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Organize tests to minimize factory creation, reduce duplication, and improve performance by chaining assertions and extracting common values.

Key practices:

Example:

# Instead of multiple examples creating many factories:
let!(:invite_unlimited) { Fabricate(:invite, user: user, max_uses: nil, created_at: 10.days.ago) }
let!(:invite_huge_max_uses) { Fabricate(:invite, max_uses: 100, created_at: 10.days.ago) }

# Use single example with chained expectations:
it 'processes invites correctly' do
  expect { subject.perform }
    .to change(Invite.where(max_uses: nil), :count).by(-1)
    .and change(Invite.where('max_uses > ?', retention_max_uses), :count).by(-1)
end

# Extract common datetime values:
let(:default_datetime) { DateTime.new(2024, 11, 28, 16, 20, 0) }

# Chain response assertions:
expect(response)
  .to have_http_status(403)
  .and have_content('error message')

This approach reduces test execution time, improves maintainability, and makes test intent clearer by grouping related assertions together.