Add new synchronous assertions

[douglasdcm]

Add synchronous assertions 'HasKeyValue', 'MatchesRegex', 'HasSubset', 'IsSorted'

[Rahat-karim]

The Calculator class is imported twice from different paths. You should remove one of the imports to avoid redundancy.
from calculator import Calculator # Keep this one

Remove the second import

suggested code changes
import random
from calculator import Calculator
from examples.unit_test import calculator_transactions
from examples.unit_test.calculator import operations
from guara.transaction import Application
from guara import it

class TestCalculator:
def setup_method(self, method):
"""Set up the application instances for each test method."""
self._app = Application(Calculator)
self._calculator = Application(Calculator())

def test_add_returns_3_when_adding_1_and_2(self):
    """Test that adding 1 and 2 returns 3."""
    self._app.at(calculator_transactions.Add, a=1, b=2).asserts(it.IsEqualTo, 3)
    self._calculator.at(operations.Add, a=1, b=2).asserts(it.IsEqualTo, 3)

def test_add_returns_1_when_adding_1_and_0(self):
    """Test that adding 1 and 0 returns 1."""
    self._app.at(calculator_transactions.Add, a=1, b=0).asserts(it.IsEqualTo, 1)
    self._calculator.at(operations.Add, a=1, b=0).asserts(it.IsEqualTo, 1)

def test_subtract_returns_1_when_subtracting_1_from_2(self):
    """Test that subtracting 1 from 2 returns 1."""
    self._app.at(calculator_transactions.Subtract, a=2, b=1).asserts(it.IsEqualTo, 1)
    self._calculator.at(operations.Subtract, a=2, b=1).asserts(it.IsEqualTo, 1)

By implementing the suggested improvements, you can enhance readability, maintainability, and clarity of the tests. Always ensure that your tests are clear and provide meaningful feedback when they fail, as this will help in debugging and maintaining the code in the long run.
but the code is structured well for a testing framework.

[douglasdcm]

Thanks @Rahat-karim for the suggestions. I'll make the changes. Feel free to open new issues and PRs.