diff -u b/core/modules/file/tests/src/Unit/Plugin/migrate/cckfield/d6/FileCckTest.php b/core/modules/file/tests/src/Unit/Plugin/migrate/cckfield/d6/FileCckTest.php
--- b/core/modules/file/tests/src/Unit/Plugin/migrate/cckfield/d6/FileCckTest.php
+++ b/core/modules/file/tests/src/Unit/Plugin/migrate/cckfield/d6/FileCckTest.php
@@ -56,7 +56,7 @@
     $this->assertSame($expected, $this->migration->getProcess());
   }
 
-  /*
+  /**
    * Data provider for testGetFieldType().
    */
   public function getFieldTypeProvider() {
diff -u b/core/modules/file/tests/src/Unit/Plugin/migrate/cckfield/d7/FileCckTest.php b/core/modules/file/tests/src/Unit/Plugin/migrate/cckfield/d7/FileCckTest.php
--- b/core/modules/file/tests/src/Unit/Plugin/migrate/cckfield/d7/FileCckTest.php
+++ b/core/modules/file/tests/src/Unit/Plugin/migrate/cckfield/d7/FileCckTest.php
@@ -61,7 +61,7 @@
     $this->assertSame($expected, $this->migration->getProcess());
   }
 
-  /*
+  /**
    * Data provider for testGetFieldType().
    */
   public function getFieldTypeProvider() {
diff -u b/core/modules/file/tests/src/Unit/Plugin/migrate/field/d6/FileFieldTest.php b/core/modules/file/tests/src/Unit/Plugin/migrate/field/d6/FileFieldTest.php
--- b/core/modules/file/tests/src/Unit/Plugin/migrate/field/d6/FileFieldTest.php
+++ b/core/modules/file/tests/src/Unit/Plugin/migrate/field/d6/FileFieldTest.php
@@ -56,7 +56,7 @@
     $this->assertSame($expected, $this->migration->getProcess());
   }
 
-  /*
+  /**
    * Data provider for testGetFieldType().
    */
   public function getFieldTypeProvider() {
diff -u b/core/modules/file/tests/src/Unit/Plugin/migrate/field/d7/FileFieldTest.php b/core/modules/file/tests/src/Unit/Plugin/migrate/field/d7/FileFieldTest.php
--- b/core/modules/file/tests/src/Unit/Plugin/migrate/field/d7/FileFieldTest.php
+++ b/core/modules/file/tests/src/Unit/Plugin/migrate/field/d7/FileFieldTest.php
@@ -61,7 +61,7 @@
     $this->assertSame($expected, $this->migration->getProcess());
   }
 
-  /*
+  /**
    * Data provider for testGetFieldType().
    */
   public function getFieldTypeProvider() {
only in patch2:
unchanged:
--- /dev/null
+++ b/core/modules/taxonomy/tests/src/Unit/Plugin/migrate/cckfield/TaxonomyTermReferenceCckTest.php
@@ -0,0 +1,62 @@
+<?php
+
+namespace Drupal\Tests\taxonomy\Unit\Migrate\cckfield;
+
+use Drupal\migrate\Plugin\MigrationInterface;
+use Drupal\Tests\UnitTestCase;
+use Drupal\taxonomy\Plugin\migrate\cckfield\TaxonomyTermReference;
+use Prophecy\Argument;
+
+/**
+ * @coversDefaultClass \Drupal\taxonomy\Plugin\migrate\cckfield\TaxonomyTermReference
+ * @group taxonomy
+ */
+class TextFieldTest extends UnitTestCase {
+
+  /**
+   * @var \Drupal\migrate_drupal\Plugin\MigrateFieldInterface
+   */
+  protected $plugin;
+
+  /**
+   * @var \Drupal\migrate\Plugin\MigrationInterface
+   */
+  protected $migration;
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    $this->plugin = new TaxonomyTermReference([], 'text', []);
+
+    $migration = $this->prophesize(MigrationInterface::class);
+
+    // The plugin's processFieldValues() method will call
+    // setProcessOfProperty() and return nothing. So, in order to examine the
+    // process pipeline created by the plugin, we need to ensure that
+    // getProcess() always returns the last input to setProcessOfProperty().
+    $migration->setProcessOfProperty(Argument::type('string'), Argument::type('array'))
+      ->will(function($arguments) use ($migration) {
+        $migration->getProcess()->willReturn($arguments[1]);
+      });
+
+    $this->migration = $migration->reveal();
+  }
+
+  /**
+   * @covers ::processFieldValues
+   */
+  public function testProcessCckFieldValues() {
+    $this->plugin->processFieldValues($this->migration, 'somefieldname', []);
+
+    $expected = [
+      'plugin' => 'iterator',
+      'source' => 'somefieldname',
+      'process' => [
+        'target_id' => 'tid',
+      ],
+    ];
+    $this->assertSame($expected, $this->migration->getProcess());
+  }
+
+}
only in patch2:
unchanged:
--- /dev/null
+++ b/core/modules/taxonomy/tests/src/Unit/Plugin/migrate/field/TaxonomyTermReferenceFieldTest.php
@@ -0,0 +1,62 @@
+<?php
+
+namespace Drupal\Tests\taxonomy\Unit\Migrate\field;
+
+use Drupal\migrate\Plugin\MigrationInterface;
+use Drupal\Tests\UnitTestCase;
+use Drupal\taxonomy\Plugin\migrate\field\TaxonomyTermReference;
+use Prophecy\Argument;
+
+/**
+ * @coversDefaultClass \Drupal\taxonomy\Plugin\migrate\field\TaxonomyTermReference
+ * @group taxonomy
+ */
+class TextFieldTest extends UnitTestCase {
+
+  /**
+   * @var \Drupal\migrate_drupal\Plugin\MigrateFieldInterface
+   */
+  protected $plugin;
+
+  /**
+   * @var \Drupal\migrate\Plugin\MigrationInterface
+   */
+  protected $migration;
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    $this->plugin = new TaxonomyTermReference([], 'text', []);
+
+    $migration = $this->prophesize(MigrationInterface::class);
+
+    // The plugin's processFieldValues() method will call
+    // setProcessOfProperty() and return nothing. So, in order to examine the
+    // process pipeline created by the plugin, we need to ensure that
+    // getProcess() always returns the last input to setProcessOfProperty().
+    $migration->setProcessOfProperty(Argument::type('string'), Argument::type('array'))
+      ->will(function($arguments) use ($migration) {
+        $migration->getProcess()->willReturn($arguments[1]);
+      });
+
+    $this->migration = $migration->reveal();
+  }
+
+  /**
+   * @covers ::processFieldValues
+   */
+  public function testProcessCckFieldValues() {
+    $this->plugin->processFieldValues($this->migration, 'somefieldname', []);
+
+    $expected = [
+      'plugin' => 'iterator',
+      'source' => 'somefieldname',
+      'process' => [
+        'target_id' => 'tid',
+      ],
+    ];
+    $this->assertSame($expected, $this->migration->getProcess());
+  }
+
+}