fix: pass falsy iteration items (0, "", false, [], {}) to item()

src/data_factory_testing_framework/_pythonnet/data_factory_testing_framework_expressions_evaluator.py

@@ -50,7 +50,7 @@ def evaluate(expression: str, state: PipelineRunState) -> Union[str, int, float,
 
         variables = {variable.name: variable.value for variable in state.variables}
 
-        state_iter_item_json = json.dumps(state.iteration_item) if state.iteration_item else None
+        state_iter_item_json = json.dumps(state.iteration_item) if state.iteration_item is not None else None
 
         result = evaluator.EvaluateExpression(
             expression,

tests/unit/functions/test_data_factory_testing_framework_expression_evaluator.py

@@ -132,6 +132,11 @@
         ),
         p("@item()", PipelineRunState(iteration_item="value"), "@item()", "value", id="item_reference"),
         p("@item() ", PipelineRunState(iteration_item="value"), "@item() ", "value", id="item_reference_with_ws"),
+        p("@item()", PipelineRunState(iteration_item=0), "@item()", 0, id="item_reference_zero"),
+        p("@item()", PipelineRunState(iteration_item=""), "@item()", "", id="item_reference_empty_string"),
+        p("@item()", PipelineRunState(iteration_item=False), "@item()", False, id="item_reference_false"),
+        p("@item()", PipelineRunState(iteration_item=[]), "@item()", [], id="item_reference_empty_list"),
+        p("@item()", PipelineRunState(iteration_item={}), "@item()", {}, id="item_reference_empty_dict"),
         p("@concat('a', 'b' )", PipelineRunState(), "@concat('a', 'b' )", "ab", id="function_call"),
         p(
             "@concat('https://example.com/jobs/', '123''', concat('&', 'abc,'))",

tests/unit/models/activities/control_activities/test_for_each_activity.py

@@ -79,3 +79,37 @@ def test_evaluated_raises_error_when_evaluated_value_is_not_a_list(evaluated_val
         ex_info.value.args[0]
         == "Iteration expression of Activity: 'ForEachActivity' does not evaluate to the expected type: 'list'."
     )
+
+
+def test_when_evaluate_child_activities_then_falsy_items_are_passed_as_item() -> None:
+    # Arrange
+    test_framework = TestFramework(TestFrameworkType.Fabric)
+    for_each_activity = ForEachActivity(
+        name="ForEachActivity",
+        typeProperties={
+            "items": DataFactoryElement("@range(0, 3)"),
+        },
+        activities=[
+            SetVariableActivity(
+                name="setVariable",
+                typeProperties={
+                    "variableName": "variable",
+                    "value": DataFactoryElement("@item()"),
+                },
+                depends_on=[],
+            ),
+        ],
+        depends_on=[],
+    )
+    state = PipelineRunState(
+        variables=[
+            PipelineRunVariable(name="variable", default_value=0),
+        ],
+    )
+
+    # Act
+    activities = test_framework.evaluate_activity(for_each_activity, state)
+
+    # Assert
+    items = [activity.type_properties["value"].result for activity in activities]
+    assert items == [0, 1, 2]