getThemeMediaDefaultFolderId example

        $bundle = $this->getThemeConfig();

        $this->themeLifecycleService->refreshTheme($bundle, $this->context);

        $themeEntity = $this->getTheme($bundle);

        static::assertTrue($themeEntity->isActive());
        static::assertInstanceOf(MediaCollection::class, $themeEntity->getMedia());
        static::assertEquals(2, $themeEntity->getMedia()->count());

        $themeDefaultFolderId = $this->getThemeMediaDefaultFolderId();
        foreach ($themeEntity->getMedia() as $media) {
            static::assertEquals($themeDefaultFolderId, $media->getMediaFolderId());
        }
    }

    public function testThemeConfigInheritanceAddsParentTheme(): void
    {
        $parentBundle = $this->getThemeConfigWithLabels();
        $this->themeLifecycleService->refreshTheme($parentBundle, $this->context);
        $bundle = $this->getThemeConfig();
        $bundle->setConfigInheritance(['@' . $parentBundle->getTechnicalName()]);