diff --git a/tests/backend/Modules/Dictionary/Infrastructure/Import/ArchiveExtractorTest.php b/tests/backend/Modules/Dictionary/Infrastructure/Import/ArchiveExtractorTest.php
index 75c79c50d..92a6edaef 100644
--- a/tests/backend/Modules/Dictionary/Infrastructure/Import/ArchiveExtractorTest.php
+++ b/tests/backend/Modules/Dictionary/Infrastructure/Import/ArchiveExtractorTest.php
@@ -15,13 +15,16 @@
 namespace Lwt\Tests\Modules\Dictionary\Infrastructure\Import;
 
 use Lwt\Modules\Dictionary\Infrastructure\Import\ArchiveExtractor;
+use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\TestCase;
 use RuntimeException;
 use ZipArchive;
 
 /**
- * @covers \Lwt\Modules\Dictionary\Infrastructure\Import\ArchiveExtractor
+ * Archive detection, extraction and cleanup, including the path-traversal
+ * guard and the nested-file search extraction relies on.
  */
+#[CoversClass(ArchiveExtractor::class)]
 class ArchiveExtractorTest extends TestCase
 {
     private string $sandbox;
diff --git a/tests/backend/Modules/Dictionary/Infrastructure/Import/CsvImporterBomTest.php b/tests/backend/Modules/Dictionary/Infrastructure/Import/CsvImporterBomTest.php
index b0580a1c0..2b209ade9 100644
--- a/tests/backend/Modules/Dictionary/Infrastructure/Import/CsvImporterBomTest.php
+++ b/tests/backend/Modules/Dictionary/Infrastructure/Import/CsvImporterBomTest.php
@@ -15,12 +15,15 @@
 namespace Lwt\Tests\Modules\Dictionary\Infrastructure\Import;
 
 use Lwt\Modules\Dictionary\Infrastructure\Import\CsvImporter;
+use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\TestCase;
 use RuntimeException;
 
 /**
- * @covers \Lwt\Modules\Dictionary\Infrastructure\Import\CsvImporter
+ * What the importer does with a byte-order mark: UTF-8 is stripped from the
+ * first cell, UTF-16 and UTF-32 are refused with a message that says why.
  */
+#[CoversClass(CsvImporter::class)]
 class CsvImporterBomTest extends TestCase
 {
     private string $tmpDir;
diff --git a/tests/backend/Modules/Dictionary/Infrastructure/Import/CsvImporterCanImportTest.php b/tests/backend/Modules/Dictionary/Infrastructure/Import/CsvImporterCanImportTest.php
index 02599189f..29aaa48bd 100644
--- a/tests/backend/Modules/Dictionary/Infrastructure/Import/CsvImporterCanImportTest.php
+++ b/tests/backend/Modules/Dictionary/Infrastructure/Import/CsvImporterCanImportTest.php
@@ -16,11 +16,14 @@
 namespace Lwt\Tests\Modules\Dictionary\Infrastructure\Import;
 
 use Lwt\Modules\Dictionary\Infrastructure\Import\CsvImporter;
+use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\TestCase;
 
 /**
- * @covers \Lwt\Modules\Dictionary\Infrastructure\Import\CsvImporter
+ * Whether a file is a CSV when the upload path has no extension, which is
+ * how PHP hands over $_FILES['file']['tmp_name'].
  */
+#[CoversClass(CsvImporter::class)]
 class CsvImporterCanImportTest extends TestCase
 {
     private string $tmpDir;
diff --git a/tests/backend/Modules/Dictionary/Infrastructure/Import/JsonImporterCanImportTest.php b/tests/backend/Modules/Dictionary/Infrastructure/Import/JsonImporterCanImportTest.php
index a52031f31..8d6d5588e 100644
--- a/tests/backend/Modules/Dictionary/Infrastructure/Import/JsonImporterCanImportTest.php
+++ b/tests/backend/Modules/Dictionary/Infrastructure/Import/JsonImporterCanImportTest.php
@@ -16,11 +16,14 @@
 namespace Lwt\Tests\Modules\Dictionary\Infrastructure\Import;
 
 use Lwt\Modules\Dictionary\Infrastructure\Import\JsonImporter;
+use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\TestCase;
 
 /**
- * @covers \Lwt\Modules\Dictionary\Infrastructure\Import\JsonImporter
+ * Whether a file is JSON when the upload path has no extension, which is
+ * how PHP hands over $_FILES['file']['tmp_name'].
  */
+#[CoversClass(JsonImporter::class)]
 class JsonImporterCanImportTest extends TestCase
 {
     private string $tmpDir;