NODE-520 test to reproduce issue, passing

Author: christkv

test/functional/gridfs_tests.js

@@ -3042,3 +3042,47 @@ exports['should correctly seek on file where size of file is a multiple of the c
     });
   }
 }
+
+/**
+ * @ignore
+ */
+exports['should correctly write fake png to gridstore'] = {
+  metadata: { requires: { topology: ['single', 'replicaset', 'sharded', 'ssl', 'heap', 'wiredtiger'] } },
+
+  // The actual test we wish to run
+  test: function(configuration, test) {
+    var MongoClient = configuration.require.MongoClient
+      , GridStore = configuration.require.GridStore
+      , ObjectID = configuration.require.ObjectID
+      , fs = require('fs')
+      , assert = require('assert');
+
+    // Connection URL
+    var url = 'mongodb://localhost:27017/myproject';
+    var id = new ObjectID();
+
+    // Create a test buffer
+    var buffer = new Buffer(200033);
+
+    // Use connect method to connect to the Server
+    MongoClient.connect(configuration.url(), function(err, db) {
+      assert.equal(null, err);
+
+      var gridStore = new GridStore(db, new ObjectID(), 'w', { "content_type": "image/png", "chunk_size": 1024*4 });
+      gridStore.open(function(err, gridStore) {
+        test.equal(null, err);
+
+        gridStore.write(buffer, function(err, result) {
+          test.equal(null, err);
+  
+          gridStore.close(function(err, result) { 
+            test.equal(null, err);
+
+            db.close();
+            test.done();
+          });
+        });
+      });
+    });
+  }
+}