Add failing test for nested array

test/nested-documentarray.test.js

@@ -0,0 +1,63 @@
+'use strict';
+
+const start = require('./common');
+
+const assert = require('assert');
+const co = require('co');
+const util = require('./util');
+
+const mongoose = start.mongoose;
+const Schema = mongoose.Schema;
+
+describe('Nested arrays', function() {
+
+  this.timeout(5000);
+
+  let db;
+
+  before(function() {
+    db = start();
+  });
+
+  after(function(done) {
+    db.close(done);
+  });
+
+  beforeEach(() => db.deleteModel(/.*/));
+  afterEach(() => util.clearTestData(db));
+  afterEach(() => util.stopRemainingOps(db));
+
+  it('Works as expected', function() {
+    const SubchildSchema = new Schema({ title: String });
+
+    const ChildSchema = new Schema({
+      subchilds: [[SubchildSchema]]
+    });
+
+    const ParentModel = db.model(
+      'Parent',
+      { children: [ChildSchema] }
+    );
+
+    return co(function* () {
+      const { _id } = yield ParentModel.create({
+        children: [
+          {
+            subchilds: [
+              [{}]
+            ]
+          }
+        ]
+      });
+
+      const parent = yield ParentModel.findById(_id);
+
+      parent.children[0].subchilds[0][0].title = 'hello world';
+
+      const saved = yield parent.save();
+
+      assert.strictEqual(saved.children[0].subchilds[0][0].title, 'hello world');
+    });
+
+  });
+});