diff --git a/lib/datastore.js b/lib/datastore.js
index 7ca8226..0c52534 100644
--- a/lib/datastore.js
+++ b/lib/datastore.js
@@ -341,7 +341,7 @@ Datastore.prototype._insertMultipleDocsInCache = function (newDocs) {
   var i, failingI, error
     , preparedDocs = this.prepareDocumentForInsertion(newDocs)
     ;
-  
+
   for (i = 0; i < preparedDocs.length; i += 1) {
     try {
       this.addToIndexes(preparedDocs[i]);
diff --git a/test/.db.test.js.swo b/test/.db.test.js.swo
new file mode 100644
index 0000000..fb62a53
Binary files /dev/null and b/test/.db.test.js.swo differ
diff --git a/test/db.test.js b/test/db.test.js
index a02bf3d..4ae60e4 100644
--- a/test/db.test.js
+++ b/test/db.test.js
@@ -257,8 +257,11 @@ describe('Database', function () {
         err.errorType.should.equal('uniqueViolated');
       
         d.find({}, function (err, docs) {
+          // Datafile only contains index definition
+          var datafileContents = model.deserialize(fs.readFileSync(testDb, 'utf8'));
+          assert.deepEqual(datafileContents, { $$indexCreated: { fieldName: 'a', unique: true } });
+
           docs.length.should.equal(0);
-          fs.readFileSync(testDb, 'utf8').length.should.equal(0);   // Datafile not written to
 
           done();
         });