tests: adds some utils.helpers tests

tests/utils/test_helpers.py

@@ -0,0 +1,64 @@
+from pydase.utils.helpers import (
+    extract_dict_or_list_entry,
+    get_nested_value_from_DataService_by_path_and_key,
+)
+
+# Sample data for the tests
+data_sample = {
+    "attr1": {"type": "bool", "value": False, "readonly": False, "doc": None},
+    "class_attr": {
+        "type": "MyClass",
+        "value": {"sub_attr": {"type": "float", "value": 20.5}},
+    },
+    "list_attr": {
+        "type": "list",
+        "value": [
+            {"type": "int", "value": 0, "readonly": False, "doc": None},
+            {"type": "float", "value": 1.0, "readonly": False, "doc": None},
+        ],
+        "readonly": False,
+    },
+}
+
+
+# Tests for extract_dict_or_list_entry
+def test_extract_dict_with_valid_list_index() -> None:
+    result = extract_dict_or_list_entry(data_sample, "list_attr[1]")
+    assert result == {"type": "float", "value": 1.0, "readonly": False, "doc": None}
+
+
+def test_extract_dict_without_list_index() -> None:
+    result = extract_dict_or_list_entry(data_sample, "attr1")
+    assert result == {"type": "bool", "value": False, "readonly": False, "doc": None}
+
+
+def test_extract_dict_with_invalid_key() -> None:
+    result = extract_dict_or_list_entry(data_sample, "attr_not_exist")
+    assert result is None
+
+
+def test_extract_dict_with_invalid_list_index() -> None:
+    result = extract_dict_or_list_entry(data_sample, "list_attr[5]")
+    assert result is None
+
+
+# Tests for get_nested_value_from_DataService_by_path_and_key
+def test_get_nested_value_with_default_key() -> None:
+    result = get_nested_value_from_DataService_by_path_and_key(
+        data_sample, "list_attr[0]"
+    )
+    assert result == 0
+
+
+def test_get_nested_value_with_custom_key() -> None:
+    result = get_nested_value_from_DataService_by_path_and_key(
+        data_sample, "class_attr.sub_attr", "type"
+    )
+    assert result == "float"
+
+
+def test_get_nested_value_with_invalid_path() -> None:
+    result = get_nested_value_from_DataService_by_path_and_key(
+        data_sample, "class_attr.nonexistent_attr"
+    )
+    assert result is None