[Fix] Fix test tokenizer

[liuwenran]

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Motivation

It seems that 'hello' will be added a ' ' in front of it when tokenizer decodes, it becomes ' hello'. So I replace 'hello' to others words.

Modification

Please briefly describe what modification is made in this PR.

BC-breaking (Optional)

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[codecov]

Codecov Report

All modified lines are covered by tests ✅

Files	Coverage Δ
mmagic/__init__.py	82.75% <100.00%> (ø)

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[LeoXing1996]

Nice bro! LGTM