Add isExpanded() method to Tree and TreeGrid

Fixes #9595

2 files changed, 5 insertions, 2 deletions

diff --git a/server/src/test/java/com/vaadin/tests/components/TreeTest.java b/server/src/test/java/com/vaadin/tests/components/TreeTest.java
index 9224934a4c..c4ee9ae3d5 100644
--- a/server/src/test/java/com/vaadin/tests/components/TreeTest.java
+++ b/server/src/test/java/com/vaadin/tests/components/TreeTest.java
@@ -56,8 +56,7 @@ public class TreeTest {
         treeData.addItem(null, "Foo");
         treeData.addItem("Foo", "Bar");
         treeData.addItem("Foo", "Baz");
-        tree.setDataProvider(
-                new TreeDataProvider<>(treeData));
+        tree.setDataProvider(new TreeDataProvider<>(treeData));
 
         TreeCollapseExpandListener listener = new TreeCollapseExpandListener(
                 tree);
@@ -66,9 +65,11 @@ public class TreeTest {
 
         Assert.assertFalse(listener.isExpanded());
         tree.expand("Foo");
+        Assert.assertTrue("Item not expanded", tree.isExpanded("Foo"));
         Assert.assertTrue("Expand event not fired", listener.isExpanded());
         Assert.assertFalse(listener.isCollapsed());
         tree.collapse("Foo");
+        Assert.assertFalse("Item not collapsed", tree.isExpanded("Foo"));
         Assert.assertTrue("Collapse event not fired", listener.isCollapsed());
     }
 
diff --git a/server/src/test/java/com/vaadin/tests/components/treegrid/TreeGridTest.java b/server/src/test/java/com/vaadin/tests/components/treegrid/TreeGridTest.java
index 1f900688c4..fdaacae48b 100644
--- a/server/src/test/java/com/vaadin/tests/components/treegrid/TreeGridTest.java
+++ b/server/src/test/java/com/vaadin/tests/components/treegrid/TreeGridTest.java
@@ -35,11 +35,13 @@ public class TreeGridTest {
         // Test expand event
         Assert.assertFalse(expandEventFired);
         treeGrid.expand("Foo");
+        Assert.assertTrue("Item not expanded", treeGrid.isExpanded("Foo"));
         Assert.assertTrue("Expand event not fired", expandEventFired);
 
         // Test collapse event
         Assert.assertFalse(collapseEventFired);
         treeGrid.collapse("Foo");
+        Assert.assertFalse("Item not collapsed", treeGrid.isExpanded("Foo"));
         Assert.assertTrue("Collapse event not fired", collapseEventFired);
     }
 }