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diff --git a/web/modules/contrib/drupalmoduleupgrader/tests/src/Unit/Plugin/DMU/Fixer/ImplementTest.php b/web/modules/contrib/drupalmoduleupgrader/tests/src/Unit/Plugin/DMU/Fixer/ImplementTest.php
new file mode 100644
index 000000000..6e04517f1
--- /dev/null
+++ b/web/modules/contrib/drupalmoduleupgrader/tests/src/Unit/Plugin/DMU/Fixer/ImplementTest.php
@@ -0,0 +1,55 @@
+<?php
+
+namespace Drupal\Tests\drupalmoduleupgrader\Unit\Plugin\DMU\Fixer;
+
+use Drupal\drupalmoduleupgrader\IOException;
+use Drupal\drupalmoduleupgrader\Plugin\DMU\Fixer\Implement;
+use Drupal\Tests\drupalmoduleupgrader\Unit\TestBase;
+use Pharborist\NodeCollection;
+use Pharborist\Objects\ClassNode;
+
+/**
+ * @group DMU.Fixer
+ */
+class ImplementTest extends TestBase {
+
+  public function test() {
+    $class = ClassNode::create('Foobaz');
+    $indexer = $this->getMock('\Drupal\drupalmoduleupgrader\IndexerInterface');
+    $indexer->method('get')->with('Foobaz')->willReturn(new NodeCollection([$class]));
+
+    $this
+      ->container
+      ->get('plugin.manager.drupalmoduleupgrader.indexer')
+      ->method('createInstance')
+      ->with('class')
+      ->willReturn($indexer);
+
+    $config = [
+      'definition' => '\Drupal\Core\Block\BlockPluginInterface::blockForm',
+      'target' => 'Foobaz',
+    ];
+    $plugin = new Implement($config, uniqID(), []);
+    $plugin->setTarget($this->target);
+    try {
+      // We expect a CodeManagerIOException because we're implementing the
+      // method on a class that is not officially part of the target's code.
+      // That's OK, though.
+      $plugin->execute();
+    }
+    catch (IOException $e) {}
+
+    $this->assertTrue($class->hasMethod('blockForm'));
+    $method = $class->getMethod('blockForm');
+    $this->assertInstanceOf('\Pharborist\Objects\ClassMethodNode', $method);
+    $parameters = $method->getParameters();
+    $this->assertCount(2, $parameters);
+    $this->assertEquals($parameters[0]->getName(), 'form');
+    $this->assertNull($parameters[0]->getTypeHint());
+    $this->assertEquals($parameters[1]->getName(), 'form_state');
+    $type = $parameters[1]->getTypeHint();
+    $this->assertInstanceOf('\Pharborist\Namespaces\NameNode', $type);
+    $this->assertEquals('Drupal\Core\Form\FormStateInterface', $type->getText());
+  }
+
+}