actually support synchronization

tests/sync.rs

@@ -0,0 +1,59 @@
+use chrono::Utc;
+use ot::{Operation, Server, DB};
+use uuid::Uuid;
+
+#[test]
+fn test_sync() {
+    let mut server = Server::new();
+
+    let mut db1 = DB::new();
+    db1.sync("me", &mut server);
+
+    let mut db2 = DB::new();
+    db2.sync("me", &mut server);
+
+    // make some changes in parallel to db1 and db2..
+    let uuid1 = Uuid::new_v4();
+    db1.apply(Operation::Create { uuid: uuid1 });
+    db1.apply(Operation::Update {
+        uuid: uuid1,
+        property: "title".into(),
+        value: "my first task".into(),
+        timestamp: Utc::now(),
+    });
+
+    let uuid2 = Uuid::new_v4();
+    db2.apply(Operation::Create { uuid: uuid2 });
+    db2.apply(Operation::Update {
+        uuid: uuid2,
+        property: "title".into(),
+        value: "my second task".into(),
+        timestamp: Utc::now(),
+    });
+
+    // and synchronize those around
+    db1.sync("me", &mut server);
+    db2.sync("me", &mut server);
+    db1.sync("me", &mut server);
+    assert_eq!(db1.tasks(), db2.tasks());
+
+    // now make updates to the same task on both sides
+    db1.apply(Operation::Update {
+        uuid: uuid2,
+        property: "priority".into(),
+        value: "H".into(),
+        timestamp: Utc::now(),
+    });
+    db2.apply(Operation::Update {
+        uuid: uuid2,
+        property: "project".into(),
+        value: "personal".into(),
+        timestamp: Utc::now(),
+    });
+
+    // and synchronize those around
+    db1.sync("me", &mut server);
+    db2.sync("me", &mut server);
+    db1.sync("me", &mut server);
+    assert_eq!(db1.tasks(), db2.tasks());
+}