[zzylol]

Why

Three DAG viewer tests fail on main against main's own committed example documents (cd tools/dag-viewer && python3 -m unittest test_viewer). The documents are current (cargo test -p asap-devtools --test stage_pipeline passes); the assertions still describe plans from before #855 and #884.

What

Updates three assertions in tools/dag-viewer/test_viewer.py to the plans the planner now selects. No viewer code or example document changes.

Test	Old expectation	Current output	Changed by
test_doc_parameter_opens_one_document_with_the_selected_plan	lane 1 shows L1	example 1 selects P3-m1, from L3 (shared Scan and TimeRange for Q1 and Q2)	#855 (shared non-summary node built once per evaluation)
test_each_node_lists_the_queries_reaching_it_and_shared_nodes_say_so	one SummaryMerge shared by q3, q4	one SummaryMerge shared by q3, q4, q5 (all read the same 100 s window of one per-series DDSketch pane chain)	#855
test_search_header_groups_discards_by_cause	"2 independent components searched separately"	search report has components: [] and searched_as_one: not_in_joint_space: #884 finds components, but their combined plan is not in the joint search space (exact top-k reuse is not combined with panes), so the workload is searched as one (same plan cost, 1.576e-6)	#884 (components split by the nodes queries can share)

How

• The selected-plan test now looks up the selected physical candidate's from_logical and checks lane 1 shows it (pinned to L3), instead of a hard-coded L1.
• The shared-node test expects the q3-q5 merge, labelled "shared ×3".
• The search-header test pins searched_as_one: not_in_joint_space and checks that no component count is shown when the workload is searched as one. The component line itself stays covered by DefaultSearchTests.test_header_names_the_search_and_its_components (two queries over two metrics).

Key code interfaces added / modified

None (tests only).

Major algorithm changes

None.

Before this PR

python3 -m unittest test_viewer on main: 2 failures, 1 error.

After this PR

The viewer's Python tests pass on main's committed documents.

Verification

At 134f600:

• python3 -m unittest test_viewer test_server (with a built stage_pipeline, so nothing skipped): 94 tests OK.
• node stages.test.mjs (Node 22): 0 failures.
• cargo test -p asap-devtools --test stage_pipeline: 36 passed, including the check that committed examples are current.
• Bisected: the selected-plan and shared-merge tests pass at 939e6ed and fail from 4ba995e (feat(stage2): offer a shared non-summary node built once per evaluation #855); the search-header test fails from 4535c95 (Joint planning search: interchangeable queries take one choice; components split by the nodes queries can share #884).