Add new PHPUnit test for iis7SupportsPermalinks function

The newly created PHPUnit test verifies the behavior of the iis7SupportsPermalinks function. Specifically, it checks that the function returns false if the server is not IIS 7 and confirms that the appropriate filter is called correctly.

tests/phpunit/tests/functions/iis7SupportsPermalinks.php

@@ -0,0 +1,29 @@
+<?php
+global $is_iis7;
+if ( ! $is_iis7 ) {
+	/**
+	 * Tests for the iis7_supports_permalinks function.
+	 *
+	 * @group Functions
+	 *
+	 * @covers ::iis7_supports_permalinks
+	 */
+	class Tests_Functions_iis7SupportsPermalinks extends WP_UnitTestCase {
+
+		/**
+		 * check it returns false if the server is not IIS 7.
+		 * check the filter is called
+		 *
+		 * @ticket 60024
+		 */
+		public function test_iis7_supports_permalinks() {
+			$filter = new MockAction();
+
+			add_filter( 'iis7_supports_permalinks', array( $filter, 'filter' ) );
+
+			$this->assertFalse( iis7_supports_permalinks() );
+
+			$this->assertSame( 1, $filter->get_call_count() );
+		}
+	}
+}