Issue #3092430 by quietone, shrutidkadam, RdeBoer, bgprior, danflanagan8: Ensure SearchPlugin has a configuration array

(cherry picked from commit 331e284ef0)

core/modules/search/migrations/d7_search_page.yml

@@ -41,6 +41,9 @@ process:
         - module
         - 'constants/suffix'
   path: module
+  configuration:
+    plugin: default_value
+    default_value: [ ]
   'configuration/rankings':
     plugin: search_configuration_rankings
 destination:

core/modules/search/migrations/search_page.yml

@@ -21,6 +21,9 @@ process:
   id: 'constants/id'
   path: 'constants/path'
   plugin: 'constants/plugin'
+  configuration:
+    plugin: default_value
+    default_value: [ ]
   'configuration/rankings':
     plugin: search_configuration_rankings
 destination:

core/modules/search/tests/src/Kernel/Migrate/d6/MigrateSearchPageTest.php

@@ -60,6 +60,20 @@ class MigrateSearchPageTest extends MigrateDrupal6TestBase {
 
     $configuration = SearchPage::load($id)->getPlugin()->getConfiguration();
     $this->assertSame(4, $configuration['rankings']['comments']);
+
+    // Test that a configurable search without a configuration imports. Do this
+    // by removing the node rankings from the source database.
+    Database::getConnection('default', 'migrate')
+      ->delete('variable')
+      ->condition('name', 'node_rank_%', 'LIKE')
+      ->execute();
+
+    $migration = $this->getMigration('search_page');
+    $migration->getIdMap()->prepareUpdate();
+    $this->executeMigration($migration);
+
+    $configuration = SearchPage::load($id)->getPlugin()->getConfiguration();
+    $this->assertSame([], $configuration['rankings']);
   }
 
 }

core/modules/search/tests/src/Kernel/Migrate/d7/MigrateSearchPageTest.php

@@ -79,6 +79,19 @@ class MigrateSearchPageTest extends MigrateDrupal7TestBase {
     $this->executeMigration($migration);
     $configuration['rankings']['comments'] = 4;
     $this->assertEntity('node_search', 'node', TRUE, $configuration);
+
+    // Test that a configurable search without a configuration imports. Do this
+    // by removing the node rankings from the source database.
+    Database::getConnection('default', 'migrate')
+      ->delete('variable')
+      ->condition('name', 'node_rank_%', 'LIKE')
+      ->execute();
+
+    $migration = $this->getMigration('d7_search_page');
+    $migration->getIdMap()->prepareUpdate();
+    $this->executeMigration($migration);
+    $configuration = ['rankings' => []];
+    $this->assertEntity('node_search', 'node', TRUE, $configuration);
   }
 
   /**