--- /dev/null
+<?php
+
+namespace Drupal\Tests\datetime\Unit\Plugin\migrate\field;
+
+use Drupal\datetime\Plugin\migrate\field\DateField;
+use Drupal\migrate\MigrateException;
+use Drupal\Tests\UnitTestCase;
+
+/**
+ * @group migrate
+ */
+class DateFieldTest extends UnitTestCase {
+
+ /**
+ * @var \Drupal\migrate_drupal\Plugin\MigrateFieldInterface
+ */
+ protected $plugin;
+
+ /**
+ * @var \Drupal\migrate\Plugin\MigrationInterface
+ */
+ protected $migration;
+
+ /**
+ * Tests an Exception is thrown when the field type is not a known date type.
+ */
+ public function testUnknownDateType() {
+ $this->migration = $this->prophesize('Drupal\migrate\Plugin\MigrationInterface')->reveal();
+ $this->plugin = new DateField([], '', []);
+
+ $this->setExpectedException(MigrateException::class, "Field field_date of type 'timestamp' is an unknown date field type.");
+ $this->plugin->processFieldValues($this->migration, 'field_date', ['type' => 'timestamp']);
+ }
+
+}