diff --git a/core/modules/migrate_drupal/src/Plugin/migrate/source/DrupalSqlBase.php b/core/modules/migrate_drupal/src/Plugin/migrate/source/DrupalSqlBase.php
index 8c705517cbb6d732afeb2fd041030b64fc9a05ef..87bd66d3770ae597a63b93b6498e3111d0ea4490 100644
--- a/core/modules/migrate_drupal/src/Plugin/migrate/source/DrupalSqlBase.php
+++ b/core/modules/migrate_drupal/src/Plugin/migrate/source/DrupalSqlBase.php
@@ -102,7 +102,7 @@ public function checkRequirements() {
           }
         }
         else {
-          throw new RequirementsException('Missing source provider ' . $this->pluginDefinition['source_provider'], ['source_provider' => $this->pluginDefinition['source_provider']]);
+          throw new RequirementsException('The module ' . $this->pluginDefinition['source_provider'] . ' is not enabled in the source site.');
         }
       }
     }
diff --git a/core/modules/migrate_drupal/tests/src/Unit/source/DrupalSqlBaseTest.php b/core/modules/migrate_drupal/tests/src/Unit/source/DrupalSqlBaseTest.php
new file mode 100644
index 0000000000000000000000000000000000000000..f603afa5397c2b04fc3e016401d42544cc946288
--- /dev/null
+++ b/core/modules/migrate_drupal/tests/src/Unit/source/DrupalSqlBaseTest.php
@@ -0,0 +1,102 @@
+<?php
+
+namespace Drupal\Tests\migrate_drupal\Unit\source;
+
+use Drupal\Tests\migrate\Unit\MigrateTestCase;
+use Drupal\migrate\Exception\RequirementsException;
+
+/**
+ * @coversDefaultClass Drupal\migrate_drupal\Plugin\migrate\source\DrupalSqlBase
+ * @group migrate_drupal
+ */
+class DrupalSqlBaseTest extends MigrateTestCase {
+
+  /**
+   * Define bare minimum migration configuration.
+   */
+  protected $migrationConfiguration = array(
+    'id' => 'DrupalSqlBase',
+  );
+
+  /**
+   * @var \Drupal\migrate_drupal\Plugin\migrate\source\DrupalSqlBase
+  */
+  protected $base;
+
+  /**
+   * Minimum database contents needed to test DrupalSqlBase.
+   */
+  protected $databaseContents = array(
+    'system' => array(
+      array(
+        'filename' => 'sites/all/modules/module1',
+        'name' => 'module1',
+        'type' => 'module',
+        'status' => 0,
+        'schema_version' => -1,
+      ),
+    ),
+  );
+
+  /**
+   * @covers ::checkRequirements
+   */
+  public function testSourceProviderNotActive() {
+    $this->setExpectedException(RequirementsException::class, 'The module module1 is not enabled in the source site.');
+    $plugin_definition['requirements_met'] = TRUE;
+    $plugin_definition['source_provider'] = 'module1';
+    /** @var \Drupal\Core\State\StateInterface $state */
+    $state = $this->getMock('Drupal\Core\State\StateInterface');
+    /** @var \Drupal\Core\Entity\EntityManagerInterface $entity_manager */
+    $entity_manager = $this->getMock('Drupal\Core\Entity\EntityManagerInterface');
+    $plugin = new TestDrupalSqlBase([], 'placeholder_id', $plugin_definition, $this->getMigration(), $state, $entity_manager);
+    $plugin->setDatabase($this->getDatabase($this->databaseContents));
+    $system_data = $plugin->getSystemData();
+    $plugin->checkRequirements();
+  }
+
+}
+
+namespace Drupal\Tests\migrate_drupal\Unit\source;
+
+use Drupal\Core\Database\Connection;
+use Drupal\migrate_drupal\Plugin\migrate\source\DrupalSqlBase;
+
+/**
+ * Extends the DrupalSqlBase abstract class.
+ */
+class TestDrupalSqlBase extends DrupalSqlBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function fields() {
+    return [];
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function query() {
+  }
+
+  /**
+   * Tweaks DrupalSqlBase to set a new database connection for tests.
+   *
+   * @param \Drupal\Core\Database\Connection
+   *   The new connection to use.
+   *
+   * @see \Drupal\Tests\migrate\Unit\MigrateSourceSqlTestCase
+   */
+  public function setDatabase(Connection $database) {
+    $this->database = $database;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getIds() {
+    return [];
+  }
+
+}