tests: correction for https://bugs.php.net/bug.php?id=73959

Author: dg

tests/Database/Connection.getInsertId().postgre.phpt

@@ -21,10 +21,13 @@ $connection->query('
 ');
 
 $connection->query('INSERT INTO primarykey (prim) VALUES (5)');
-Assert::equal('0', $connection->getInsertId());
-
-$connection->query('INSERT INTO primarykey (prim) VALUES (6)');
-Assert::equal('0', $connection->getInsertId());
+if (PHP_VERSION_ID >= 70016) {
+	Assert::exception(function () use ($connection) {
+		$connection->getInsertId();
+	}, Nette\Database\DriverException::class);
+} else {
+	Assert::equal('0', $connection->getInsertId());
+}
 
 
 $connection->query('