## Changes
The `acc` package is exclusively used by integration tests, so it
belongs under `integration/internal`.
It's not the best name we can rename later.
## Tests
n/a
## Changes
Objectives:
* A dedicated directory for integration tests
* It is not picked up by `go test ./...`
* No need for a `TestAcc` test name prefix
* More granular packages to improve test selection (future)
The tree structure generally mirrors the source code tree structure.
Requirements for new files in this directory:
* Every package **must** be named after its directory with `_test` appended
* Requiring a different package name for integration tests avoids
aliasing with the main package.
* Every integration test package **must** include a `main_test.go` file.
These requirements are enforced by a unit test in the `integration` package.
## Tests
Integration tests pass.
The total run time regresses by about 10%. A follow-up change that
increases the degree of test parallelism will address this.
Pieter Noordhuis