I can run simple workflow

tests/test_data_helper.py

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+from dataclasses import dataclass
+
+import pandas as pd
+import pytest
+
+from components.datagrid_new.components.DataGrid import DataGrid
+from core.Expando import Expando
+from core.settings_management import SettingsManager, MemoryDbEngine
+from utils.Datahelper import DataHelper
+
+TEST_GRID_ID = "testing_grid_id"
+TEST_GRID_KEY = ("RepoName", "TableName")
+
+
+@pytest.fixture()
+def settings_manager():
+  return SettingsManager(MemoryDbEngine())
+
+
+@pytest.fixture()
+def datagrid(session, settings_manager):
+  dg = DataGrid(session,
+                _id=TEST_GRID_ID,
+                settings_manager=settings_manager,
+                key=TEST_GRID_KEY,
+                boundaries={"height": 500, "width": 800})
+  
+  df = pd.DataFrame({
+      'Name': ['Alice', 'Bob'],
+      'Age': [20, 25],
+      'Is Student': [True, False],
+  })
+  
+  dg.init_from_dataframe(df, save_state=True)
+  return dg
+
+
+def test_i_can_get_data_as_dataframe(session, settings_manager, datagrid):
+  res = DataHelper.get(session, settings_manager, "RepoName", "TableName")
+  assert isinstance(res, pd.DataFrame)
+  assert res.equals(datagrid.get_dataframe())
+
+
+def test_i_can_get_data_as_dataclass(session, settings_manager, datagrid):
+  @dataclass
+  class DataclassTestClass:
+    name: str
+    age: int
+    is_student: bool
+  
+  res = DataHelper.get(session, settings_manager, "RepoName", "TableName", DataclassTestClass)
+  assert isinstance(res, list)
+  assert res == [
+      DataclassTestClass("Alice", 20, True),
+      DataclassTestClass("Bob", 25, False),
+  ]
+
+
+def test_i_can_get_data_as_expando(session, settings_manager, datagrid):
+  res = DataHelper.get(session, settings_manager, "RepoName", "TableName", Expando)
+  assert isinstance(res, list)
+  assert res == [
+      Expando({"name": "Alice", "age": 20, "is_student": True}),
+      Expando({"name": "Bob", "age": 25, "is_student": False})
+  ]
+  

tests/test_expando.py

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+import pytest
+
+from core.Expando import Expando
+
+
+def test_i_can_get_properties():
+  props = {"a": 10,
+           "b": {
+               "c": "value",
+               "d": 20
+           }}
+  dynamic = Expando(props)
+  
+  assert dynamic.a == 10
+  assert dynamic.b.c == "value"
+  
+  with pytest.raises(AttributeError):
+    assert dynamic.unknown == "some_value"
+
+
+def test_i_can_get():
+  props = {"a": 10,
+           "b": {
+               "c": "value",
+               "d": 20
+           }}
+  dynamic = Expando(props)
+  
+  assert dynamic.get("a") == 10
+  assert dynamic.get("b.c") == "value"
+  assert dynamic.get("unknown") is None
+
+
+def test_i_can_get_from_list():
+  props = {"a": [{"c": "value1", "d": 1}, {"c": "value2", "d": 2}]}
+  dynamic = Expando(props)
+  
+  assert dynamic.get("a.c") == ["value1", "value2"]
+
+
+def test_none_is_returned_when_get_from_list_and_property_does_not_exist():
+  props = {"a": [{"c": "value1", "d": 1},
+                 {"a": "value2", "d": 2}  # 'c' does not exist in the second row
+                 ]}
+  dynamic = Expando(props)
+  
+  assert dynamic.get("a.c") == ["value1"]
+
+
+def test_i_can_manage_none_values():
+  props = {"a": 10,
+           "b": None}
+  dynamic = Expando(props)
+  
+  assert dynamic.get("b.c") is None
+
+
+def test_i_can_manage_none_values_in_list():
+  props = {"a": [{"b": {"c": "value"}},
+                 {"b": None}
+                 ]}
+  dynamic = Expando(props)
+  
+  assert dynamic.get("a.b.c") == ["value"]
+
+
+def test_i_can_add_new_properties():
+  props = {"a": 10,
+           "b": 20}
+  dynamic = Expando(props)
+  dynamic["c"] = 30
+  
+  assert dynamic.a == 10
+  assert dynamic.b == 20
+  assert dynamic.c == 30