Ok. I figured it was worth a try ... of illustrating a slightly different approach that can benefit from use of the Dart Editor:
- outline mode (see the example below)
- editor view fold feature (the minus inside a circle in the left margin)

Some of the main test functions are monolithic: e.g. **`main()` is 1500 lines in `ng_model_spec.dart`**, and the Dart Editor can't help navigating it (other than just scrolling).

Using a class allows the test fixture to be set as fields and each second-level `describe()` as a method, which makes it easier to visualize grouping: e.g.,
![image](https://cloud.githubusercontent.com/assets/4140793/2581301/e198e356-b9b6-11e3-83e1-09c007bf9664.png)