Same fix for write.test.js.

test/write.test.js

@@ -30,9 +30,7 @@ exports['test mbtiles file creation'] = function(beforeExit) {
             // Flip Y coordinate because file names are TMS, but .putTile() expects XYZ.
             coords[2] = Math.pow(2, coords[3]) - 1 - coords[2];
 
-            fs.readFile(__dirname + '/fixtures/images/' + file, function(err, tile) {
-                if (err) throw err;
-
+            var tile = fs.readFileSync(__dirname + '/fixtures/images/' + file);
             mbtiles.putTile(coords[3] | 0, coords[1] | 0, coords[2] | 0, tile, function(err) {
                 if (err) throw err;
                 completed.written++;
@@ -44,7 +42,6 @@ exports['test mbtiles file creation'] = function(beforeExit) {
                     });
                 }
             });
-            });
         }
 
         function verifyWritten() {