From f58ebaca1650dfc6ac8e74eee946825ceff7402d Mon Sep 17 00:00:00 2001
From: Matthias Beyer <mail@beyermatthias.de>
Date: Fri, 28 Feb 2020 22:25:43 +0100
Subject: Add helper function to fill arena with testing data

Signed-off-by: Matthias Beyer <mail@beyermatthias.de>
---
 lib/domain/libimagmail/src/mailtree.rs | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/lib/domain/libimagmail/src/mailtree.rs b/lib/domain/libimagmail/src/mailtree.rs
index 3b7ca745..944a0c4b 100644
--- a/lib/domain/libimagmail/src/mailtree.rs
+++ b/lib/domain/libimagmail/src/mailtree.rs
@@ -52,6 +52,27 @@ impl Mailtree {
     pub fn traverse(&self) -> Traverse {
         Traverse::with(self)
     }
+
+    #[cfg(test)]
+    fn fill_from_iter<I>(mut it: I) -> Option<(NodeId, Mailtree)>
+        where I: Iterator<Item = String>
+    {
+        let mut arena = Arena::new();
+        if let Some(rootdata) = it.next() {
+            let root = arena.new_node(rootdata);
+            let mut old_id = root.clone();
+
+            while let Some(next_data) = it.next() {
+                let next_id = arena.new_node(next_data);
+                old_id.append(next_id.clone(), &mut arena);
+
+                old_id = next_id;
+            }
+            Some((root, Mailtree { arena, root: root }))
+        } else {
+            None
+        }
+    }
 }
 
 fn fill_arena_with<'a>(arena: &mut Arena<String>, store: &'a MailStoreWithConnection<'a>, root: LoadedMail) -> Result<NodeId> {
-- 
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