diff --git a/lib/customUtils.js b/lib/customUtils.js
index 53109a2..1a20c0a 100644
--- a/lib/customUtils.js
+++ b/lib/customUtils.js
@@ -18,16 +18,6 @@ function uid (len) {
 }
 
 
-function ensureFileDoesntExist (file, callback) {
-  fs.exists(file, function (exists) {
-    if (!exists) { return callback(null); }
-    
-    fs.unlink(file, function (err) { return callback(err); });
-  });
-}
-
-
 // Interface
 module.exports.uid = uid;
-module.exports.ensureFileDoesntExist = ensureFileDoesntExist;
 
diff --git a/test/customUtil.test.js b/test/customUtil.test.js
index 0bca55d..cb69def 100644
--- a/test/customUtil.test.js
+++ b/test/customUtil.test.js
@@ -7,29 +7,20 @@ var should = require('chai').should()
 
 describe('customUtils', function () {
 
-  describe('ensureFileDoesntExist', function () {
-  
-    it('Doesnt do anything if file already doesnt exist', function (done) {
-      customUtils.ensureFileDoesntExist('workspace/nonexisting', function (err) {
-        assert.isNull(err);
-        fs.existsSync('workspace/nonexisting').should.equal(false);
-        done();
-      });
-    });
+  describe('uid', function () {
 
-    it('Deletes file if it exists', function (done) {
-      fs.writeFileSync('workspace/existing', 'hello world', 'utf8');
-      fs.existsSync('workspace/existing').should.equal(true);
-    
-      customUtils.ensureFileDoesntExist('workspace/existing', function (err) {
-        assert.isNull(err);
-        fs.existsSync('workspace/existing').should.equal(false);
-        done();
-      });
+    it('Generates a string of the expected length', function () {
+      customUtils.uid(3).length.should.equal(3);
+      customUtils.uid(16).length.should.equal(16);
+      customUtils.uid(42).length.should.equal(42);
+      customUtils.uid(1000).length.should.equal(1000);
     });
-    
-  });
 
+    // Very small probability of conflict
+    it('Generated uids should not be the same', function () {
+      customUtils.uid(56).should.not.equal(customUtils.uid(56));
+    });
 
+  });
 
 });
diff --git a/test/persistence.test.js b/test/persistence.test.js
index 0f1b73e..b98bab8 100644
--- a/test/persistence.test.js
+++ b/test/persistence.test.js
@@ -491,9 +491,9 @@ describe('Persistence', function () {
       var dbFile = 'workspace/test2.db', theDb, theDb2, doc1, doc2;
       
       async.waterfall([
-        async.apply(customUtils.ensureFileDoesntExist, dbFile)
-      , async.apply(customUtils.ensureFileDoesntExist, dbFile + '~')
-      , async.apply(customUtils.ensureFileDoesntExist, dbFile + '~~')
+        async.apply(Persistence.ensureFileDoesntExist, dbFile)
+      , async.apply(Persistence.ensureFileDoesntExist, dbFile + '~')
+      , async.apply(Persistence.ensureFileDoesntExist, dbFile + '~~')
       , function (cb) {
         theDb = new Datastore({ filename: dbFile });
         theDb.loadDatabase(cb);
@@ -617,4 +617,29 @@ describe('Persistence', function () {
   
   });   // ==== End of 'Prevent dataloss when persisting data' ====
 
+
+  describe('ensureFileDoesntExist', function () {
+  
+    it('Doesnt do anything if file already doesnt exist', function (done) {
+      Persistence.ensureFileDoesntExist('workspace/nonexisting', function (err) {
+        assert.isNull(err);
+        fs.existsSync('workspace/nonexisting').should.equal(false);
+        done();
+      });
+    });
+
+    it('Deletes file if it exists', function (done) {
+      fs.writeFileSync('workspace/existing', 'hello world', 'utf8');
+      fs.existsSync('workspace/existing').should.equal(true);
+    
+      Persistence.ensureFileDoesntExist('workspace/existing', function (err) {
+        assert.isNull(err);
+        fs.existsSync('workspace/existing').should.equal(false);
+        done();
+      });
+    });
+    
+  });   // ==== End of 'ensureFileDoesntExist' ====
+
+
 });