Issue #3011069 by Jo Fitzgerald, quietone: Incomplete testing for format_date process plugin

core/modules/migrate/src/Plugin/migrate/process/FormatDate.php

@@ -136,7 +136,7 @@ public function transform($value, MigrateExecutableInterface $migrate_executable
       throw new MigrateException(sprintf('Format date plugin could not transform "%s" using the format "%s". Error: %s', $value, $fromFormat, $e->getMessage()), $e->getCode(), $e);
     }
     catch (\UnexpectedValueException $e) {
-      throw new MigrateException(sprintf('Format date plugin could not transform "%s" using the format "%s". Error: %s', $value, $fromFormat, $e->getMessage()), $e->getCode(), $e);
+      throw new MigrateException(sprintf('Format date plugin could not transform "%s" using the format "%s" for destination "%s". Error: %s', $value, $fromFormat, $destination_property, $e->getMessage()), $e->getCode(), $e);
     }
 
     return $transformed;

core/modules/migrate/tests/src/Unit/process/FormatDateTest.php

@@ -56,6 +56,20 @@ public function testMigrateExceptionBadFormat() {
     $this->plugin->transform('January 5, 1955', $this->migrateExecutable, $this->row, 'field_date');
   }
 
+  /**
+   * Tests that an unexpected date value will throw an exception.
+   */
+  public function testMigrateExceptionUnexpectedValue() {
+    $configuration = [
+      'from_format' => 'm/d/Y',
+      'to_format' => 'Y-m-d',
+    ];
+
+    $this->setExpectedException(MigrateException::class, 'Format date plugin could not transform "01/05/55" using the format "m/d/Y" for destination "field_date". Error: The created date does not match the input value.');
+    $this->plugin = new FormatDate($configuration, 'test_format_date', []);
+    $this->plugin->transform('01/05/55', $this->migrateExecutable, $this->row, 'field_date');
+  }
+
   /**
    * Tests that "timezone" configuration key triggers deprecation error.
    *