remove unneccessary dependencies

tests/WP_Ultimo/Date_Functions_Test.php

@@ -0,0 +1,11 @@
+<?php
+
+namespace WP_Ultimo;
+
+class Date_Functions_Test extends \WP_UnitTestCase {
+	public function test_wu_get_days_ago() {
+		$days = wu_get_days_ago( '2024-01-01 00:00:00', '2024-01-31 00:00:00' );
+
+		$this->assertEquals( -30, $days );
+	}
+}