Enhance test_append and test_array_creation
1.  add negative tests
2.  add more test cases
3.  refactor test code

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1. Create test class for negative testing
2. Refactor out test functions
3. Use parameterize

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1. update run_test name to check_array_method
2. use parameterize for step zero cases of arange

1. add pytest.mark.xfail for cases with expected failure
2. Small Fix: replace Assert with raising ValueError in deferred.py

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