Test detection of deprecated constants

Author: mglaman

tests/fixtures/drupal/modules/phpstan_fixtures/src/DeprecatedGlobalConstants.php

@@ -0,0 +1,11 @@
+<?php
+
+namespace Drupal\phpstan_fixtures;
+
+class DeprecatedGlobalConstants {
+    public function test() {
+        $date = new \DateTime();
+        $date->setTimezone(new \DateTimeZone(DATETIME_STORAGE_TIMEZONE));
+        $date->format(DATETIME_DATE_STORAGE_FORMAT);
+    }
+}

tests/src/DeprecationRulesTest.php

@@ -38,5 +38,13 @@ public function dataDeprecatedSamples(): \Generator
 in Drupal 8.0.0, will be removed before Drupal 9.0.0.'
             ]
         ];
+        yield [
+            __DIR__ . '/../fixtures/drupal/modules/phpstan_fixtures/src/DeprecatedGlobalConstants.php',
+            2,
+            [
+                'Call to deprecated constant DATETIME_STORAGE_TIMEZONE.',
+                'Call to deprecated constant DATETIME_DATE_STORAGE_FORMAT.',
+            ]
+        ];
     }
 }