Issue #3395395 by jhedstrom: Tests are failing on 10.1

src/Encoder/Xls.php

@@ -176,7 +176,7 @@ class Xls implements EncoderInterface {
     // Extract headers from the data.
     $headers = $this->extractHeaders($data, $context);
     foreach ($headers as $column => $header) {
-      $sheet->setCellValue(++$column, 1, $this->formatValue($header));
+      $sheet->setCellValue([++$column, 1], $this->formatValue($header));
     }
   }
 
@@ -268,7 +268,7 @@ class Xls implements EncoderInterface {
       $column = 1;
       foreach ($row as $value) {
         // Since headers have been added, rows are offset here by 2.
-        $sheet->setCellValue($column, $i + 2, $this->formatValue($value));
+        $sheet->setCellValue([$column, $i + 2], $this->formatValue($value));
         $column++;
       }
     }

tests/src/Unit/Encoder/XlsTest.php

@@ -2,10 +2,13 @@
 
 namespace Drupal\Tests\xls_serialization\Unit\Encoder;
 
+use Drupal\Core\Config\ConfigFactoryInterface;
+use Drupal\Core\Config\ImmutableConfig;
 use Drupal\Tests\UnitTestCase;
 use Drupal\xls_serialization\Encoder\Xls;
 use PhpOffice\PhpSpreadsheet\IOFactory;
 use PhpOffice\PhpSpreadsheet\Shared\File;
+use Symfony\Component\DependencyInjection\ContainerInterface;
 
 /**
  * Tests the XLS encoder.
@@ -16,6 +19,22 @@ use PhpOffice\PhpSpreadsheet\Shared\File;
  */
 class XlsTest extends UnitTestCase {
 
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp(): void {
+    parent::setUp();
+
+    // The global \Drupal::config method is used within the encoder.
+    // @todo The config service should be injected instead.
+    $config = $this->prophesize(ImmutableConfig::class);
+    $config_factory = $this->prophesize(ConfigFactoryInterface::class);
+    $config_factory->get('xls_serialization.configuration')->willReturn($config->reveal());
+    $container = $this->prophesize(ContainerInterface::class);
+    $container->get('config.factory')->willReturn($config_factory->reveal());
+    \Drupal::setContainer($container->reveal());
+  }
+
   /**
    * @covers ::supportsEncoding
    */