Update to test executable to always display deprecations by default

test

@@ -32,6 +32,7 @@ $cmd = implode(' ', [
     '-d xdebug.mode=coverage,develop,trace',
     escapeshellarg(__DIR__ . '/vendor/bin/phpunit'),
     '--configuration tests/phpunit.xml',
-    ...$argv
+    ...$argv,
+    '--display-deprecations'
 ]);
 passthru($cmd);