Support multiple roulette roles per project

lib/gitlab/danger/teammate.rb

@@ -21,21 +21,21 @@ module Gitlab
 
       # Traintainers also count as reviewers
       def reviewer?(project, category)
-        capabilities(project) == "reviewer #{category}" || traintainer?(project, category)
+        capabilities(project).include?("reviewer #{category}") || traintainer?(project, category)
       end
 
       def traintainer?(project, category)
-        capabilities(project) == "trainee_maintainer #{category}"
+        capabilities(project).include?("trainee_maintainer #{category}")
       end
 
       def maintainer?(project, category)
-        capabilities(project) == "maintainer #{category}"
+        capabilities(project).include?("maintainer #{category}")
       end
 
       private
 
       def capabilities(project)
-        projects.fetch(project, '')
+        Array(projects.fetch(project, []))
       end
     end
   end

spec/lib/gitlab/danger/teammate_spec.rb

@@ -0,0 +1,39 @@
+# frozen_string_literal: true
+
+describe Gitlab::Danger::Teammate do
+  subject { described_class.new({ 'projects' => projects }) }
+  let(:projects) { { project => capabilities } }
+  let(:project) { double }
+
+  describe 'multiple roles project project' do
+    let(:capabilities) { ['reviewer backend', 'maintainer frontend', 'trainee_maintainer database'] }
+
+    it '#reviewer? supports multiple roles per project' do
+      expect(subject.reviewer?(project, 'backend')).to be_truthy
+    end
+
+    it '#traintainer? supports multiple roles per project' do
+      expect(subject.traintainer?(project, 'database')).to be_truthy
+    end
+
+    it '#maintainer? supports multiple roles per project' do
+      expect(subject.maintainer?(project, 'frontend')).to be_truthy
+    end
+  end
+
+  describe 'one role project project' do
+    let(:capabilities) { 'reviewer backend' }
+
+    it '#reviewer? supports one role per project' do
+      expect(subject.reviewer?(project, 'backend')).to be_truthy
+    end
+
+    it '#traintainer? supports one role per project' do
+      expect(subject.traintainer?(project, 'database')).to be_falsey
+    end
+
+    it '#maintainer? supports one role per project' do
+      expect(subject.maintainer?(project, 'frontend')).to be_falsey
+    end
+  end
+end