It looks like the chapter content didn’t come through. Could you please paste the full text of the chapter (including Task 3) so I can summarize the programming concept and identify a general usage domain?

Workbook

import unittest
import json


class TestTask(unittest.TestCase):
    @classmethod
    def setUpClass(cls):
        with open("payload.json") as f:
            data = json.load(f)
        cls.sheet = next(iter(data["sheets"].values()))

    def _cell(self, row, col):
        return (
            self.sheet.get("cellData", {})
            .get(str(row), {})
            .get(str(col))
        )

    def test_c1_formula(self):
        cell = self._cell(0, 2)
        self.assertIsNotNone(
            cell, "Cell C1 must contain formula =A1+B1 or value 300"
        )
        self.assertTrue(
            cell.get("f") == "=A1+B1" or cell.get("v") == 300,
            "Cell C1 must contain formula =A1+B1 or value 300",
        )

    def test_b2_value(self):
        cell = self._cell(1, 1)
        self.assertIsNotNone(cell, "Cell B2 must have value 75")
        self.assertEqual(cell.get("v"), 75, "Cell B2 must have value 75")

    def test_c2_formula(self):
        cell = self._cell(1, 2)
        self.assertIsNotNone(
            cell, "Cell C2 must contain formula =A2+B2 or value 125"
        )
        self.assertTrue(
            cell.get("f") == "=A2+B2" or cell.get("v") == 125,
            "Cell C2 must contain formula =A2+B2 or value 125",
        )


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

test_main.py

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with task3

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