diff --git a/tests/s100-reselection-final-growth-check.php b/tests/s100-reselection-final-growth-check.php
new file mode 100644
index 00000000..0e038494
--- /dev/null
+++ b/tests/s100-reselection-final-growth-check.php
@@ -0,0 +1,212 @@
+<?php
+
+declare(strict_types=1);
+
+use sammo\CentennialAllStarGrowthService;
+use sammo\DB;
+use sammo\Event\Action\AdvanceCentennialAllStar;
+use sammo\GameConst;
+use sammo\General;
+use sammo\Json;
+use sammo\KVStorage;
+use sammo\RootDB;
+
+const APP_ROOT = '/var/www/html';
+const TEST_ENV = ['startyear' => 180, 'year' => 195, 'month' => 1];
+const STAT_KEYS = ['leadership', 'strength', 'intel'];
+const DEX_KEYS = ['dex1', 'dex2', 'dex3', 'dex4', 'dex5'];
+
+$_SERVER['REMOTE_ADDR'] = '127.0.0.1';
+$_SERVER['REQUEST_URI'] = '/s100-reselection-final-growth-check';
+
+require APP_ROOT . '/hwe/lib.php';
+require APP_ROOT . '/hwe/func.php';
+
+$mode = $argv[1] ?? '';
+$username = $argv[2] ?? 's100user01';
+$snapshotPath = $argv[3] ?? '/tmp/s100-reselection-final-growth.json';
+if (!in_array($mode, ['prepare', 'verify'], true)) {
+    throw new InvalidArgumentException('Mode must be prepare or verify');
+}
+if (preg_match('/^s100user[0-9]{2}$/', $username) !== 1) {
+    throw new InvalidArgumentException('Username must match s100userNN');
+}
+
+$db = DB::db();
+$owner = RootDB::db()->queryFirstField(
+    'SELECT no FROM member WHERE id=%s',
+    $username
+);
+if ($owner === null) {
+    throw new RuntimeException("No member for {$username}");
+}
+$generalID = $db->queryFirstField('SELECT no FROM general WHERE owner=%i', $owner);
+if ($generalID === null) {
+    throw new RuntimeException("No general for owner {$owner}");
+}
+
+if ($mode === 'prepare') {
+    $gameStor = KVStorage::getStorage($db, 'game_env');
+    $gameStor->setValue('year', TEST_ENV['year']);
+    $gameStor->setValue('month', TEST_ENV['month']);
+
+    $eventResult = (new AdvanceCentennialAllStar())->run(TEST_ENV);
+    $general = General::createObjFromDB((int) $generalID);
+    $beforeGrowth = readGeneralState($general);
+
+    $statGrowthKey = null;
+    foreach (STAT_KEYS as $key) {
+        if ((int) $general->getVar($key) < GameConst::$maxLevel) {
+            $statGrowthKey = $key;
+            break;
+        }
+    }
+    if ($statGrowthKey === null) {
+        throw new RuntimeException('No stat can receive an organic level-up');
+    }
+    $general->increaseVar(
+        "{$statGrowthKey}_exp",
+        GameConst::$upgradeLimit
+    );
+    if (!$general->checkStatChange()) {
+        throw new RuntimeException('Organic stat level-up did not occur');
+    }
+
+    $general->addDex($general->getCrewTypeObj(), 12345, false);
+    $general->setAuxVar('next_change', '2000-01-01 00:00:00');
+    $general->applyDB($db);
+
+    $afterGrowth = readGeneralState($general);
+    $snapshot = [
+        'username' => $username,
+        'generalID' => (int) $generalID,
+        'eventResult' => $eventResult,
+        'statGrowthKey' => $statGrowthKey,
+        'beforeGrowth' => $beforeGrowth,
+        'afterGrowth' => $afterGrowth,
+    ];
+    if (file_put_contents(
+        $snapshotPath,
+        Json::encode($snapshot, Json::PRETTY) . PHP_EOL
+    ) === false) {
+        throw new RuntimeException("Could not write {$snapshotPath}");
+    }
+    chmod($snapshotPath, 0600);
+    printf(
+        "Prepared final-growth reselection: user=%s target=%s stat=%s dexDelta=%d\n",
+        $username,
+        $afterGrowth['targetId'],
+        $statGrowthKey,
+        array_sum($afterGrowth['dex']) - array_sum($beforeGrowth['dex'])
+    );
+    exit(0);
+}
+
+$snapshot = Json::decode((string) file_get_contents($snapshotPath));
+$general = General::createObjFromDB((int) $generalID);
+$actual = readGeneralState($general);
+$targetInfoRaw = $db->queryFirstField(
+    'SELECT info FROM select_pool WHERE general_id=%i',
+    $generalID
+);
+if ($targetInfoRaw === null) {
+    throw new RuntimeException('Reselected target is not assigned to the general');
+}
+$targetInfo = Json::decode($targetInfoRaw);
+$oldTargetId = $snapshot['afterGrowth']['targetId'];
+$newTargetId = (string) ($targetInfo['uniqueName'] ?? '');
+if ($newTargetId === '' || $newTargetId === $oldTargetId) {
+    throw new RuntimeException('Chromium reselection did not change the target');
+}
+if ($actual['targetId'] !== $newTargetId) {
+    throw new RuntimeException('General aux target does not match the assigned pool target');
+}
+
+$expectedStats = CentennialAllStarGrowthService::calculateUserCurrentTargetStats(
+    $targetInfo,
+    TEST_ENV
+);
+$expectedDex = [];
+foreach (STAT_KEYS as $key) {
+    $organic = max(
+        0,
+        (int) $snapshot['afterGrowth']['stats'][$key]
+            - (int) $snapshot['afterGrowth']['granted'][$key]
+    );
+    $expectedStats[$key] = max($organic, $expectedStats[$key]);
+    assertSameValue($expectedStats[$key], $actual['stats'][$key], $key);
+    assertSameValue(
+        $actual['stats'][$key] - $organic,
+        $actual['granted'][$key],
+        "{$key} event grant"
+    );
+}
+foreach (DEX_KEYS as $idx => $key) {
+    $organic = max(
+        0,
+        (int) $snapshot['afterGrowth']['dex'][$key]
+            - (int) $snapshot['afterGrowth']['granted'][$key]
+    );
+    $targetFloor = CentennialAllStarGrowthService::calculateDexTargetFloor(
+        (int) ($targetInfo['dex'][$idx] ?? 0),
+        TEST_ENV
+    );
+    $expectedDex[$key] = max($organic, $targetFloor);
+    assertSameValue($expectedDex[$key], $actual['dex'][$key], $key);
+    assertSameValue($targetFloor, $actual['dexFloor'][$key], "{$key} floor");
+    assertSameValue(
+        $actual['dex'][$key] - $organic,
+        $actual['granted'][$key],
+        "{$key} event grant"
+    );
+}
+
+printf(
+    "Verified final-growth reselection: user=%s old=%s new=%s stats=%s dex=%s\n",
+    $username,
+    $oldTargetId,
+    $newTargetId,
+    Json::encode($actual['stats']),
+    Json::encode($actual['dex'])
+);
+
+/**
+ * @return array{
+ *   targetId:string,
+ *   stats:array<string,int>,
+ *   dex:array<string,int>,
+ *   granted:array<string,int>,
+ *   dexFloor:array<string,int>
+ * }
+ */
+function readGeneralState(General $general): array
+{
+    $aux = $general->getAuxVar(CentennialAllStarGrowthService::AUX_KEY);
+    if (!is_array($aux)) {
+        throw new RuntimeException('Centennial growth ledger is missing');
+    }
+    $stats = [];
+    foreach (STAT_KEYS as $key) {
+        $stats[$key] = (int) $general->getVar($key);
+    }
+    $dex = [];
+    foreach (DEX_KEYS as $key) {
+        $dex[$key] = (int) $general->getVar($key);
+    }
+    return [
+        'targetId' => (string) ($aux['targetId'] ?? ''),
+        'stats' => $stats,
+        'dex' => $dex,
+        'granted' => $aux['granted'] ?? [],
+        'dexFloor' => $aux['dexFloor'] ?? [],
+    ];
+}
+
+function assertSameValue(int $expected, int $actual, string $label): void
+{
+    if ($actual !== $expected) {
+        throw new RuntimeException(
+            "{$label}: expected {$expected}, got {$actual}"
+        );
+    }
+}