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diff --git a/web/core/modules/views/tests/src/Kernel/Plugin/StyleGridTest.php b/web/core/modules/views/tests/src/Kernel/Plugin/StyleGridTest.php
new file mode 100644
index 000000000..d4381a632
--- /dev/null
+++ b/web/core/modules/views/tests/src/Kernel/Plugin/StyleGridTest.php
@@ -0,0 +1,100 @@
+<?php
+
+namespace Drupal\Tests\views\Kernel\Plugin;
+
+use Drupal\views\Views;
+use Drupal\views\ViewExecutable;
+
+/**
+ * Tests the grid style plugin.
+ *
+ * @group views
+ * @see \Drupal\views\Plugin\views\style\Grid
+ */
+class StyleGridTest extends PluginKernelTestBase {
+
+  /**
+   * Views used by this test.
+   *
+   * @var array
+   */
+  public static $testViews = ['test_grid'];
+
+  /**
+   * Keeps track of which alignments have been tested.
+   *
+   * @var array
+   */
+  protected $alignmentsTested = [];
+
+  /**
+   * Tests the grid style.
+   */
+  public function testGrid() {
+    $view = Views::getView('test_grid');
+    foreach (['horizontal', 'vertical'] as $alignment) {
+      $this->assertGrid($view, $alignment, 5);
+      $this->assertGrid($view, $alignment, 4);
+      $this->assertGrid($view, $alignment, 3);
+      $this->assertGrid($view, $alignment, 2);
+      $this->assertGrid($view, $alignment, 1);
+    }
+  }
+
+  /**
+   * Generates a grid and asserts that it is displaying correctly.
+   *
+   * @param \Drupal\views\ViewExecutable $view
+   *   The executable to prepare.
+   * @param string $alignment
+   *   The alignment of the grid to test.
+   * @param int $columns
+   *   The number of columns in the grid to test.
+   */
+  protected function assertGrid(ViewExecutable $view, $alignment, $columns) {
+    $view->setDisplay('default');
+    $view->initStyle();
+    $view->initHandlers();
+    $view->initQuery();
+    $view->style_plugin->options['alignment'] = $alignment;
+    $view->style_plugin->options['columns'] = $columns;
+    $this->executeView($view);
+    $output = $view->preview();
+    $output = \Drupal::service('renderer')->renderRoot($output);
+    $this->setRawContent($output);
+    if (!in_array($alignment, $this->alignmentsTested)) {
+      $result = $this->xpath('//div[contains(@class, "views-view-grid") and contains(@class, :alignment) and contains(@class, :columns)]', [':alignment' => $alignment, ':columns' => 'cols-' . $columns]);
+      $this->assertTrue(count($result), ucfirst($alignment) . " grid markup detected.");
+      $this->alignmentsTested[] = $alignment;
+    }
+    $width = '0';
+    switch ($columns) {
+      case 5: $width = '20';
+        break;
+
+      case 4: $width = '25';
+        break;
+
+      case 3: $width = '33.3333';
+        break;
+
+      case 2: $width = '50';
+        break;
+
+      case 1: $width = '100';
+        break;
+    }
+    // Ensure last column exists.
+    $result = $this->xpath('//div[contains(@class, "views-col") and contains(@class, :columns) and starts-with(@style, :width)]', [':columns' => 'col-' . $columns, ':width' => 'width: ' . $width]);
+    $this->assertTrue(count($result), ucfirst($alignment) . " $columns column grid: last column exists and automatic width calculated correctly.");
+    // Ensure no extra columns were generated.
+    $result = $this->xpath('//div[contains(@class, "views-col") and contains(@class, :columns)]', [':columns' => 'col-' . ($columns + 1)]);
+    $this->assertFalse(count($result), ucfirst($alignment) . " $columns column grid: no extraneous columns exist.");
+    // Ensure tokens are being replaced in custom row/column classes.
+    $result = $this->xpath('//div[contains(@class, "views-col") and contains(@class, "name-John")]');
+    $this->assertTrue(count($result), ucfirst($alignment) . " $columns column grid: Token replacement verified in custom column classes.");
+    $result = $this->xpath('//div[contains(@class, "views-row") and contains(@class, "age-25")]');
+    $this->assertTrue(count($result), ucfirst($alignment) . " $columns column grid: Token replacement verified in custom row classes.");
+  }
+
+}