refactor: restructure it for future method extensions

[wellwelwel]

This simple refactoring will help with the development of complementary methods such as it.todo, it.skip, etc.

• All changes in the it method are automatically reflected in the test method.

Related

• Allow to plan tests with todo flag #563
• Execution order is incorrect with async afterEach() and async test() #580 (comment)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.74%. Comparing base (1014e87) to head (0096f59).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #626   +/-   ##
=======================================
  Coverage   97.74%   97.74%           
=======================================
  Files          35       35           
  Lines        1996     1997    +1     
  Branches       22       22           
=======================================
+ Hits         1951     1952    +1     
  Misses         26       26           
  Partials       19       19           

Flag	Coverage Δ
linux	97.54% <100.00%> (+<0.01%)	⬆️
osx	97.82% <100.00%> (+<0.01%)	⬆️
windows	97.82% <100.00%> (+<0.01%)	⬆️

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