fix: FontInstaller prüft Divis Schriftenliste vor font_add; leere Installation ist ein sauberer Rollback

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

tests/Unit/Integrations/Divi/Design/DiviFontsUploadAbilityTest.php

@@ -464,6 +464,24 @@ final class DiviFontsUploadAbilityTest extends TestCase
         $this->assertTempFilesRemoved();
     }
 
+    public function testAnInstallThatStoredNothingIsACleanRollback(): void
+    {
+        $installer = self::installer();
+        $installer->allows('install')->andReturn([]);
+        $installer->expects('remove')->never();
+        $log = FakeChangeLog::partialsOnly();
+
+        try {
+            $this->ability($installer, $log)->execute(self::input(['confirm' => true]));
+            self::fail('WriteFailed expected');
+        } catch (WriteFailed $e) {
+            self::assertTrue($e->rolledBack);
+            $error = self::assertToolError($e->toError(), 'write_failed');
+            self::assertStringContainsString('nichts gespeichert', $error['message']);
+        }
+        self::assertSame([], $log->partials);
+    }
+
     public function testAPartialInstallThatCannotBeRemovedIsAPartialWrite(): void
     {
         $installer = self::installer();

tests/Unit/Integrations/Divi/Design/FontInstallerTest.php

@@ -37,6 +37,7 @@ final class FontInstallerTest extends TestCase
     protected function setUp(): void
     {
         parent::setUp();
+        Functions\when('get_option')->justReturn([]);
         Functions\when('sanitize_file_name')->alias(static fn (string $name): string => str_replace(' ', '-', $name));
     }
 
@@ -83,6 +84,7 @@ final class FontInstallerTest extends TestCase
         );
         self::assertSame('AiAgentImageUtility::install_to_custom_fonts()', $manifest->mirrors[0]->label());
         self::assertSame([DiviFeature::FontUpload], $manifest->features);
+        self::assertSame(['et_uploaded_fonts'], $manifest->keys);
     }
 
     public function testInstallNeedsAReleasedDivi(): void
@@ -204,6 +206,21 @@ final class FontInstallerTest extends TestCase
         );
     }
 
+    /** @runInSeparateProcess */
+    public function testACorruptFontListStopsTheInstallBeforeFontAdd(): void
+    {
+        $woff2 = $this->tempFile('wOF2DATA');
+        Functions\when('get_option')->justReturn('kaputt');
+        Mockery::mock('alias:' . self::HOOKS)->allows('check_filetype_and_ext_font')
+            ->andReturn(['ext' => 'woff2', 'type' => 'font/woff2', 'proper_filename' => 'Inter.woff2']);
+        Mockery::mock('alias:' . self::FONTS)->expects('font_add')->never();
+
+        $this->expectException(RuntimeException::class);
+        $this->expectExceptionMessage('et_uploaded_fonts');
+
+        (new FontInstaller())->install('Inter', ['woff2' => $woff2], 'all', 'sans-serif');
+    }
+
     /** @runInSeparateProcess */
     public function testAFileDivisTypeCheckRefusesStopsTheInstallBeforeFontAdd(): void
     {