# [Greenline] Integrate JW testcase

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- Shaped by: Magdalena, Chia Rui
- Appetite (FTEs, weeks): 1/2 cycle
- Developers: Chia Rui<!-- Filled in at the betting table unless someone is specifically required here -->

## Problem
<!-- The raw idea, a use case, or something we’ve seen that motivates us to work on this -->
Functionality for the Jablonowski Williamson test case still lives on a separate branch and needs to be merged back into `icon4py` main.

## Appetite
<!-- Explain how much time we want to spend and how that constrains the solution -->
1/2 cycle
## Solution
<!-- The core elements we came up with, presented in a form that’s easy for people to immediately understand -->
Split changes in to roughly 3 PRs:
- backend and modifications for stencils: [PR](https://github.com/C2SM/icon4py/pull/412)
- initial conditions for Jablonowski Williamson:
- time step tests: extensions for global grid:

## Rabbit holes
<!-- Details about the solution worth calling out to avoid problems -->
check for conflicts with [this PR](https://github.com/C2SM/icon4py/pull/402)

## No-gos
<!-- Anything specifically excluded from the concept: functionality or use cases we intentionally aren’t covering to fit the ## appetite or make the problem tractable -->

## Progress
<!-- Don't fill during shaping. This area is for collecting TODOs during building. As first task during building add a preliminary list of coarse-grained tasks for the project and refine them with finer-grained items when it makes sense as you work on them. -->

- [x] stencils with backend ([PR#412](https://github.com/C2SM/icon4py/pull/412))
- [ ] Task 2

- [ ] Discovered Task 3
- [ ] Subtask L
- [ ] Subtask S
- [ ] Task 4