Invalid output when running TernaryToElvisRector

[JoyceBabu]

Subject	Details
Rector version	v0.6.0
PHP version	PHP 7.3.12
Full Command	composer/bin/rector process rector/test.php -vvv

Current Behaviour

I was trying to upgrade a very old code. TernaryToElvisRector converts

$val = ($a - $b) ? ($a - $b) : $c;

to
$val = ($a - $b) ? () : $c;

1 file with changes
===================

1) rector/test.php

    ---------- begin diff ----------
--- Original
+++ New
@@ -1,4 +1,4 @@
 <?php

-$val = ($a - $b) ? ($a - $b) : $c;
+$val = ($a - $b) ? () : $c;
    ----------- end diff -----------

Applied rules:

 * Rector\Php53\Rector\Ternary\TernaryToElvisRector

Minimal PHP Code Causing Issue

<?php

$val = ($a - $b) ? () : $c;

Expected Behaviour

$val = ($a - $b) ?: $c;

[TomasVotruba]

Thanks for the report.

Could you add test case to TernaryToElvisRectorTest?

[JoyceBabu]

How do I do that? I create a new test case file under

rector/packages/Php53/tests/Rector/Ternary/TernaryToElvisRector/Fixture/

[TomasVotruba]

Yes, basically.

With

// input content
-----
// expected changed code

[JoyceBabu]

Created PR #2423