I actually have two projects that use this approach, FeebDB (which is the library I wrote to manage a "one SQLite database per client" approach) and HackerExperience (a game under development that uses FeebDB).
The overall idea is simple:
1. Before tests start running, create a prop of each database.
2. The prop contains the "starting database" for each test. It may contain seed data (optional).
3. For each test, copy the prop and assign it a unique shard identifier (say, cp /props/user.db /test_data/user/874125.db).
4. The test knows the `shard_id` and can do whatever it wants with it; no one else will bother it.
5. Once ExUnit is finished, delete all shards.
Both projects follow a similar approach (I wrote it first in FeebDB and copied into HackerExperience, which has some sections commented out -- I need to clean up this part of the codebase).
For both projects, you will find steps 1/5 in `test/support/db.ex`, step 2 in `test/support/db/prop.ex` and steps 3/4 in `test/support/case/db.ex`.
I actually have two projects that use this approach, FeebDB (which is the library I wrote to manage a "one SQLite database per client" approach) and HackerExperience (a game under development that uses FeebDB).
The overall idea is simple:
1. Before tests start running, create a prop of each database.
2. The prop contains the "starting database" for each test. It may contain seed data (optional).
3. For each test, copy the prop and assign it a unique shard identifier (say, cp /props/user.db /test_data/user/874125.db).
4. The test knows the `shard_id` and can do whatever it wants with it; no one else will bother it.
5. Once ExUnit is finished, delete all shards.
Both projects follow a similar approach (I wrote it first in FeebDB and copied into HackerExperience, which has some sections commented out -- I need to clean up this part of the codebase).
For both projects, you will find steps 1/5 in `test/support/db.ex`, step 2 in `test/support/db/prop.ex` and steps 3/4 in `test/support/case/db.ex`.
- FeebDB: https://github.com/renatomassaro/FeebDB/
- HackerExperience: https://github.com/HackerExperience/HackerExperience/
Email is in profile in case you have follow up questions/comments :)