String and List Utility Functions

This repository contains a set of Python functions that manipulate strings and lists in various ways. Your task is to implement and thoroughly test each function, including edge cases.

Functions to Implement

1. increment_string(strng)

• Description: Increment the numeric suffix of a string.

  • If the string ends with a number, increment that number by 1.
  • If the string does not end with a number, append 1.

• Examples:

  "foo" -> "foo1"
  "foobar23" -> "foobar24"
  "foo0042" -> "foo0043"
  "foo9" -> "foo10"
  "foo099" -> "foo100"

---

2. count_letters(string)

• Description: Count the occurrences of each letter in a string.

• Example:

  "aba" -> {"a": 2, "b": 1}

---

3. sum_consecutives(s)

• Description: Return a list of sums of each consecutive pair in a list.

• Example:

  [1, 2, 3] -> [3, 5]  # 1+2=3, 2+3=5

---

4. count_unique(string)

• Description: Count the number of unique words in a string.

• Should raise a ValueError if the input is not a string.

• Example:

  "no example ;)"

---

Instructions

1. Implement all functions in the main Python file (e.g., main.py).

2. Write comprehensive tests for all functions, including edge cases, such as:

   • Empty strings
   • Strings without numbers
   • Lists with a single element
   • Non-string inputs for count_unique

3. Place all test cases in a separate file:

   tests/test.py
   

4. Use Python's built-in unittest framework for testing. Example:

   import unittest
   from main import increment_string
   
   class TestIncrementString(unittest.TestCase):
       def test_increment_no_number(self):
           self.assertEqual(increment_string("foo"), "foo1")
   
       def test_increment_with_number(self):
           self.assertEqual(increment_string("foo009"), "foo010")
   
   if __name__ == "__main__":
       unittest.main()

5. Ensure all tests pass before submission.

---