Themes: Add a unit test for get_theme_feature_list() to make sure that the list of theme features pulled from the WordPress.org API returns the expected data structure.

Props iandunn.
Fixes #28121.

git-svn-id: https://develop.svn.wordpress.org/trunk@39906 602fd350-edb4-49c9-b593-d223f7449a82

tests/phpunit/includes/testcase.php

@@ -439,6 +439,21 @@ class WP_UnitTestCase extends PHPUnit_Framework_TestCase {
 		$this->assertEquals( $expected, $actual );
 	}
 
+	/**
+	 * Asserts that the given variable is a multidimensional array, and that all arrays are non-empty.
+	 *
+	 * @param array $array
+	 */
+	function assertNonEmptyMultidimensionalArray( $array ) {
+		$this->assertTrue( is_array( $array ) );
+		$this->assertNotEmpty( $array );
+
+		foreach( $array as $sub_array ) {
+			$this->assertTrue( is_array( $sub_array ) );
+			$this->assertNotEmpty( $sub_array );
+		}
+	}
+
 	/**
 	 * Modify WordPress's query internals as if a given URL has been requested.
 	 *