Function validate

test/unit/deferred.js:1127–1131

( label )

		resolved = jQuery.Deferred().resolve( true ),
		rejected = jQuery.Deferred().reject( false ),
		validate = function( label ) {
			return function() {
				assert.equal( when, "before", label );
			};
		},
		done = assert.async( 5 );

	jQuery.when().done( validate( "jQuery.when()" ) ).always( done );