one(self):
+        self.assertEqual(steps(1), 0)
+
+    def test_divide_if_even(self):
+        self.assertEqual(steps(16), 4)
+
+    def test_even_and_odd_steps(self):
+        self.assertEqual(steps(12), 9)
+
+    def test_large_number_of_even_and_odd_steps(self):
+        self.assertEqual(steps(1000000), 152)
+
+    def test_zero_is_an_error(self):
+        with self.assertRaises(ValueError) as err:
+            steps(0)
+        self.assertEqual(type(err.exception), ValueError)
+        self.assertEqual(err.exception.args[0], "Only positive integers are allowed")
+
+    def test_negative_value_is_an_error(self):
+        with self.assertRaises(ValueError) as err:
+            steps(-15)
+        self.assertEqual(type(err.exception), ValueError)
+        self.assertEqual(err.exception.args[0], "Only positive integers are allowed")