[Fix] fix merge_args in tools/test.py

[Ben-Louis]

Motivation

Modification

BC-breaking (Optional)

Use cases (Optional)

Checklist

Before PR:

• I have read and followed the workflow indicated in the CONTRIBUTING.md to create this PR.
• Pre-commit or linting tools indicated in CONTRIBUTING.md are used to fix the potential lint issues.
• Bug fixes are covered by unit tests, the case that causes the bug should be added in the unit tests.
• New functionalities are covered by complete unit tests. If not, please add more unit tests to ensure correctness.
• The documentation has been modified accordingly, including docstring or example tutorials.

After PR:

• CLA has been signed and all committers have signed the CLA in this PR.

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (2ef98c3) 79.29% compared to head (1889698) 79.29%.

❗ Current head 1889698 differs from pull request most recent head badcfea. Consider uploading reports for the commit badcfea to get more accurate results

Additional details and impacted files

@@           Coverage Diff            @@
##           dev-1.x    #2431   +/-   ##
========================================
  Coverage    79.29%   79.29%           
========================================
  Files          248      248           
  Lines        14859    14859           
  Branches      2577     2577           
========================================
  Hits         11782    11782           
  Misses        2499     2499           
  Partials       578      578           

Flag	Coverage Δ
unittests	79.29% <ø> (ø)

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see 1 file with indirect coverage changes

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