[tag_categories] tests for category/tag splitting

ext/tag_categories/test.php

@@ -0,0 +1,22 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Shimmie2;
+
+use PHPUnit\Framework\Attributes\Depends;
+
+class TagCategoriesTest extends ShimmiePHPUnitTestCase
+{
+    public function testParsing(): void
+    {
+        $this->assertEquals("artist", TagCategories::get_tag_category("artist:bob"));
+        $this->assertEquals("bob", TagCategories::get_tag_body("artist:bob"));
+
+        $this->assertEquals(null, TagCategories::get_tag_category("bob"));
+        $this->assertEquals("bob", TagCategories::get_tag_body("bob"));
+
+        $this->assertEquals(null, TagCategories::get_tag_category("notacategory:bob"));
+        $this->assertEquals("notacategory:bob", TagCategories::get_tag_body("notacategory:bob"));
+    }
+}