diff --git a/tests/unit/collapsible/collapsible_core.js b/tests/unit/collapsible/collapsible_core.js
index 6be405f3..48907752 100644
--- a/tests/unit/collapsible/collapsible_core.js
+++ b/tests/unit/collapsible/collapsible_core.js
@@ -129,7 +129,7 @@
 				ok( collapsibles.eq(0).find( ".ui-collapsible-heading-toggle" ).hasClass( "ui-btn-up-a" ), "Heading of first collapsible should have class ui-btn-up-a");
 				ok( !collapsibles.eq(0).find( ".ui-collapsible-content" ).hasClass( "ui-btn-up-a" ), "Content of first collapsible should NOT have class ui-btn-up-a");
 				ok( collapsibles.eq(1).find( ".ui-collapsible-heading-toggle" ).hasClass( "ui-btn-up-b" ), "Heading of second collapsible should have class ui-btn-up-b");
-				ok( !collapsibles.eq(1).find( ".ui-collapsible-content" ).hasClass( "ui-btn-up-b" ), "Content of second collapsible should NOT have class ui-btn-up-b");
+				ok( collapsibles.eq(1).find( ".ui-collapsible-content" ).hasClass( "ui-btn-up-b" ), "Content of second collapsible should have class ui-btn-up-b");
 				ok( collapsibles.eq(2).find( ".ui-collapsible-heading-toggle" ).hasClass( "ui-btn-up-c" ), "Heading of third collapsible should have class ui-btn-up-c");
 				ok( collapsibles.eq(2).find( ".ui-collapsible-content" ).hasClass( "ui-btn-up-c" ), "Content of third collapsible should have class ui-btn-up-c");
 				start();