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Faster campaigns test. Part 4. Reorganise tests.

Administrator requested to merge mrn/faster-tests-4 into main

Created by: mrnugget

This fixes https://github.com/sourcegraph/sourcegraph/issues/16320 and is the final PR in this sprint for this.

This is not such a big speedup, but it does get rid of a few heavy tests that we've now covered with faster unit tests:

  • it splits up the old TestReconcilerProcess test into a reconciler integration test that does one high-level test to make sure DeterminePlan and executor.ExecutePlan are called correctly and everything is persisted
  • the other test is TestExecutor_ExecutePlan which is easier to maintain and to extend, since it doesn't need previous+current spec as input, but a changeset and a ReconcilerPlan
  • it also extends the DeterminePlan tests to make sure that all tests are covered

Both TestExecutor_ExecutePlan and TestDeterminePlan are really easy to extend. Thanks again to @eseliger for coming up with this architecture that makes this so easy!

We're now at ~7s, down from ~15s:

$ for i in $(seq 0 5); do time go test ./enterprise/internal/campaigns -count=1; done
ok      github.com/sourcegraph/sourcegraph/enterprise/internal/campaigns        7.474s
go test ./enterprise/internal/campaigns -count=1  5.22s user 2.39s system 75% cpu 10.095 total
ok      github.com/sourcegraph/sourcegraph/enterprise/internal/campaigns        7.486s
go test ./enterprise/internal/campaigns -count=1  5.34s user 2.32s system 76% cpu 10.023 total
ok      github.com/sourcegraph/sourcegraph/enterprise/internal/campaigns        7.433s
go test ./enterprise/internal/campaigns -count=1  5.46s user 2.39s system 79% cpu 9.934 total
ok      github.com/sourcegraph/sourcegraph/enterprise/internal/campaigns        7.497s
go test ./enterprise/internal/campaigns -count=1  5.36s user 2.27s system 76% cpu 9.982 total
ok      github.com/sourcegraph/sourcegraph/enterprise/internal/campaigns        7.410s
go test ./enterprise/internal/campaigns -count=1  5.43s user 2.36s system 78% cpu 9.928 total
ok      github.com/sourcegraph/sourcegraph/enterprise/internal/campaigns        7.562s
go test ./enterprise/internal/campaigns -count=1  5.45s user 2.36s system 76% cpu 10.161 total

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