fix: flaky test

[NguyenHoangSon96]

Closes Issue

Proposed Changes

• This test case "test_write_polars_batching" will sometimes throw an error because the post_write() wasn't called when the mock test was run. The batching process is asynchronous.

• I changed self.client._write_api._write_service.post_write.call_args[1]['body'] to assert_called_once_with() because the error thrown by this method is clearer.

• I use this script to test test_write_polars_batching() automatically
  auto_test.txt

Before the fix

After the fix

Checklist

• CHANGELOG.md updated
• Rebased/mergeable
• A test has been added if appropriate
• Tests pass
• Commit messages are conventional
• Sign CLA (if not already signed)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 61.92%. Comparing base (4317ade) to head (981ec4e).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #126   +/-   ##
=======================================
  Coverage   61.92%   61.92%           
=======================================
  Files          33       33           
  Lines        2135     2135           
=======================================
  Hits         1322     1322           
  Misses        813      813           

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[jansimonb]

LGTM