Commit adds db from each session.

src/morethantext/cache.rs

@@ -41,7 +41,10 @@ impl Cache {
     }
 
     pub fn commit(&mut self, data: Store) -> FromCache {
-        self.data.insert(ENTRY.to_string(), data).unwrap();
+        let store = self.data.get_mut(ENTRY).unwrap();
+        for name in data.list() {
+            store.add(name).unwrap();
+        }
         FromCache::Ok
     }
 }

src/morethantext/mod.rs

@@ -129,6 +129,23 @@ mod mtt {
         let store2 = mtt.session().await.unwrap();
         assert_eq!(store2.list(), [db]);
     }
+
+    #[async_std::test]
+    async fn commit_from_multiple_sources() {
+        let dir = tempdir().unwrap();
+        let mtt1 = start_db(dir.path()).await.unwrap();
+        let mtt2 = mtt1.clone();
+        let db1 = "first";
+        let db2 = "second";
+        let mut store1 = mtt1.session().await.unwrap();
+        let mut store2 = mtt2.session().await.unwrap();
+        store1.add(db1).unwrap();
+        store2.add(db2).unwrap();
+        mtt1.commit(store1).await.unwrap();
+        mtt2.commit(store2).await.unwrap();
+        let output = mtt1.session().await.unwrap();
+        assert_eq!(output.list(), [db1, db2]);
+    }
 }
 
 pub async fn start_db<P>(dir: P) -> Result<MoreThanText, MTTError>