Optimize factory usage for label serializer

Marcos Rocharequested to merge
mc_rocha-optimize-factory-usage-label-serializer-spec into master

What does this MR do and why?

This MR replaces create with build_stubbed in spec/serializers/label_serializer_spec.rb to optimize the factory usage as recommended in our handbook. This spec is part of the list .rubocop_todo/rspec/factory_bot/avoid_create.yml. It was verified that database persistence is not needed using the factory doctor command FDOC=1 bin/rspec spec/serializers/label_serializer_spec.rb.

Factory Usage Optimization Results

Before optimization:

  • Factory time: 2.121s (6.44% of total time)

After optimization:

  • Factory time: 0.046s (0.27% of total time)

🚀 Improvement:

  • Factory time reduced by: 2.075s
  • Factory time percentage reduced by: 6.17%
  • Overall factory usage improvement: 97.8%

Factory Doctor Output 

[TEST PROF INFO] FactoryDoctor enabled (event: "sql.active_record", threshold: 0.01)
Run options: include {:focus=>true}

All examples were filtered out; ignoring {:focus=>true}
==> Using precompiled Gitaly binaries from cache

Test environment set up in 1.2377839999971911 seconds
...[TEST PROF INFO] FactoryDoctor report

Total (potentially) bad examples: 3
Total wasted time: 00:02.281

LabelSerializer (./spec/serializers/label_serializer_spec.rb:5) (22 records created, 00:02.281)
  serializes the label object (./spec/serializers/label_serializer_spec.rb:18) – 6 records created, 00:01.406
  serializes the array of labels (./spec/serializers/label_serializer_spec.rb:27) – 10 records created, 00:00.643
  serializes only attributes used for appearance (./spec/serializers/label_serializer_spec.rb:39) – 6 records created, 00:00.231




Finished in 14.4 seconds (files took 15 seconds to load)
3 examples, 0 failures

[TEST PROF INFO] Time spent in factories: 00:02.287 (12.39% of total time)

Factory time before the update 

[TEST PROF INFO] Time spent in factories: 00:02.121 (6.44% of total time)

Factory time after update 

[TEST PROF INFO] Time spent in factories: 00:00.046 (0.27% of total time)

This MR also adds the missing feature category in this spec.

References

Relates to: #378910.

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