(#2608) - race condition in sync replication test

lib/adapters/leveldb.js

diff --git a/lib/adapters/leveldb.js b/lib/adapters/leveldb.js
index 5cd7223..d284c96 100644
--- a/lib/adapters/leveldb.js
+++ b/lib/adapters/leveldb.js
@@ -987,15 +987,19 @@
   opts = utils.clone(opts);
 
   var leveldown = opts.db || originalLeveldown;
-  if (typeof leveldown.destroy !== 'function') {
-    leveldown.destroy = function (name, cb) { cb(); };
+  function callDestroy(name, cb) {
+    if (typeof leveldown.destroy === 'function') {
+      leveldown.destroy(name, cb);
+    } else {
+      process.nextTick(callback);
+    }
   }
 
   var dbStore;
   if (dbStores.has(leveldown.name)) {
     dbStore = dbStores.get(leveldown.name);
   } else {
-    dbStore = new utils.Map();
+    return callDestroy(name, callback);
   }
 
   if (dbStore.has(name)) {
@@ -1004,10 +1008,10 @@
 
     dbStore.get(name).close(function () {
       dbStore.delete(name);
-      leveldown.destroy(name, callback);
+      callDestroy(name, callback);
     });
   } else {
-    leveldown.destroy(name, callback);
+    callDestroy(name, callback);
   }
 });
 

tests/test.sync.js

diff --git a/tests/test.sync.js b/tests/test.sync.js
index b537a0e..d373fbd 100644
--- a/tests/test.sync.js
+++ b/tests/test.sync.js
@@ -252,7 +252,7 @@
     it('Push and pull changes both fire (issue 2555)', function (done) {
       var db = new PouchDB(dbs.name);
       var remote = new PouchDB(dbs.remote);
-
+      var correct = false;
       db.post({}).then(function () {
         return remote.post({});
       }).then(function () {
@@ -269,8 +269,12 @@
             lastChange.should.not.equal(change.direction);
           }
           if (++numChanges === 2) {
-            done();
+            correct = true;
+            sync.cancel();
           }
+        }).on('complete', function () {
+          correct.should.equal(true, 'things happened right');
+          done();
         });
       });
     });