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49d78b9c - test: add unit tests for get_previous_step_or_raise (#1908) (#3218)

test: add unit tests for get_previous_step_or_raise (#1908) (#3218) * Tests are added at the bottom of test_simple_cache.py Tests are added at the bottom of test_simple_cache.py * style: fix import sort to satisfy ruff (I001) * style: use isort to fix import formatting for Ruff I001 * Update test_simple_cache.py * Update test_simple_cache.py * Update test_simple_cache.py * Update test_simple_cache.py * Update test_simple_cache.py * Add missing return type annotations [-> None]