test adding condorcet vote

include/Condorcet/Benchmarks/PairwiseUpdateOptimizationBench.php

@@ -0,0 +1,40 @@
+<?php
+
+declare(strict_types=1);
+
+namespace CondorcetPHP\Condorcet\Benchmarks;
+
+use CondorcetPHP\Condorcet\Election;
+use PhpBench\Attributes as Bench;
+
+class PairwiseUpdateOptimizationBench
+{
+    #[Bench\Warmup(1)]
+    #[Bench\Iterations(2)]
+    #[Bench\Revs(4)]
+    public function benchPairwiseOptimization(): void
+    {
+        $election = new Election;
+
+        $election->parseCandidates('A;B;C;D;E;F;G');
+
+        $election->parseVotes('
+          E > B > C > A > G * 2500
+          F > B > G > H > A * 2500
+          H > B > G > E > A * 2500
+          A = B = C > D > E = F > G * 2500
+          G = E = C > F > A * 2500
+          C > D = G > A > B * 2500
+       ');
+
+        $election->getWinner();
+
+        $vote = $election->addVote('A>B>C');
+
+        $election->removeVote($vote);
+
+        $vote->setRanking('C>B>A');
+
+        $election->getWinner();
+    }
+}