Convert simple-icons manual backup from submodule to tracked files

logos/simple-icons.manual-backup-20251123-234134/tests/index.test.js

@@ -0,0 +1,21 @@
+// @ts-check
+/**
+ * @file Tests for the index file of npm package.
+ */
+
+// The index.mjs file is generated on build before running tests
+// @ts-ignore
+import * as rawSimpleIcons from '../index.mjs';
+import {getIconSlug, getIconsData, slugToVariableName} from '../sdk.mjs';
+import {testIcon} from './test-icon.js';
+
+/** @type {{ [key: string]: import('../types.d.ts').SimpleIcon }} */
+const simpleIcons = rawSimpleIcons;
+
+for (const iconData of await getIconsData()) {
+	const slug = getIconSlug(iconData);
+	const variableName = slugToVariableName(slug);
+	const subject = simpleIcons[variableName];
+
+	testIcon(iconData, subject, slug);
+}