Three tests each called newEnv, and newEnv built the binary, so the same
binary was linked three times - about 17 seconds of the run, measured. A
binary is read-only and there is nothing to isolate between tests; each test
still gets its own directory and its own database. The package now builds it
on the first test that needs one and removes it in TestMain. The suite goes
from 39 seconds to 9.
The three assertion blocks listed the same six queries, two or three times
each, differing only in the counts expected - so renaming a table meant
finding three places. They now share one list, with a flag for the uninstall's
"all of them at zero". The reinstall check gets stronger on the way past: it
was three of the six and is now all six.
The per-call sql.Open in count and exec stays. It looks like waste and is not:
the binary under test writes the same file, and a connection held open across
a run of it is a second writer for nothing. The shared part is factored out;
the opening is still per call, and the comment now says why.
Everything under `migrate install` was covered with an injected engine and a
hand-built schema, which is where the shapes belong. What none of it could
catch is the wiring: whether an application's init() reaches both registries,
whether the installer finds a manifest through app.Snapshot, whether the
seeder writes what the uninstaller goes looking for, and whether the command
exits non-zero when a migration fails - which a deployment reads to decide
whether to start the new version.
This builds a go-admin binary with the example application linked in, migrates
a real database with it, and drives the whole sequence: framework migrations
only, install, install again, put a row in the application's own table,
uninstall, reinstall.
It lives in its own module. A tagged import in the main module would still be
resolved by `go mod tidy`, which considers every build tag and would go
looking for github.com/go-admin-team/example-app-order on the network - a
repository that does not exist, because the example is a directory inside this
one. That was checked rather than assumed: tidy fails there with "Repository
not found". A build tag of `ignore` is skipped by tidy but cannot be turned on
either, because the standard library uses it for files that are not meant to
build at all. A separate module with replace directives is invisible to the
main module's tidy, its build, its tests and checksilent, and needs no
go.work.
Three degradations turn it red: the example application not registering a
manifest, the uninstall not clearing sys_migration - where the reinstall then
seeds nothing and the assertion reads "menus = 0, want 4" - and the seeder not
recording its grants, where the uninstall then leaves every policy behind.
zhangwenjian