refactor: extract common test code for creating table

[gohalo]

Description

Use a common test function to create fixture Table without running config validation.

How are the changes test-covered

• N/A
• Automated tests (unit and/or integration tests)
• Manual tests
  • Details are described below

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.77%. Comparing base (01ef2fc) to head (328db23).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #117   +/-   ##
=======================================
  Coverage   87.77%   87.77%           
=======================================
  Files          14       14           
  Lines         728      728           
=======================================
  Hits          639      639           
  Misses         89       89           

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[xushiyan]

@gohalo thanks for the PR. i've decided to refactor #118 instead which is easier to do. Can you pls update this PR to keep the test code refactoring change? then we can merge this.