[Florian BURELLI (florian-burelli)]

Fixes #177

Problem

DataFactoryTestingFrameworkExpressionsEvaluator.evaluate serializes the iteration item with

state_iter_item_json = json.dumps(state.iteration_item) if state.iteration_item else None

so any falsy item is sent to the .NET evaluator as "no item" and item() raises StateIterationItemNotSetError. @range(0, n) therefore fails on its first iteration; the same happens for "", false, [] and {}.

Change

• Test state.iteration_item is not None instead. None is already what PipelineRunState uses to mean "no item" (create_iteration_scope keeps the parent item only when the new one is None), so the two sides now agree.

Tests

• test_data_factory_testing_framework_expression_evaluator.py: @item() evaluates to 0, "", False, [] and {} when the state holds those items. All 5 fail on main.
• test_for_each_activity.py: a ForEach over @range(0, 3) yields items [0, 1, 2]. Fails on main.

Full suite: 227 passed. Ruff check and format clean.

🤖 Generated with Claude Code

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