diff --git a/core/modules/file/src/Plugin/migrate/source/d6/File.php b/core/modules/file/src/Plugin/migrate/source/d6/File.php
index 9ec4887671ee5cafdadeae4eeb03ec208647277d..14a0a6d4cb51e449abcd5d626abe76770804c53b 100644
--- a/core/modules/file/src/Plugin/migrate/source/d6/File.php
+++ b/core/modules/file/src/Plugin/migrate/source/d6/File.php
@@ -42,6 +42,7 @@ class File extends DrupalSqlBase {
   public function query() {
     return $this->select('files', 'f')
       ->fields('f')
+      ->condition('filepath', '/tmp%', 'NOT LIKE')
       ->orderBy('timestamp')
       // If two or more files have the same timestamp, they'll end up in a
       // non-deterministic order. Ordering by fid (or any other unique field)
diff --git a/core/modules/file/src/Plugin/migrate/source/d7/File.php b/core/modules/file/src/Plugin/migrate/source/d7/File.php
index 5e88151229ade20e0f5710a10bb80b61574bfec4..c0da770b70a769ed3ee85ed21418985e54bdc536 100644
--- a/core/modules/file/src/Plugin/migrate/source/d7/File.php
+++ b/core/modules/file/src/Plugin/migrate/source/d7/File.php
@@ -43,18 +43,21 @@ class File extends DrupalSqlBase {
   public function query() {
     $query = $this->select('file_managed', 'f')
       ->fields('f')
+      ->condition('uri', 'temporary://%', 'NOT LIKE')
       ->orderBy('f.timestamp');
 
     // Filter by scheme(s), if configured.
     if (isset($this->configuration['scheme'])) {
       $schemes = [];
+      // Remove 'temporary' scheme.
+      $valid_schemes = array_diff((array) $this->configuration['scheme'], ['temporary']);
       // Accept either a single scheme, or a list.
-      foreach ((array) $this->configuration['scheme'] as $scheme) {
+      foreach ((array) $valid_schemes as $scheme) {
         $schemes[] = rtrim($scheme) . '://';
       }
       $schemes = array_map([$this->getDatabase(), 'escapeLike'], $schemes);
 
-      // uri LIKE 'public://%' OR uri LIKE 'private://%'
+      // Add conditions, uri LIKE 'public://%' OR uri LIKE 'private://%'.
       $conditions = new Condition('OR');
       foreach ($schemes as $scheme) {
         $conditions->condition('uri', $scheme . '%', 'LIKE');
diff --git a/core/modules/file/tests/src/Kernel/Migrate/d6/MigrateFileTest.php b/core/modules/file/tests/src/Kernel/Migrate/d6/MigrateFileTest.php
index 989eb15900c1846cf95ba074ed080c798d3a3b78..a3d4ba5e7c2e48b277ecf98e56047aef8e275d4e 100644
--- a/core/modules/file/tests/src/Kernel/Migrate/d6/MigrateFileTest.php
+++ b/core/modules/file/tests/src/Kernel/Migrate/d6/MigrateFileTest.php
@@ -2,7 +2,6 @@
 
 namespace Drupal\Tests\file\Kernel\Migrate\d6;
 
-use Drupal\Component\Utility\Random;
 use Drupal\file\Entity\File;
 use Drupal\file\FileInterface;
 use Drupal\KernelTests\KernelTestBase;
@@ -11,7 +10,7 @@
 use Drupal\Tests\migrate_drupal\Kernel\d6\MigrateDrupal6TestBase;
 
 /**
- * file migration.
+ * Test file migration.
  *
  * @group migrate_drupal_6
  */
@@ -68,8 +67,10 @@ protected function assertEntity($fid, $name, $size, $uri, $type, $uid) {
   public function testFiles() {
     $this->assertEntity(1, 'Image1.png', '39325', 'public://image-1.png', 'image/png', '1');
     $this->assertEntity(2, 'Image2.jpg', '1831', 'public://image-2.jpg', 'image/jpeg', '1');
-    $this->assertEntity(3, 'Image-test.gif', '183', 'public://image-test.gif', 'image/jpeg', '1');
+    $this->assertEntity(3, 'image-3.jpg', '1831', 'public://image-3.jpg', 'image/jpeg', '1');
     $this->assertEntity(4, 'html-1.txt', '24', 'public://html-1.txt', 'text/plain', '1');
+    // Ensure temporary file was not migrated.
+    $this->assertNull(File::load(6));
 
     $map_table = $this->getMigration('d6_file')->getIdMap()->mapTableName();
     $map = \Drupal::database()
@@ -81,10 +82,9 @@ public function testFiles() {
       // The 4 files from the fixture.
       1 => '1',
       2 => '2',
+      // The file updated in migrateDumpAlter().
       3 => '3',
       5 => '4',
-      // The file updated in migrateDumpAlter().
-      6 => NULL,
       // The file created in migrateDumpAlter().
       7 => '4',
     ];
@@ -124,10 +124,9 @@ public function testFiles() {
       // The 4 files from the fixture.
       1 => '5',
       2 => '6',
+      // The file updated in migrateDumpAlter().
       3 => '7',
       5 => '8',
-      // The file updated in migrateDumpAlter().
-      6 => NULL,
       // The files created in migrateDumpAlter().
       7 => '8',
       8 => '8',
@@ -142,33 +141,17 @@ public function testFiles() {
     $this->assertEquals(8, count(File::loadMultiple()));
   }
 
-  /**
-   * @return string
-   *   A filename based upon the test.
-   */
-  public static function getUniqueFilename() {
-    return static::$tempFilename;
-  }
-
   /**
    * {@inheritdoc}
    */
   public static function migrateDumpAlter(KernelTestBase $test) {
-    // Creates a random filename and updates the source database.
-    $random = new Random();
-    $temp_directory = file_directory_temp();
-    file_prepare_directory($temp_directory, FILE_CREATE_DIRECTORY);
-    static::$tempFilename = $test->getDatabasePrefix() . $random->name() . '.jpg';
-    $file_path = $temp_directory . '/' . static::$tempFilename;
-    file_put_contents($file_path, '');
-
     $db = Database::getConnection('default', 'migrate');
 
     $db->update('files')
-      ->condition('fid', 6)
+      ->condition('fid', 3)
       ->fields([
-        'filename' => static::$tempFilename,
-        'filepath' => $file_path,
+        'filename' => 'image-3.jpg',
+        'filepath' => 'core/modules/simpletest/files/image-3.jpg',
       ])
       ->execute();
 
diff --git a/core/modules/file/tests/src/Kernel/Migrate/d7/MigrateFileTest.php b/core/modules/file/tests/src/Kernel/Migrate/d7/MigrateFileTest.php
index 38ef4ff32008c02fe5c4bed4fa43647deb17d251..ea32df5e3483eeeb1ad5e074be17252bc53cfc75 100644
--- a/core/modules/file/tests/src/Kernel/Migrate/d7/MigrateFileTest.php
+++ b/core/modules/file/tests/src/Kernel/Migrate/d7/MigrateFileTest.php
@@ -2,6 +2,7 @@
 
 namespace Drupal\Tests\file\Kernel\Migrate\d7;
 
+use Drupal\file\Entity\File;
 use Drupal\Tests\migrate_drupal\Kernel\d7\MigrateDrupal7TestBase;
 
 /**
@@ -43,6 +44,8 @@ protected function getFileMigrationInfo() {
    */
   public function testFileMigration() {
     $this->assertEntity(1, 'cube.jpeg', 'public://cube.jpeg', 'image/jpeg', '3620', '1421727515', '1421727515', '1');
+    // Ensure temporary file was not migrated.
+    $this->assertNull(File::load(4));
   }
 
 }
diff --git a/core/modules/file/tests/src/Kernel/Plugin/migrate/source/d6/FileTest.php b/core/modules/file/tests/src/Kernel/Plugin/migrate/source/d6/FileTest.php
index cc8c9b36faf048ea4fd0c64564a34236de915ea0..33c430e2fdf276d11a5fde7883030b53c5d77eee 100644
--- a/core/modules/file/tests/src/Kernel/Plugin/migrate/source/d6/FileTest.php
+++ b/core/modules/file/tests/src/Kernel/Plugin/migrate/source/d6/FileTest.php
@@ -46,11 +46,42 @@ public function providerSource() {
         'status' => 1,
         'timestamp' => 1382255662,
       ],
+      [
+        'fid' => 3,
+        'uid' => 1,
+        'filename' => 'migrate-test-file-3.pdf',
+        'filepath' => '/tmp/migrate-test-file-3.pdf',
+        'filemime' => 'application/pdf',
+        'filesize' => 304124,
+        'status' => 1,
+        'timestamp' => 1382277662,
+      ],
     ];
 
-    // The expected results are identical to the source data.
-    $tests[0]['expected_data'] = $tests[0]['source_data']['files'];
-
+    // The expected results are the same as the source data but excluding
+    // the temporary file.
+    $tests[0]['expected_data'] = [
+      [
+        'fid' => 1,
+        'uid' => 1,
+        'filename' => 'migrate-test-file-1.pdf',
+        'filepath' => 'sites/default/files/migrate-test-file-1.pdf',
+        'filemime' => 'application/pdf',
+        'filesize' => 890404,
+        'status' => 1,
+        'timestamp' => 1382255613,
+      ],
+      [
+        'fid' => 2,
+        'uid' => 1,
+        'filename' => 'migrate-test-file-2.pdf',
+        'filepath' => 'sites/default/files/migrate-test-file-2.pdf',
+        'filemime' => 'application/pdf',
+        'filesize' => 204124,
+        'status' => 1,
+        'timestamp' => 1382255662,
+      ],
+    ];
     return $tests;
   }
 
diff --git a/core/modules/file/tests/src/Kernel/Plugin/migrate/source/d7/FileTest.php b/core/modules/file/tests/src/Kernel/Plugin/migrate/source/d7/FileTest.php
index 8ae0ec41fa16257c0c684b4aa43f217199304309..b588ad789ce5ad19fc99c6be45f4b8dd7b8a57d1 100644
--- a/core/modules/file/tests/src/Kernel/Plugin/migrate/source/d7/FileTest.php
+++ b/core/modules/file/tests/src/Kernel/Plugin/migrate/source/d7/FileTest.php
@@ -84,15 +84,14 @@ public function providerSource() {
       ],
     ];
 
-    // The expected results will include only the first three files, since we
-    // are configuring the plugin to filter out the file with the null URI
-    // scheme.
-    $tests[0]['expected_data'] = array_slice($tests[0]['source_data']['file_managed'], 0, 3);
+    // The expected results will include only the first two files, since the
+    // plugin will filter out files with either the null URI scheme or the
+    // temporary scheme.
+    $tests[0]['expected_data'] = array_slice($tests[0]['source_data']['file_managed'], 0, 2);
 
     // The filepath property will vary by URI scheme.
     $tests[0]['expected_data'][0]['filepath'] = 'sites/default/files/cube.jpeg';
     $tests[0]['expected_data'][1]['filepath'] = '/path/to/private/files/cube.jpeg';
-    $tests[0]['expected_data'][2]['filepath'] = '/tmp/cube.jpeg';
 
     // Do an automatic count.
     $tests[0]['expected_count'] = NULL;
@@ -102,10 +101,61 @@ public function providerSource() {
       'constants' => [
         'source_base_path' => '/path/to/files',
       ],
-      // Only return files which use one of these URI schemes.
       'scheme' => ['public', 'private', 'temporary'],
     ];
 
+    // Test getting only public files.
+    $tests[1]['source_data'] = $tests[0]['source_data'];
+
+    $tests[1]['expected_data'] = [
+      [
+        'fid' => '1',
+        'uid' => '1',
+        'filename' => 'cube.jpeg',
+        'uri' => 'public://cube.jpeg',
+        'filemime' => 'image/jpeg',
+        'filesize' => '3620',
+        'status' => '1',
+        'timestamp' => '1421727515',
+      ],
+    ];
+    // Do an automatic count.
+    $tests[1]['expected_count'] = NULL;
+
+    // Set up plugin configuration.
+    $tests[1]['configuration'] = [
+      'constants' => [
+        'source_base_path' => '/path/to/files',
+      ],
+      'scheme' => ['public'],
+    ];
+
+    // Test getting only public files when configuration scheme is not an array.
+    $tests[2]['source_data'] = $tests[0]['source_data'];
+
+    $tests[2]['expected_data'] = [
+      [
+        'fid' => '1',
+        'uid' => '1',
+        'filename' => 'cube.jpeg',
+        'uri' => 'public://cube.jpeg',
+        'filemime' => 'image/jpeg',
+        'filesize' => '3620',
+        'status' => '1',
+        'timestamp' => '1421727515',
+      ],
+    ];
+    // Do an automatic count.
+    $tests[2]['expected_count'] = NULL;
+
+    // Set up plugin configuration.
+    $tests[2]['configuration'] = [
+      'constants' => [
+        'source_base_path' => '/path/to/files',
+      ],
+      'scheme' => 'public',
+    ];
+
     return $tests;
   }
 
diff --git a/core/modules/migrate_drupal/tests/fixtures/drupal7.php b/core/modules/migrate_drupal/tests/fixtures/drupal7.php
index e76ee20f236dafedd5d55ce68f3987f707e494c1..3624a4a92fba806a62e03a7c692558b7eeb757f3 100644
--- a/core/modules/migrate_drupal/tests/fixtures/drupal7.php
+++ b/core/modules/migrate_drupal/tests/fixtures/drupal7.php
@@ -13373,6 +13373,17 @@
   'status' => '1',
   'timestamp' => '1486104045',
 ))
+->values(array(
+  'fid' => '4',
+  'uid' => '1',
+  'filename' => 'TerokNor.txt',
+  'uri' => 'temporary://TerokNor.txt',
+  'filemime' => 'text/plain',
+  'filesize' => '2369',
+  'status' => '1',
+  'timestamp' => '1421747516',
+))
+
 ->execute();
 
 $connection->schema()->createTable('file_usage', array(
diff --git a/core/modules/migrate_drupal_ui/tests/src/Functional/d6/MigrateUpgrade6Test.php b/core/modules/migrate_drupal_ui/tests/src/Functional/d6/MigrateUpgrade6Test.php
index 96aa5579177540ef91e7989a413eb1b87daf35b4..d8ffd0296437255a4a8a806ee7fb09973e9c9fbe 100644
--- a/core/modules/migrate_drupal_ui/tests/src/Functional/d6/MigrateUpgrade6Test.php
+++ b/core/modules/migrate_drupal_ui/tests/src/Functional/d6/MigrateUpgrade6Test.php
@@ -69,7 +69,7 @@ protected function getEntityCounts() {
       'editor' => 2,
       'field_config' => 89,
       'field_storage_config' => 63,
-      'file' => 8,
+      'file' => 7,
       'filter_format' => 7,
       'image_style' => 5,
       'language_content_settings' => 3,
@@ -109,7 +109,7 @@ protected function getEntityCountsIncremental() {
     $counts['comment'] = 7;
     $counts['entity_view_display'] = 55;
     $counts['entity_view_mode'] = 14;
-    $counts['file'] = 9;
+    $counts['file'] = 8;
     $counts['menu_link_content'] = 11;
     $counts['node'] = 18;
     $counts['taxonomy_term'] = 9;
diff --git a/core/modules/simpletest/files/image-3.jpg b/core/modules/simpletest/files/image-3.jpg
new file mode 100644
index 0000000000000000000000000000000000000000..ace07d078a00bee3b0ab02f7f077e39c23f2aa03
--- /dev/null
+++ b/core/modules/simpletest/files/image-3.jpg
@@ -0,0 +1,19 @@
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+
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+(((((((((((((((((((((((((((((((((((((((((((((((((((��<P
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\ No newline at end of file