test: ☑️ improve GraphQL route tests

[rodneylab]

Description

Add unit tests for deleting a draft via GraphQL route.

Type of change

• Test

How Has This Been Tested?

• cargo test run with all tests passing

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.94%. Comparing base (9fd31ae) to head (f83d4ef).

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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #14      +/-   ##
==========================================
+ Coverage   83.17%   85.94%   +2.76%     
==========================================
  Files           8        8              
  Lines         939     1060     +121     
==========================================
+ Hits          781      911     +130     
+ Misses        158      149       -9     

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