diff --git a/core/tests/Drupal/Tests/Core/Plugin/PluginDependencyTraitTest.php b/core/tests/Drupal/Tests/Core/Plugin/PluginDependencyTraitTest.php
index 844c8152d3..f76fc672fe 100644
--- a/core/tests/Drupal/Tests/Core/Plugin/PluginDependencyTraitTest.php
+++ b/core/tests/Drupal/Tests/Core/Plugin/PluginDependencyTraitTest.php
@@ -16,10 +16,25 @@
  */
 class PluginDependencyTraitTest extends UnitTestCase {
 
+  /**
+   * @covers ::getPluginDependencies
+   *
+   * @dataProvider providerTestPluginDependencies
+   */
+  public function testGetPluginDependencies(ProphecyInterface $plugin, $definition, array $expected) {
+    $test_class = new TestPluginDependency();
+
+    $plugin->getPluginDefinition()->willReturn($definition);
+
+    $actual = $test_class->getPluginDependencies($plugin->reveal());
+    $this->assertEquals($expected, $actual);
+    $this->assertEmpty($test_class->getDependencies());
+  }
+
   /**
    * @covers ::calculatePluginDependencies
    *
-   * @dataProvider providerTestCalculatePluginDependencies
+   * @dataProvider providerTestPluginDependencies
    *
    * @param \Prophecy\Prophecy\ProphecyInterface $plugin
    *   A prophecy of a plugin instance.
@@ -38,9 +53,9 @@ public function testCalculatePluginDependencies(ProphecyInterface $plugin, $defi
   }
 
   /**
-   * Provides test data for ::testCalculatePluginDependencies().
+   * Provides test data for plugin dependencies.
    */
-  public function providerTestCalculatePluginDependencies() {
+  public function providerTestPluginDependencies() {
     $data = [];
 
     $plugin = $this->prophesize(PluginInspectionInterface::class);
@@ -111,6 +126,7 @@ class TestPluginDependency {
 
   use PluginDependencyTrait {
     calculatePluginDependencies as public;
+    getPluginDependencies as public;
   }
 
   /**