--- /dev/null
+<?php
+
+namespace Drupal\entity_test\Entity;
+
+use Drupal\Core\Entity\EntityTypeInterface;
+use Drupal\Core\Field\BaseFieldDefinition;
+
+/**
+ * Defines a test entity class for testing default values.
+ *
+ * @ContentEntityType(
+ * id = "entity_test_default_value",
+ * label = @Translation("Test entity for default values"),
+ * base_table = "entity_test_default_value",
+ * entity_keys = {
+ * "id" = "id",
+ * "uuid" = "uuid",
+ * "bundle" = "type",
+ * "langcode" = "langcode"
+ * }
+ * )
+ */
+class EntityTestDefaultValue extends EntityTest {
+
+ /**
+ * {@inheritdoc}
+ */
+ public static function baseFieldDefinitions(EntityTypeInterface $entity_type) {
+ $fields = parent::baseFieldDefinitions($entity_type);
+
+ $fields['description'] = BaseFieldDefinition::create('shape')
+ ->setLabel(t('Some custom description'))
+ ->setDefaultValueCallback('entity_test_field_default_value');
+
+ return $fields;
+ }
+
+}