Safety Delta-Delta: test evidence

Requirement-traced qualification evidence for the safety.viz delta-delta module.

Requirement matrix ↗ — the reviewed source specification these tests trace to.

Scope: 30 coverage rows44 distinct requirement IDs
Tests executed: 147 automated checks25 browser · 122 unit
Result: pass all passing6 evidence screenshots
Generated: 2026-07-12 05:50 UTC
Environment: linux 6.17.0-1018-azure · node v22.23.1 · playwright 1.61.1 · chromium 149.0.7827.55
Test run: Actions run #29181741704

Scope & approach

Traceability for the delta-delta module (a Chart.js reimplementation of RhoInc/safety-delta-delta, matching behavior), built under #25 per the convention in CONTRIBUTING.md. Requirement IDs come from the reviewed 48-row matrix at safety.agent docs/requirements/safety-delta-delta.md, whose Evidence Type column routes rows (unit → Vitest, browser → Playwright). The renderer flattens long-format results (one row per measurement at a visit) to one point per participant: change in measure X (comparison-visit mean − baseline-visit mean) against change in measure Y.

Each table row traces one requirement to the automated test(s) that evidence it: the requirement ID and its source-matrix rows link back to the reviewed specification, the issue column links the implementing work, and the result column shows the recorded outcome of every matching test from the committed evidence.json with its captured screenshots. Browser evidence is captured at fixed conditions (1280×800, device scale 1) on the canonical Linux CI environment.

Browser evidence (Playwright — `tests/e2e/delta-delta.spec.js`)

16 requirement rows · 16 tests

Requirement	Source matrix rows	Issue	Tests & evidence
SDD-FUNC-001/SDD-FUNC-002/SDD-FUNC-003	SDD-FUNC-001, SDD-FUNC-002, SDD-FUNC-003	#25	pass SDD-FUNC-001/SDD-FUNC-002/SDD-FUNC-003: renders visit, measure, filter, and display controls (#25)
SDD-FUNC-002/SDD-REG-003	SDD-FUNC-002, SDD-REG-003	#25	pass SDD-FUNC-002/SDD-REG-003: defaults to the first/second measure and first/last visit, plotting one point per participant (#25)
SDD-FUNC-004	SDD-FUNC-004	#25	pass SDD-FUNC-004: the participant-count note reports the total and percentage shown (#25)
SDD-REG-008	SDD-REG-008	#25	pass SDD-REG-008: missing/non-numeric results are dropped with a reported count and visible note (#25)
SDD-REG-001	SDD-REG-001	#25	pass SDD-REG-001: changing the Y measure changes the plotted distribution (#25)
SDD-REG-002	SDD-REG-002	#25	pass SDD-REG-002: changing the comparison visit changes the plotted distribution (#25)
SDD-REG-006/SDD-REG-005	SDD-REG-005, SDD-REG-006	#25	pass SDD-REG-006/SDD-REG-005: a filter narrows the plotted points and updates the count (#25)
SDD-FUNC-005	SDD-FUNC-005	#25	pass SDD-FUNC-005: the tooltip reports the participant ID and both change values (#25)
SDD-FUNC-006/SDD-REG-011/016/018/019/020/024	SDD-FUNC-006, SDD-REG-011, SDD-REG-016, SDD-REG-018, SDD-REG-019, SDD-REG-020, SDD-REG-024	#25	pass SDD-FUNC-006/SDD-REG-011/SDD-REG-016/SDD-REG-018/SDD-REG-019/SDD-REG-020/SDD-REG-024: clicking a point opens the linked measure table (#25)
SDD-REG-021/022/025	SDD-REG-021, SDD-REG-022, SDD-REG-025	#25	pass SDD-REG-021/SDD-REG-022/SDD-REG-025: change values are signed and colored, with axis tags (#25)
SDD-REG-012/SDD-REG-013	SDD-REG-012, SDD-REG-013	#25	pass SDD-REG-012/SDD-REG-013: the clicked point is highlighted and clicking another redraws the table (#25)
SDD-REG-014	SDD-REG-014	#25	pass SDD-REG-014: changing a control removes the detail table (#25)
SDD-REG-026	SDD-REG-026	#25	pass SDD-REG-026: the regression line toggles with an equation and R² note (#25)
SDD-REG-007	SDD-REG-007	#25	pass SDD-REG-007: a filter for a non-existent variable logs a console warning (#25)
SDD-REG-010	SDD-REG-010	#25	pass SDD-REG-010: a non-existent required column errors into the container and tears the chart down (#25)
SDD-API-001 (module scheme)	— (see legacy-API note)	#25	pass SDD-API-001: lifecycle API supports init, setData, setSettings, render, resize, and destroy (#25)

Unit evidence (Vitest — `tests/unit/delta-delta/`)

14 requirement rows · 30 tests

Requirement	Source matrix rows	Issue	Tests & evidence
SDD-CFG-004..008	SDD-CFG-004, SDD-CFG-005, SDD-CFG-006, SDD-CFG-007, SDD-CFG-008	#25	`configure.test.js` pass delta-delta configure SDD-CFG-004/005/006/007/008: default column mappings match the data contract (#25) pass delta-delta structureData SDD-CFG-004: getMeasures returns the sorted distinct measures (#25) pass delta-delta structureData SDD-CFG-008: getVisits orders visits by the numeric visit column (#25)
SDD-CFG-009..013	SDD-CFG-009, SDD-CFG-010, SDD-CFG-011, SDD-CFG-012, SDD-CFG-013	#25	`configure.test.js` pass delta-delta configure SDD-CFG-009/010/011/012/013: measure and visit selections default to data-driven (#25) pass delta-delta configure SDD-CFG-012/013: baseline/comparison visit scalars are coerced to arrays (#25)
SDD-CFG-014/SDD-CFG-015	SDD-CFG-014, SDD-CFG-015	#25	`configure.test.js` pass delta-delta configure SDD-CFG-014: arrayify and fieldSpec normalize helpers behave (#25) pass delta-delta configure SDD-CFG-014: filters accept strings and objects, normalized to { value_col, label } (#25) pass delta-delta configure SDD-CFG-015: details default to Participant ID plus the filter columns (#25) pass delta-delta configure SDD-CFG-015: supplied details extend the defaults without duplicating (#25)
SDD-REG-003 (delta math)	SDD-REG-003	#25	`structureData.test.js` pass delta-delta getScales SDD-REG-003: axis labels describe the change in the selected measure (#25) pass delta-delta structureData SDD-REG-003: plotted deltas are comparison minus baseline per measure (#25)
SDD-FUNC-001/SDD-REG-004 (average)	SDD-FUNC-001, SDD-REG-004	#25	`structureData.test.js` pass delta-delta structureData SDD-FUNC-001/SDD-REG-004: multiple baseline visits are averaged (#25)
SDD-REG-008 (removal)	SDD-REG-008	#25	`structureData.test.js` pass delta-delta structureData SDD-REG-008: missing/non-numeric results are removed with a count (#25)
SDD-REG-019/022/023/025	SDD-REG-019, SDD-REG-022, SDD-REG-023, SDD-REG-025	#25	`structureData.test.js` pass delta-delta getScales SDD-REG-022: a missing change value renders as NA (#25) pass delta-delta structureData SDD-REG-019/025: measure rows sort X-measure, Y-measure, then alphabetical, tagged by axis (#25) pass delta-delta structureData SDD-REG-022: a participant missing the comparison result yields a non-plottable NaN delta (#25) pass delta-delta structureData SDD-REG-023: sparkline records are visit-ordered and role-colored (#25)
SDD-REG-006 (filters)	SDD-REG-006	#25	`structureData.test.js` pass delta-delta structureData SDD-REG-006: filters keep only the participants whose metadata matches (#25)
SDD-REG-021/022 (format/color)	SDD-REG-021, SDD-REG-022	#25	`getScales.test.js` pass delta-delta getScales SDD-REG-021: change values format with an explicit sign and two decimals (#25) pass delta-delta getScales SDD-REG-021/022: change values are colored by sign, gray for zero/NA (#25) pass delta-delta getScales SDD-REG-022: a missing change value renders as NA (#25) pass delta-delta structureData SDD-REG-022: a participant missing the comparison result yields a non-plottable NaN delta (#25)
SDD-REG-015 (axis padding)	SDD-REG-015	#25	`getScales.test.js` pass delta-delta getScales SDD-REG-015: an empty or flat domain falls back to a finite window (#25) pass delta-delta getScales SDD-REG-015: the delta domain includes 0 and pads beyond the data extent (#25)
SDD-REG-026 (regression)	SDD-REG-026	#25	`getPlugins.test.js` pass delta-delta getPlugins SDD-REG-026: linear regression matches a hand-computed non-trivial fit (#25) pass delta-delta getPlugins SDD-REG-026: linear regression recovers a perfect fit (#25) pass delta-delta getPlugins SDD-REG-026: regression is null without a resolvable fit (#25)
SDD-FUNC-004 (count text)	SDD-FUNC-004	#25	`getPlugins.test.js` pass delta-delta getPlugins SDD-FUNC-004: participant count text reports total and percentage to one decimal (#25)
SDD-REG-012 (selection)	SDD-REG-012	#25	`getPlugins.test.js` pass delta-delta getPlugins SDD-REG-012: selection borders thicken and blacken the selected point only (#25)
SDD-DATA-001/SDD-REG-010 (guard)	SDD-DATA-001, SDD-REG-010	#25	`checkInputs.test.js` pass delta-delta checkInputs SDD-DATA-001: valid long-format data with the required columns passes (#25) pass delta-delta checkInputs SDD-REG-010: an empty dataset reports every required column missing (#25) pass delta-delta checkInputs SDD-REG-010: missing a required mapped column throws a named error (#25)

Visual evidence

Every screenshot below is a committed baseline: the same PNG is the visual-regression baseline the browser suite asserts against and the evidence artifact shown here. Click any capture for the full-resolution image.

SDD FUNC 001 control panel
SDD FUNC 002 baseline scatter
SDD FUNC 006 measure table
SDD REG 008 invalid data note
SDD REG 012 point selected
SDD REG 026 regression line

Source-matrix routing status (48 rows)

Fully evidenced (44 rows): SDD-FUNC-001..006, SDD-REG-001..008, SDD-REG-010..014, SDD-REG-016..026, SDD-DATA-001, SDD-CFG-004..015. Each maps to a browser and/or unit test above. SDD-REG-017 (details metadata above the table) is evidenced by the participant-detail header, which renders every configured details column.
Partial / addressed by implementation (2 rows): - SDD-REG-009 — the initial X/Y measure is honored (measure_x / measure_y, verified via the default-selection browser test and configure), but the row's "with units attached" clause is descoped: the original renderer labels measures by their bare measure_col value, so unit-suffixed measure labels are intentionally not reproduced. - SDD-REG-015 ("points are not cut off on the edge of the chart") — the delta domain includes 0 and pads beyond the data extent (deltaDomain, unit tested) and the chart adds layout padding, so edge points render inside the frame. No pixel-level assertion is made; this is a visual acceptance item.
Descoped — legacy Webcharts API/config (2 rows): SDD-CFG-001 and SDD-CFG-002 describe configuring the chart as a Webcharts chart object with webchartsSettings.js. Per the cross-renderer legacy-API decision (design #2), the nextgen module does not preserve the Webcharts configuration surface; it ships flat DEFAULT_SETTINGS (documented in the API reference) instead.

Legacy-API note: source-matrix SDD-API-001 ("a factory to create a custom Webcharts chart object") describes the legacy Webcharts API, which the designs intentionally do not preserve. The module ships the histogram's proven lifecycle API instead — deltaDelta(element, settings) returning an instance with init/setData/setSettings/render/resize/destroy — evidenced as SDD-API-001 in the module scheme above.

Removed/merged upstream (AI review): SDD-CFG-003, SDD-CFG-016, SDD-API-002, SDD-REQ-001, and SDD-REQ-002 were dropped in the safety.agent matrix review as introductory/aggregate text or navigation artifacts, and are not counted in the 48 rows.

Reproducing this report

The evidence set is regenerated from a full test run and committed with the code it qualifies; CI fails when they drift. To verify or rebuild it:

npm ci
npm run evidence:check   # compare a fresh run against the committed evidence
npm run evidence         # regenerate docs/evidence/delta-delta/evidence.json

Screenshot baselines are canonical to the Linux CI runner; the repository's Update evidence baselines workflow is the authoritative way to refresh them. See CONTRIBUTING.md for the traceability convention.