add unit test for proxying revenue object

Author: djih

test/snippet-tests.js

@@ -24,4 +24,12 @@ describe('Snippet', function() {
     assert.deepEqual(identify._q[2], ['add', 'key3', 2]);
     assert.deepEqual(identify._q[3], ['setOnce', 'key4', 'value2']);
   });
+
+  it('amplitude object should proxy Revenue object and calls', function() {
+    var revenue = new amplitude.Revenue().setProductId('productIdentifier').setQuantity(5).setPrice(10.99);
+    assert.lengthOf(revenue._q, 3);
+    assert.deepEqual(revenue._q[0], ['setProductId', 'productIdentifier']);
+    assert.deepEqual(revenue._q[1], ['setQuantity', 5]);
+    assert.deepEqual(revenue._q[2], ['setPrice', 10.99]);
+  });
 });