Make sure SET maintainer is required when MR author is an SET

That will improve the reviewer roulette behavior for SETs.
Signed-off-by: Rémy Coutable <remy@rymai.me>

spec/tooling/danger/roulette_spec.rb

@@ -53,7 +53,7 @@ RSpec.describe Tooling::Danger::Roulette do
       'username' => 'software-engineer-in-test',
       'name' => 'Software Engineer in Test',
       'role' => 'Software Engineer in Test, Create:Source Code',
-      'projects' => { 'gitlab' => 'reviewer qa', 'gitlab-qa' => 'maintainer' },
+      'projects' => { 'gitlab' => 'maintainer qa', 'gitlab-qa' => 'maintainer' },
       'available' => true,
       'tz_offset_hours' => 2.0
     )
@@ -176,8 +176,24 @@ RSpec.describe Tooling::Danger::Roulette do
       context 'when change contains QA category' do
         let(:categories) { [:qa] }
 
+        it 'assigns QA maintainer' do
+          expect(spins).to eq([described_class::Spin.new(:qa, nil, software_engineer_in_test, false, false)])
+        end
+      end
+
+      context 'when change contains QA category and another category' do
+        let(:categories) { [:backend, :qa] }
+
+        it 'assigns QA maintainer' do
+          expect(spins).to eq([described_class::Spin.new(:backend, engineering_productivity_reviewer, backend_maintainer, false, false), described_class::Spin.new(:qa, nil, software_engineer_in_test, :maintainer, false)])
+        end
+
+        context 'and author is an SET' do
+          let!(:author) { Tooling::Danger::Teammate.new('username' => software_engineer_in_test.username) }
+
           it 'assigns QA reviewer' do
-          expect(spins).to eq([described_class::Spin.new(:qa, software_engineer_in_test, nil, false, false)])
+            expect(spins).to eq([described_class::Spin.new(:backend, engineering_productivity_reviewer, backend_maintainer, false, false), described_class::Spin.new(:qa, nil, nil, false, false)])
+          end
         end
       end
 

spec/tooling/danger/teammate_spec.rb

@@ -2,6 +2,7 @@
 
 require_relative '../../../tooling/danger/teammate'
 require 'active_support/testing/time_helpers'
+require 'rspec-parameterized'
 
 RSpec.describe Tooling::Danger::Teammate do
   using RSpec::Parameterized::TableSyntax
@@ -48,6 +49,13 @@ RSpec.describe Tooling::Danger::Teammate do
   context 'when having multiple capabilities' do
     let(:capabilities) { ['reviewer backend', 'maintainer frontend', 'trainee_maintainer qa'] }
 
+    it '#any_capability? returns true if the person has any capability for the category in the given project' do
+      expect(subject.any_capability?(project, :backend)).to be_truthy
+      expect(subject.any_capability?(project, :frontend)).to be_truthy
+      expect(subject.any_capability?(project, :qa)).to be_truthy
+      expect(subject.any_capability?(project, :engineering_productivity)).to be_falsey
+    end
+
     it '#reviewer? supports multiple roles per project' do
       expect(subject.reviewer?(project, :backend, labels)).to be_truthy
     end

tooling/danger/roulette.rb

@@ -39,7 +39,7 @@ module Tooling
           case spin.category
           when :qa
             # MR includes QA changes, but also other changes, and author isn't an SET
-            if categories.size > 1 && !team_mr_author&.reviewer?(project, spin.category, [])
+            if categories.size > 1 && !team_mr_author&.any_capability?(project, spin.category)
               spin.optional_role = :maintainer
             end
           when :test

tooling/danger/teammate.rb

@@ -33,6 +33,10 @@ module Tooling
         projects&.has_key?(name)
       end
 
+      def any_capability?(project, category)
+        capabilities(project).any? { |capability| capability.end_with?(category.to_s) }
+      end
+
       def reviewer?(project, category, labels)
         has_capability?(project, category, :reviewer, labels)
       end