SemiAnalysisAI
diff --git a/‎packages/app/src/components/inference/ui/ScatterGraph.decoration.test.tsx‎
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+// @vitest-environment jsdom
+/**
+ * Integration tests for the ScatterGraph toggle decoration path.
+ *
+ * Core behavior under test: legend hw toggles, precision toggles, and color
+ * changes restyle the existing SVG (opacity / fill / shape) WITHOUT tearing
+ * down and rebuilding the chart structure — the ~300ms main-thread long task
+ * behind the failing field INP. A rebuild is detected via a spy on
+ * setupChartStructure, which every full chart render must call.
+ */
+import { act, createElement, useReducer } from 'react';
+import { createRoot } from 'react-dom/client';
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
+import * as d3 from 'd3';
+
+import { setupChartStructure } from '@/lib/d3-chart/chart-setup';
+import type { ChartDefinition, InferenceData } from '@/components/inference/types';
+
+// ── Module mocks ───────────────────────────────────────────────────────────
+vi.mock('@/lib/d3-chart/chart-setup', { spy: true });
+vi.mock('@/lib/analytics', () => ({ track: vi.fn() }));
+vi.mock('next-themes', () => ({ useTheme: () => ({ resolvedTheme: 'dark' }) }));
+// The legend is React-rendered (covered elsewhere) — keep the tree light.
+vi.mock('@/components/ui/chart-legend', () => ({ default: () => null }));
+
+const inferenceState = vi.hoisted(() => ({ current: {} as Record<string, unknown> }));
+vi.mock('@/components/inference/InferenceContext', () => ({
+  useInference: () => inferenceState.current,
+}));
+
+const overlayState = vi.hoisted(() => ({ current: {} as Record<string, unknown> }));
+vi.mock('@/components/unofficial-run-provider', () => ({
+  useUnofficialRun: () => overlayState.current,
+}));
+
+import ScatterGraph from './ScatterGraph';
+
+// ── Environment stubs ────────────────────────────────────────────────────────
+class MockResizeObserver {
+  observe() {}
+  unobserve() {}
+  disconnect() {}
+}
+
+// ── Fixtures ─────────────────────────────────────────────────────────────────
+const point = (hwKey: string, precision: string, x: number, y: number, tp: number): InferenceData =>
+  ({ hwKey, precision, x, y, tp, conc: 16, framework: 'vllm' }) as unknown as InferenceData;
+
+// h100 owns both axis extremes so hiding b200 / showing fp4 keeps the niced
+// domains identical — exactly the toggle case that must not rebuild.
+const POINTS: InferenceData[] = [
+  point('h100', 'fp8', 1, 1, 1),
+  point('h100', 'fp8', 100, 1000, 8),
+  point('h100', 'fp4', 40, 400, 4),
+  point('b200', 'fp8', 50, 500, 4),
+  point('b200', 'fp8', 60, 600, 8),
+];
+
+const HARDWARE_CONFIG = {
+  h100: { name: 'H100', label: 'H100', gpu: 'H100' },
+  b200: { name: 'B200', label: 'B200', gpu: 'B200' },
+};
+
+const CHART_DEFINITION = { chartType: 'interactivity' } as unknown as ChartDefinition;
+
+const noop = () => {};
+
+function baseInferenceState() {
+  return {
+    activeHwTypes: new Set(['h100', 'b200']),
+    hardwareConfig: HARDWARE_CONFIG,
+    toggleHwType: noop,
+    removeHwType: noop,
+    hwTypesWithData: new Set(['h100', 'b200']),
+    selectedPrecisions: ['fp8'],
+    selectedYAxisMetric: 'y',
+    availableRuns: null,
+    selectedRunId: '',
+    hideNonOptimal: false,
+    setHideNonOptimal: noop,
+    hidePointLabels: false,
+    setHidePointLabels: noop,
+    selectAllHwTypes: noop,
+    highContrast: false,
+    setHighContrast: noop,
+    logScale: false,
+    setLogScale: noop,
+    scaleType: 'auto',
+    isLegendExpanded: false,
+    setIsLegendExpanded: noop,
+    useAdvancedLabels: false,
+    setUseAdvancedLabels: noop,
+    showGradientLabels: false,
+    setShowGradientLabels: noop,
+    showLineLabels: false,
+    setShowLineLabels: noop,
+    showSpeedOverlay: false,
+    setShowSpeedOverlay: noop,
+    showMinecraftOverlay: false,
+    setShowMinecraftOverlay: noop,
+    trackedConfigs: [],
+    addTrackedConfig: noop,
+    removeTrackedConfig: noop,
+  };
+}
+
+function baseOverlayState() {
+  return {
+    isUnofficialRun: false,
+    activeOverlayHwTypes: new Set<string>(),
+    setActiveOverlayHwTypes: noop,
+    allOverlayHwTypes: new Set<string>(),
+    toggleOverlayHwType: noop,
+    resetOverlayHwTypes: noop,
+    localOfficialOverride: null,
+    setLocalOfficialOverride: noop,
+    runIndexByUrl: {},
+    unofficialRunInfos: [],
+  };
+}
+
+// ── Harness ──────────────────────────────────────────────────────────────────
+function mountChart(props?: Partial<Parameters<typeof ScatterGraph>[0]>) {
+  let forceUpdate: () => void = noop;
+  function Harness() {
+    // ScatterGraph and D3Chart are React.memo'd; mocked context hooks bypass
+    // React's context subscription, so re-renders are driven through a
+    // version-bumped caption prop.
+    const [version, bump] = useReducer((v: number) => v + 1, 0);
+    forceUpdate = bump;
+    return createElement(ScatterGraph, {
+      chartId: 'chart-test',
+      modelLabel: 'DeepSeek-R1-0528',
+      data: POINTS,
+      xLabel: 'Interactivity (tok/s/user)',
+      yLabel: 'Output Throughput per GPU',
+      chartDefinition: CHART_DEFINITION,
+      transitionDuration: 0,
+      caption: `v${version}`,
+      ...props,
+    });
+  }
+
+  const container = document.createElement('div');
+  document.body.append(container);
+  const root = createRoot(container);
+  act(() => {
+    root.render(createElement(Harness));
+  });
+  return {
+    container,
+    rerender: () => act(() => forceUpdate()),
+    unmount: () => {
+      act(() => root.unmount());
+      container.remove();
+    },
+  };
+}
+
+const dotGroups = (container: HTMLElement, hwKey?: string) =>
+  [...container.querySelectorAll<SVGGElement>('.dot-group')].filter(
+    (n) => !hwKey || n.dataset.hwKey === hwKey,
+  );
+
+const rebuildCount = () => vi.mocked(setupChartStructure).mock.calls.length;
+
+beforeEach(() => {
+  vi.stubGlobal('ResizeObserver', MockResizeObserver);
+  // Charts measure their container; jsdom reports 0 — give them real space.
+  vi.spyOn(HTMLElement.prototype, 'getBoundingClientRect').mockReturnValue({
+    width: 800,
+    height: 600,
+    top: 0,
+    left: 0,
+    right: 800,
+    bottom: 600,
+    x: 0,
+    y: 0,
+    toJSON: () => ({}),
+  } as DOMRect);
+  inferenceState.current = baseInferenceState();
+  overlayState.current = baseOverlayState();
+  vi.mocked(setupChartStructure).mockClear();
+});
+
+afterEach(() => {
+  vi.unstubAllGlobals();
+  vi.restoreAllMocks();
+});
+
+describe('ScatterGraph toggle decoration', () => {
+  it('renders all points and rooflines after mount', () => {
+    const { container, unmount } = mountChart();
+
+    expect(dotGroups(container)).toHaveLength(POINTS.length);
+    expect(container.querySelectorAll('.roofline-path').length).toBeGreaterThan(0);
+    expect(rebuildCount()).toBeGreaterThan(0);
+    unmount();
+  });
+
+  it('hides a toggled-off hw via opacity without rebuilding the chart', () => {
+    const { container, rerender, unmount } = mountChart();
+    const buildsAfterMount = rebuildCount();
+
+    inferenceState.current = {
+      ...inferenceState.current,
+      activeHwTypes: new Set(['h100']),
+    };
+    rerender();
+
+    for (const dot of dotGroups(container, 'b200')) {
+      expect(dot.style.opacity).toBe('0');
+      expect(dot.style.pointerEvents).toBe('none');
+    }
+    for (const dot of dotGroups(container, 'h100').filter((d) => d.dataset.precision === 'fp8')) {
+      expect(dot.style.opacity).toBe('1');
+      expect(dot.style.pointerEvents).toBe('auto');
+    }
+    const b200Roofline = container.querySelector<SVGPathElement>(
+      '.roofline-path[data-hw-key="b200"]',
+    );
+    expect(b200Roofline).not.toBeNull();
+    expect(b200Roofline!.style.opacity).toBe('0');
+
+    // The whole point: a legend toggle is a restyle, not a teardown/rebuild.
+    expect(rebuildCount()).toBe(buildsAfterMount);
+    unmount();
+  });
+
+  it('recolors remaining series when the active set changes, without rebuilding', () => {
+    const { container, rerender, unmount } = mountChart();
+    const buildsAfterMount = rebuildCount();
+    const h100Fill = () =>
+      dotGroups(container, 'h100')[0].querySelector('.visible-shape')!.getAttribute('fill');
+    const before = h100Fill();
+
+    // h100 and b200 share the NVIDIA hue zone: dropping one redistributes
+    // the remaining hues (dynamic-colors), so the dots must actually recolor.
+    inferenceState.current = {
+      ...inferenceState.current,
+      activeHwTypes: new Set(['h100']),
+    };
+    rerender();
+
+    expect(h100Fill()).not.toBe(before);
+    expect(rebuildCount()).toBe(buildsAfterMount);
+    unmount();
+  });
+
+  it('swaps point shapes when a second precision is selected, without rebuilding', () => {
+    const { container, rerender, unmount } = mountChart();
+    const buildsAfterMount = rebuildCount();
+    const fp4Dot = () => dotGroups(container, 'h100').find((d) => d.dataset.precision === 'fp4')!;
+
+    // Single precision: fp4 points are hidden circles.
+    expect(fp4Dot().style.opacity).toBe('0');
+    expect(fp4Dot().querySelector('.visible-shape')!.tagName.toLowerCase()).toBe('circle');
+
+    inferenceState.current = {
+      ...inferenceState.current,
+      selectedPrecisions: ['fp8', 'fp4'],
+    };
+    rerender();
+
+    // Second precision becomes visible as the square shape (slot 2).
+    expect(fp4Dot().style.opacity).toBe('1');
+    const shape = fp4Dot().querySelector<SVGElement>('.visible-shape')!;
+    expect(shape.tagName.toLowerCase()).toBe('rect');
+    expect(shape.dataset.shapeKey).toBe('square');
+    expect(rebuildCount()).toBe(buildsAfterMount);
+    unmount();
+  });
+
+  it('rebuilds when the scale domain actually changes (data refresh path intact)', () => {
+    const { rerender, unmount } = mountChart();
+    const buildsAfterMount = rebuildCount();
+
+    // Hiding the hw that owns the axis extremes changes the visible domain —
+    // axes must rescale, which is a legitimate full render.
+    inferenceState.current = {
+      ...inferenceState.current,
+      activeHwTypes: new Set(['b200']),
+    };
+    rerender();
+
+    expect(rebuildCount()).toBeGreaterThan(buildsAfterMount);
+    unmount();
+  });
+
+  it('animates rooflines together with dots on a domain-changing toggle', () => {
+    // Real transition duration: the rebuild restores each surviving element to
+    // its old position/path and schedules a "data-update" transition that only
+    // starts on the next timer tick. Regression: the decoration effect used to
+    // re-apply final roofline `d` attrs in the same commit, so the curve
+    // teleported to its destination while the dots animated.
+    const { container, rerender, unmount } = mountChart({ transitionDuration: 750 });
+
+    const b200Roofline = () =>
+      container.querySelector<SVGPathElement>('.roofline-path[data-hw-key="b200"]')!;
+    const b200Dot = () => dotGroups(container, 'b200')[0];
+    const dBefore = b200Roofline().getAttribute('d');
+    const dotTransformBefore = b200Dot().getAttribute('transform');
+    expect(dBefore).toBeTruthy();
+
+    // Hide the extreme-owning hw → domains shrink → full render + animation.
+    inferenceState.current = {
+      ...inferenceState.current,
+      activeHwTypes: new Set(['b200']),
+    };
+    rerender();
+
+    // At commit end the transitions are scheduled but have not ticked: both
+    // the roofline path and the dots must still sit at their OLD coordinates,
+    // each with a pending transition toward the new ones.
+    expect(b200Roofline().getAttribute('d')).toBe(dBefore);
+    expect(b200Dot().getAttribute('transform')).toBe(dotTransformBefore);
+    expect((b200Roofline() as unknown as { __transition?: object }).__transition).toBeTruthy();
+    expect((b200Dot() as unknown as { __transition?: object }).__transition).toBeTruthy();
+
+    // jsdom can't run the SVG transform interpolator (no transform.baseVal),
+    // so cancel the scheduled transitions before teardown.
+    d3.select(container).selectAll('.dot-group, .roofline-path').interrupt('data-update');
+    unmount();
+  });
+
+  it('keeps unofficial-run overlay markers rendered through official toggles', () => {
+    const overlayPoints = [point('h100', 'fp8', 30, 300, 2), point('h100', 'fp8', 35, 350, 4)].map(
+      (p) => ({ ...p, run_url: 'https://github.com/o/r/actions/runs/123' }),
+    );
+    overlayState.current = {
+      ...baseOverlayState(),
+      isUnofficialRun: true,
+      activeOverlayHwTypes: new Set(['h100']),
+      allOverlayHwTypes: new Set(['h100']),
+      runIndexByUrl: { 'https://github.com/o/r/actions/runs/123': 0 },
+      unofficialRunInfos: [
+        { id: '123', branch: 'test-branch', url: 'https://github.com/o/r/actions/runs/123' },
+      ],
+    };
+    const { container, rerender, unmount } = mountChart({
+      overlayData: {
+        data: overlayPoints,
+        hardwareConfig: HARDWARE_CONFIG,
+      } as unknown as Parameters<typeof ScatterGraph>[0]['overlayData'],
+    });
+    const buildsAfterMount = rebuildCount();
+
+    expect(container.querySelectorAll('.unofficial-overlay-pt')).toHaveLength(2);
+    expect(container.querySelectorAll('.overlay-roofline-path').length).toBeGreaterThan(0);
+
+    // Toggling an official hw must not rebuild or disturb overlay markers.
+    inferenceState.current = {
+      ...inferenceState.current,
+      activeHwTypes: new Set(['h100']),
+    };
+    rerender();
+
+    expect(container.querySelectorAll('.unofficial-overlay-pt')).toHaveLength(2);
+    expect(rebuildCount()).toBe(buildsAfterMount);
+    unmount();
+  });
+});