import os
import sys
import unittest

PROJECT_ROOT = os.path.realpath(os.path.join(os.path.dirname(__file__), "..", ".."))
MODULE_ROOT = os.path.join(PROJECT_ROOT, "modules")
sys.path.append(MODULE_ROOT)
from cda.py_string_to_float import PyStringToFloat

class TestPyStringToFloat(unittest.TestCase):
    def setUp(self):
        """Set up test data."""
        self.node = PyStringToFloat()
        self.test_cases = [
            ("3.14", 3.14),
            ("2.71", 2.71),
            ("0.577", 0.577),
            ("1.618", 1.618)
        ]

    def test_string_to_float(self):
        """Test converting a string to float."""
        for value, expected in self.test_cases:
            with self.subTest(value=value):
                retval = self.node.f(value=value)[0]
                self.assertEqual(retval, expected, f"Mismatch for value={value}")

if __name__ == "__main__":
    unittest.main()