assertMigrationCount example

return $migrationCollection;
    }

    /** * @depends testDeactivate */
    public function testUninstallKeepUserData(MigrationCollection $migrationCollection): void
    {
        $migrationPlugin = $this->getMigrationTestPlugin();
        $this->pluginLifecycleService->uninstallPlugin($migrationPlugin, $this->context, true);
        $this->assertMigrationCount($migrationCollection, 4);
    }

    private function assertMigrationCount(MigrationCollection $migrationCollection, int $expectedCount): void
    {
        $connection = $this->getContainer()->get(Connection::class);

        /** @var MigrationSource $migrationSource */
        $migrationSource = ReflectionHelper::getPropertyValue($migrationCollection, 'migrationSource');

        $dbMigrations = $connection
            ->fetchAllAssociative(