Adds tests, one test-kit builder and goldens only; no production file
changes.
TestPlanLaddersGolden builds three ladders (Hosting with Basic and Shared,
Support with Shared, Empty with no tier), five products (a shared one, an
add-on, one with no category, a draft), three organization types (defaulting
to Hosting, to nothing and to the empty ladder) and an organization holding
Basic, and compares with files under testdata/operator_plan_ladders: the
topology's columns, rank rows, shared products, off-ladder strip and type
summary together with the ladder list (page); the ladder page's tiers with
their organization counts (detail); and the reorder preview's order for the
ladder's own order (preview). The page lists every ladder in the database, so
the files hold the fixture's ladders, products and types. The properties
subtest holds the whole grid to the ladders' own reads: rows ascend by rank,
every row has one cell per column, and every column, the fixture's or not,
counts what CountActiveAttachmentsByLadder returns and holds the tiers
ListTiersByLadderWithProducts returns. Each file was read against the fixture
before it was committed; a type whose default ladder has no rank-0 tier reads
as no default.
TestPlanLaddersReadFailures pins, per read (ladder listing, shared products,
ladder counts, tier reads, product list, rank-0 listing, organization types,
tier counts on the ladder page and in the preview), what the pages show when
that read fails.
world gains AddTier. The read-count table gains plan-ladders (4 reads per
ladder), plan-ladder-detail (1 per tier) and tier-reorder-preview (2 per
tier), each as the plan predicted; the table's request can now be a POST.
Names and results of ./internal/server and ./internal/testkit/... match the
parent apart from the new tests, which pass: TestPlanLaddersGolden and its
four subtests, TestPlanLaddersReadFailures and its nine, and the three
read-count rows. A second run without -update leaves the tree unchanged, and
the tests pass three runs in a row after a reset. Thirty-two edits to the
topology and the ladder code, each breaking one fact, fail the test that names
it.
Unprobed: each column's and list row's IsActive and description, the org-type
summary's display names (moved unchanged); the list's name filter and paging,
which no section of this step edits; the order of same-named products in the
shared index, which is unspecified today and which no section of this step
fixes; the reorder preview's classification path (rank 0 does not change in the
fixture); the topology's template rendering, which its own tests keep.
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