Issue #3273254 by Sutharsan: Cache tags missing

src/RadioactivityLazyBuilder.php

@@ -53,6 +53,7 @@ class RadioactivityLazyBuilder implements TrustedCallbackInterface {
    */
   public function buildReferencedValue(int $entityId, ?int $decimals = NULL, string $decimalSeparator = '.', string $thousandsSeparator = ','): array {
 
+    /** @var \Drupal\radioactivity\RadioactivityInterface $entity */
     $entity = $this->radioactivityStorage->load($entityId);
     if (empty($entity)) {
       return [];
@@ -65,7 +66,10 @@ class RadioactivityLazyBuilder implements TrustedCallbackInterface {
       $value = number_format($entity->getEnergy(), $decimals, $decimalSeparator, $thousandsSeparator);
     }
 
-    return ['#markup' => $value];
+    return [
+      '#markup' => $value,
+      '#cache' => ['tags' => $entity->getCacheTags()],
+    ];
   }
 
 }

tests/src/Unit/RadioactivityLazyBuilderTest.php

@@ -33,6 +33,8 @@ class RadioactivityLazyBuilderTest extends UnitTestCase {
     $radioactivityEntity = $this->prophesize(RadioactivityInterface::class);
     $radioactivityEntity->getEnergy()
       ->willReturn($energy);
+    $radioactivityEntity->getCacheTags()
+      ->willReturn(['radioactivity:1']);
 
     $radioactivityStorage = $this->prophesize(EntityStorageInterface::class);
     $radioactivityStorage->load(Argument::is(0))
@@ -83,10 +85,22 @@ class RadioactivityLazyBuilderTest extends UnitTestCase {
   public function providerBuildReferencedValue() {
     return [
       [0, 0, []],
-      [1, 0, ['#markup' => '9']],
-      [1, 1, ['#markup' => '9.1']],
-      [1, 2, ['#markup' => '9.12']],
-      [1, NULL, ['#markup' => '9.12345']],
+      [1, 0, [
+        '#markup' => '9',
+        '#cache' => ['tags' => ['radioactivity:1']],
+      ]],
+      [1, 1, [
+        '#markup' => '9.1',
+        '#cache' => ['tags' => ['radioactivity:1']],
+      ]],
+      [1, 2, [
+        '#markup' => '9.12',
+        '#cache' => ['tags' => ['radioactivity:1']],
+      ]],
+      [1, NULL, [
+        '#markup' => '9.12345',
+        '#cache' => ['tags' => ['radioactivity:1']],
+      ]],
     ];
   }