Correct position for :single_team matches

app/services/match_service.rb

@@ -45,12 +45,14 @@ class MatchService
     end
 
     # the start point is to compensate for all the teams that are already within a "normal" match
-    startpoint = matches.size
+    i = team_offset = matches.size
     until matches.size >= needed_games
       # while we do not have enough matches in general we need to fill the array with "single team" matches
-      i = matches.size + startpoint
-      match = Match.new state: :single_team, position: i, match_scores: [MatchScore.create(team: teams[i])]
+      match = Match.new state: :single_team,
+                        position: i,
+                        match_scores: [MatchScore.create(team: teams[i + team_offset])]
       matches << match
+      i += 1
     end
     matches
   end

spec/services/match_service_spec.rb

@@ -117,5 +117,16 @@ RSpec.describe MatchService do
     it 'raises an exception for for 0 teams' do
       expect { MatchService.generate_matches([]) }. to raise_error 'Cannot generate Matches without teams'
     end
+
+    it 'generates matches with consecutive positions' do
+      MatchService.generate_matches(create_list(:team, 7)).sort_by(&:position).each_with_index do |match, i|
+        expect(match.position).to eq(i)
+      end
+    end
+
+    it 'places all given teams into the matches exactly once' do
+      teams = create_list(:team, 11)
+      expect(MatchService.generate_matches(teams).map(&:teams).flatten).to match_array(teams)
+    end
   end
 end