Implement flush in write_api

[minsungoh]

Proposed Changes

write_api is send data when it close or delete on batching mode. but i want to reuse same object. so i implement flush function as simply call on_complete

Checklist

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

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.52%. Comparing base (012c50a) to head (b322815).

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #678      +/-   ##
==========================================
+ Coverage   90.49%   90.52%   +0.03%     
==========================================
  Files          40       40              
  Lines        3534     3535       +1     
==========================================
+ Hits         3198     3200       +2     
+ Misses        336      335       -1     

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[bednar]

@minsungoh, thanks for your PR 👍. Please ensure all items in our Checklist are completed:

[minsungoh]

Sorry for late reply. i have problem in pytest. is there a auto config for test or should i input my own config? then what file should i change? there are config.ini, config.json, config.toml in tests/.

[bednar]

If you are using Linux or MacOS, you should be able to run tests following this guide - https://github.com/influxdata/influxdb-client-python?tab=readme-ov-file#local-tests

[minsungoh]

There's only mocking tests in tests/test_WriteApiBatching.py, so i made a class extends BaseTest for testing flush works. however, is there a better way to verify that record's saved on influxdb instead of sleep?