it: test natural scrolling

src/it/test_utils/test_workspace_node_ext.rs

@@ -0,0 +1,20 @@
+use {
+    crate::{
+        it::test_error::TestResult,
+        tree::{ContainerNode, WorkspaceNode},
+    },
+    std::rc::Rc,
+};
+
+pub trait TestWorkspaceNodeExt {
+    fn container(&self) -> TestResult<Rc<ContainerNode>>;
+}
+
+impl TestWorkspaceNodeExt for WorkspaceNode {
+    fn container(&self) -> TestResult<Rc<ContainerNode>> {
+        match self.container.get() {
+            None => bail!("workspace does not have a container"),
+            Some(c) => Ok(c),
+        }
+    }
+}