test: add coverage for agg cursor

Author: vkarpov15

lib/aggregate.js

@@ -17,7 +17,7 @@ module.exports = collection => {
       action.params.push({});
     }
     action.chained.forEach(function(chained) {
-      action.params[1][name] = chained.params[0];
+      action.params[1][chained.name] = chained.params[0];
     });
     return action;
   });

test/collection.test.js

@@ -69,6 +69,24 @@ describe('Collection', function() {
       assert.equal(res[0].y, 1);
       assert.equal(res[1].y, 2);
     });
+
+    it('cursor', async function() {
+      const Test = db.collection('Test');
+
+      await Test.insertOne({ x: 1 });
+      await Test.insertOne({ x: 2 });
+
+      const cursor = await Test.aggregate([
+        { $project: { y: '$x' } },
+        { $sort: { y: 1 } }
+      ]).cursor();
+
+      let ys = [];
+      for (let doc = await cursor.next(); doc != null; doc = await cursor.next()) {
+        ys.push(doc.y);
+      }
+      assert.deepEqual(ys, [1, 2]);
+    });
   });
 
   describe('#insertOne()', function() {