refactor: change from standar backend api to python library

tests/test_sum_with_image_reference.py

@@ -0,0 +1,75 @@
+import unittest
+
+from math_problems_structure.grade_1 import sum_with_image_reference
+
+
+class SumWithImageReferenceTest(unittest.TestCase):
+    def setUp(self) -> None:
+        self.first_picture = {
+            "id": "red-flower",
+            "name": "Red flower",
+            "image_path": "/images/red-flower.png",
+        }
+        self.second_picture = {
+            "id": "white-flower",
+            "name": "White flower",
+            "image_path": "/images/white-flower.png",
+        }
+
+    def test_creates_problem_with_one_correct_option(self) -> None:
+        problem = sum_with_image_reference(
+            first_quantity=5,
+            second_quantity=4,
+            first_description="flores rojas",
+            second_description="flores blancas",
+            common_object="flores",
+            first_picture=self.first_picture,
+            second_picture=self.second_picture,
+            option_count=3,
+            seed=1,
+        )
+
+        correct_options = [option for option in problem["options"] if option["is_correct"]]
+
+        self.assertEqual(
+            problem["question"],
+            "Hay 5 flores rojas y 4 flores blancas, ¿cuántas flores hay en total?",
+        )
+        self.assertEqual(problem["instructions"], "Escoge la imagen en la próxima página.")
+        self.assertEqual(problem["total"], 9)
+        self.assertEqual(len(problem["options"]), 3)
+        self.assertEqual(len(correct_options), 1)
+        self.assertEqual(correct_options[0]["quantity"], 9)
+        self.assertEqual(correct_options[0]["first_group"]["quantity"], 5)
+        self.assertEqual(correct_options[0]["second_group"]["quantity"], 4)
+
+        for option in problem["options"]:
+            first_group = option["first_group"]
+            second_group = option["second_group"]
+
+            self.assertEqual(option["quantity"], first_group["quantity"] + second_group["quantity"])
+            self.assertEqual(first_group["description"], "flores rojas")
+            self.assertEqual(second_group["description"], "flores blancas")
+            self.assertEqual(first_group["picture"], self.first_picture)
+            self.assertEqual(second_group["picture"], self.second_picture)
+
+    def test_raises_when_total_is_outside_option_range(self) -> None:
+        with self.assertRaisesRegex(
+            ValueError,
+            "option quantity range must include the correct total",
+        ):
+            sum_with_image_reference(
+                first_quantity=5,
+                second_quantity=4,
+                first_description="flores rojas",
+                second_description="flores blancas",
+                common_object="flores",
+                first_picture=self.first_picture,
+                second_picture=self.second_picture,
+                min_option_quantity=1,
+                max_option_quantity=8,
+            )
+
+
+if __name__ == "__main__":
+    unittest.main()