Modify Knockout tests

Modify `Knockout` tests so that playoff matches (incomplete levels of the binary tree) are played by the last participants.

tournaments/tournaments/tests.py

@@ -730,8 +730,8 @@ def test_create_fixtures_5participants(self):
         # Verify fixtures.
         actual_fixtures = self.group_fixtures_by_level(mode)
         expected_fixtures = {
-            0: [(5, 1)],
-            1: [(None, 3), (4, 2)],
+            0: [(5, 4)],
+            1: [(None, 2), (3, 1)],
             2: [(None, None)]
         }
         self.assertEqual(actual_fixtures, expected_fixtures)
@@ -745,12 +745,39 @@ def test_create_fixtures_6participants(self):
         # Verify fixtures.
         actual_fixtures = self.group_fixtures_by_level(mode)
         expected_fixtures = {
-            0: [(5, 2), (6, 1)],
-            1: [(None, None), (4, 3)],
+            0: [(5, 4), (6, 3)],
+            1: [(None, None), (2, 1)],
+            2: [(None, None)]
+        }
+        self.assertEqual(actual_fixtures, expected_fixtures)
+
+    def test_create_fixtures_8participants(self):
+        mode = Knockout.objects.create(tournament = self.tournament)
+        mode.create_fixtures(self.participants[:8])
+
+        # Verify fixtures.
+        actual_fixtures = self.group_fixtures_by_level(mode)
+        expected_fixtures = {
+            0: [(5, 4), (6, 3), (7, 2), (8, 1)],
+            1: [(None, None), (None, None)],
             2: [(None, None)]
         }
         self.assertEqual(actual_fixtures, expected_fixtures)
 
+    def test_create_fixtures_9participants(self):
+        mode = Knockout.objects.create(tournament = self.tournament)
+        mode.create_fixtures(self.participants[:9])
+
+        # Verify fixtures.
+        actual_fixtures = self.group_fixtures_by_level(mode)
+        expected_fixtures = {
+            0: [(9, 8)],
+            1: [(None, 4), (5, 3), (6, 2), (7, 1)],
+            2: [(None, None), (None, None)],
+            3: [(None, None)]
+        }
+        self.assertEqual(actual_fixtures, expected_fixtures)
+
     def test_check_fixture(self):
         mode = self.test_create_fixtures_2participants()
         fixture = mode.fixtures.get()