Share copied test fixtures through src/testSupport

Environment overrides, manual timers, a cancellable streaming response,
GhostMaps KML/KMZ fixtures and the satellite service doubles move into
five shared helpers; 21 tests drop 418 lines of copies.

src/data/cctvCalgary.test.mjs

@@ -1,3 +1,4 @@
+import { streamingResponse } from '../testSupport/streamingResponse.mjs';
 import { test } from 'node:test';
 import assert from 'node:assert/strict';
 
@@ -19,24 +20,6 @@ import { allocateSourceCap } from '../../server/providers/cctv/cap.js';
 import { createCctvCatalog } from '../../server/providers/cctv/catalog.js';
 import { directionToHeading } from './directionText.js';
 
-/**
- * A response whose body is a live stream, plus a flag that flips when the
- * stream is cancelled. A rejection path that returns without cancelling holds
- * the transport open, so the flag is what the refusal tests actually assert.
- */
-const streamingResponse = (init = {}) => {
-  const state = { cancelled: false };
-  const body = new ReadableStream({
-    start(controller) {
-      controller.enqueue(new TextEncoder().encode('['));
-    },
-    cancel() {
-      state.cancelled = true;
-    },
-  });
-  return { response: new Response(body, init), state };
-};
-
 /** One Open Calgary row, shaped like the live `k7p9-kppz` payload. */
 const row = (overrides = {}) => ({
   camera_url: {

src/data/cctvCataloniaSource.test.mjs

@@ -1,3 +1,4 @@
+import { withEnv } from '../testSupport/environment.mjs';
 import { test } from 'node:test';
 import assert from 'node:assert/strict';
 import fs from 'node:fs';
@@ -17,17 +18,6 @@ import {
 } from '../../server/providers/cctv/sources.js';
 
 /** Set (or, for `undefined`, delete) environment variables for one test. */
-function withEnv(t, env) {
-  for (const [name, value] of Object.entries(env)) {
-    const previous = process.env[name];
-    t.after(() => {
-      if (previous === undefined) delete process.env[name];
-      else process.env[name] = previous;
-    });
-    if (value === undefined) delete process.env[name];
-    else process.env[name] = value;
-  }
-}
 
 /** Silence the loaders' progress and failure logging. */
 function quiet(t) {

src/data/cctvDriveBcSource.test.mjs

@@ -1,3 +1,4 @@
+import { withEnv } from '../testSupport/environment.mjs';
 import { test } from 'node:test';
 import assert from 'node:assert/strict';
 import fs from 'node:fs';
@@ -28,17 +29,6 @@ import {
 } from '../../server/providers/cctv/sources.js';
 
 /** Set (or, for `undefined`, delete) environment variables for one test. */
-function withEnv(t, env) {
-  for (const [name, value] of Object.entries(env)) {
-    const previous = process.env[name];
-    t.after(() => {
-      if (previous === undefined) delete process.env[name];
-      else process.env[name] = previous;
-    });
-    if (value === undefined) delete process.env[name];
-    else process.env[name] = value;
-  }
-}
 
 /** Silence the loaders' progress and failure logging. */
 function quiet(t) {

src/data/cctvIceland.test.mjs

@@ -1,3 +1,4 @@
+import { withEnv } from '../testSupport/environment.mjs';
 import { test } from 'node:test';
 import assert from 'node:assert/strict';
 import fs from 'node:fs';
@@ -19,17 +20,6 @@ import {
 } from '../../server/providers/cctv/sources.js';
 
 /** Set (or, for `undefined`, delete) environment variables for one test. */
-function withEnv(t, env) {
-  for (const [name, value] of Object.entries(env)) {
-    const previous = process.env[name];
-    t.after(() => {
-      if (previous === undefined) delete process.env[name];
-      else process.env[name] = previous;
-    });
-    if (value === undefined) delete process.env[name];
-    else process.env[name] = value;
-  }
-}
 
 /** One row shaped like the live `vefmyndavelar2014_1` payload. */
 const row = (over = {}) => ({

src/data/cctvKingCountySource.test.mjs

@@ -1,3 +1,4 @@
+import { withEnv } from '../testSupport/environment.mjs';
 import { test } from 'node:test';
 import assert from 'node:assert/strict';
 import { mkdtempSync, rmSync } from 'node:fs';
@@ -14,17 +15,6 @@ import { cctvProxy } from '../../server/providers/cctv.js';
 import { createCatalog } from '../layers/cctv/catalog.js';
 
 /** Set (or, for `undefined`, delete) environment variables for one test. */
-function withEnv(t, env) {
-  for (const [name, value] of Object.entries(env)) {
-    const previous = process.env[name];
-    t.after(() => {
-      if (previous === undefined) delete process.env[name];
-      else process.env[name] = previous;
-    });
-    if (value === undefined) delete process.env[name];
-    else process.env[name] = value;
-  }
-}
 
 /** Silence the loaders' progress and failure logging. */
 function quiet(t) {

src/data/cctvMissingNumbers.test.mjs

@@ -1,3 +1,4 @@
+import { withEnv } from '../testSupport/environment.mjs';
 import { test } from 'node:test';
 import assert from 'node:assert/strict';
 import { mkdtempSync, rmSync, writeFileSync } from 'node:fs';
@@ -22,17 +23,6 @@ import { createModel } from '../layers/cctv/model.js';
 const ABSENT = [null, undefined, '', ' ', false, true];
 
 /** Set env vars for one test and restore them afterwards. */
-function withEnv(t, env) {
-  for (const [name, value] of Object.entries(env)) {
-    const previous = process.env[name];
-    t.after(() => {
-      if (previous === undefined) delete process.env[name];
-      else process.env[name] = previous;
-    });
-    if (value === undefined) delete process.env[name];
-    else process.env[name] = value;
-  }
-}
 
 /** Silence the loaders' progress and failure logging. */
 function quiet(t) {

src/data/cctvNyc.test.mjs

@@ -1,3 +1,4 @@
+import { streamingResponse } from '../testSupport/streamingResponse.mjs';
 import { test } from 'node:test';
 import assert from 'node:assert/strict';
 
@@ -22,24 +23,6 @@ import {
 } from '../../server/providers/cctv/normalize.js';
 import { createCctvCatalog } from '../../server/providers/cctv/catalog.js';
 
-/**
- * A response whose body is a live stream, plus a flag that flips when the
- * stream is cancelled. A rejection path that returns without cancelling holds
- * the transport open, so the flag is what the refusal tests actually assert.
- */
-const streamingResponse = (init = {}) => {
-  const state = { cancelled: false };
-  const body = new ReadableStream({
-    start(controller) {
-      controller.enqueue(new TextEncoder().encode('['));
-    },
-    cancel() {
-      state.cancelled = true;
-    },
-  });
-  return { response: new Response(body, init), state };
-};
-
 const MIDTOWN_ID = '8a6bc417-4877-4ebe-8052-88c1b261baf1';
 const BROOKLYN_ID = '11111111-2222-3333-4444-555555555555';
 

src/data/cctvOttawa.test.mjs

@@ -1,3 +1,4 @@
+import { withEnv } from '../testSupport/environment.mjs';
 import { test } from 'node:test';
 import assert from 'node:assert/strict';
 import fs from 'node:fs';
@@ -21,17 +22,6 @@ import {
 const CERT = { OTTAWA_CAMERA_CERTIFICATE: 'CERT123' };
 
 /** Set (or, for `undefined`, delete) environment variables for one test. */
-function withEnv(t, env) {
-  for (const [name, value] of Object.entries(env)) {
-    const previous = process.env[name];
-    t.after(() => {
-      if (previous === undefined) delete process.env[name];
-      else process.env[name] = previous;
-    });
-    if (value === undefined) delete process.env[name];
-    else process.env[name] = value;
-  }
-}
 
 /** Silence the loader's progress and failure logging. */
 function quiet(t) {

src/data/cctvWorldQuebec.test.mjs

@@ -1,3 +1,4 @@
+import { withEnv } from '../testSupport/environment.mjs';
 import { test } from 'node:test';
 import assert from 'node:assert/strict';
 import fs from 'node:fs';
@@ -29,17 +30,6 @@ function quiet(t) {
 }
 
 /** Set (or, for `undefined`, delete) environment variables for one test. */
-function withEnv(t, env) {
-  for (const [name, value] of Object.entries(env)) {
-    const previous = process.env[name];
-    t.after(() => {
-      if (previous === undefined) delete process.env[name];
-      else process.env[name] = previous;
-    });
-    if (value === undefined) delete process.env[name];
-    else process.env[name] = value;
-  }
-}
 
 /** A temporary source root holding the given World and Québec catalogs. */
 function sourceRoot(t, { world = [], quebec = null } = {}) {

src/data/cctvWsdotSource.test.mjs

@@ -1,3 +1,4 @@
+import { withEnv } from '../testSupport/environment.mjs';
 import { test } from 'node:test';
 import assert from 'node:assert/strict';
 import fs from 'node:fs';
@@ -15,17 +16,6 @@ import {
 } from '../../server/providers/cctv/sources.js';
 
 /** Set (or, for `undefined`, delete) environment variables for one test. */
-function withEnv(t, env) {
-  for (const [name, value] of Object.entries(env)) {
-    const previous = process.env[name];
-    t.after(() => {
-      if (previous === undefined) delete process.env[name];
-      else process.env[name] = previous;
-    });
-    if (value === undefined) delete process.env[name];
-    else process.env[name] = value;
-  }
-}
 
 /** Silence the loaders' progress and failure logging. */
 function quiet(t) {

src/hudAltitudeDatum.test.mjs

@@ -1,3 +1,4 @@
+import './testSupport/stubMgrs.mjs';
 // The HUD's ALT readout datum. Field report (2026-08-22, cockpit parked at
 // SFO): the bottom-right OSD read "ALT: -15M" — and JFK, earlier, "ALT: -18M".
 // Cesium reports the camera's height against the WGS84 ELLIPSOID, and San
@@ -25,27 +26,8 @@ import { createFakeEngine } from './globe/testing/fakeEngine.js';
 import assert from 'node:assert/strict';
 import { hudReadouts } from './testSupport/hudReadouts.mjs';
 import { readFileSync } from 'node:fs';
-import { registerHooks } from 'node:module';
 import { ensureGeoidReady } from './data/geoid.js';
 
-const MGRS_STUB_URL = 'gev-test-stub:mgrs';
-registerHooks({
-  resolve(specifier, context, next) {
-    if (specifier === 'mgrs') return { url: MGRS_STUB_URL, shortCircuit: true };
-    return next(specifier, context);
-  },
-  load(url, context, next) {
-    if (url === MGRS_STUB_URL) {
-      return {
-        format: 'module',
-        shortCircuit: true,
-        source:
-          'export function forward() { return "10SEG55776339"; }\nexport default { forward };\n',
-      };
-    }
-    return next(url, context);
-  },
-});
 
 const { IntelHUD } = await import('./hud.js');
 

src/hudDms.test.mjs

@@ -1,3 +1,4 @@
+import './testSupport/stubMgrs.mjs';
 import { viewerEngine } from './testSupport/viewerEngine.mjs';
 // The HUD's LAT/LON readout in degrees-minutes-seconds. Seconds are printed to
 // two decimals, so a value within 0.005" of the next whole minute rounds up.
@@ -11,26 +12,6 @@ import { viewerEngine } from './testSupport/viewerEngine.mjs';
 import { test } from 'node:test';
 import assert from 'node:assert/strict';
 import { hudReadouts } from './testSupport/hudReadouts.mjs';
-import { registerHooks } from 'node:module';
-
-const MGRS_STUB_URL = 'gev-test-stub:mgrs';
-registerHooks({
-  resolve(specifier, context, next) {
-    if (specifier === 'mgrs') return { url: MGRS_STUB_URL, shortCircuit: true };
-    return next(specifier, context);
-  },
-  load(url, context, next) {
-    if (url === MGRS_STUB_URL) {
-      return {
-        format: 'module',
-        shortCircuit: true,
-        source:
-          'export function forward() { return "10SEG55776339"; }\nexport default { forward };\n',
-      };
-    }
-    return next(url, context);
-  },
-});
 
 const { IntelHUD } = await import('./hud.js');
 

src/hudPageVisibility.test.mjs

@@ -1,3 +1,4 @@
+import './testSupport/stubMgrs.mjs';
 import { viewerEngine } from './testSupport/viewerEngine.mjs';
 // The HUD's 250 ms telemetry readout skips ticks in a hidden page, except in
 // an inline panel, whose host may report it hidden while it is on screen.
@@ -8,25 +9,7 @@ import { viewerEngine } from './testSupport/viewerEngine.mjs';
 import { test } from 'node:test';
 import assert from 'node:assert/strict';
 import { hudReadouts } from './testSupport/hudReadouts.mjs';
-import { registerHooks } from 'node:module';
 
-const MGRS_STUB_URL = 'gev-test-stub:mgrs';
-registerHooks({
-  resolve(specifier, context, next) {
-    if (specifier === 'mgrs') return { url: MGRS_STUB_URL, shortCircuit: true };
-    return next(specifier, context);
-  },
-  load(url, context, next) {
-    if (url === MGRS_STUB_URL) {
-      return {
-        format: 'module',
-        shortCircuit: true,
-        source: 'export function forward() { return "10SEG55776339"; }\nexport default { forward };\n',
-      };
-    }
-    return next(url, context);
-  },
-});
 
 const { IntelHUD } = await import('./hud.js');
 

src/hudSummaryGate.test.mjs

@@ -1,3 +1,4 @@
+import './testSupport/stubMgrs.mjs';
 import { viewerEngine } from './testSupport/viewerEngine.mjs';
 // The HUD's place lookups are paid Google requests made only to feed the AI
 // summary, so a server without one must not be asked to make them.
@@ -8,26 +9,6 @@ import { viewerEngine } from './testSupport/viewerEngine.mjs';
 import { test } from 'node:test';
 import assert from 'node:assert/strict';
 import { hudReadouts } from './testSupport/hudReadouts.mjs';
-import { registerHooks } from 'node:module';
-
-const MGRS_STUB_URL = 'gev-test-stub:mgrs';
-registerHooks({
-  resolve(specifier, context, next) {
-    if (specifier === 'mgrs') return { url: MGRS_STUB_URL, shortCircuit: true };
-    return next(specifier, context);
-  },
-  load(url, context, next) {
-    if (url === MGRS_STUB_URL) {
-      return {
-        format: 'module',
-        shortCircuit: true,
-        source:
-          'export function forward() { return "10SEG55776339"; }\nexport default { forward };\n',
-      };
-    }
-    return next(url, context);
-  },
-});
 
 const { IntelHUD } = await import('./hud.js');
 

src/layers/ghostMaps/edgeCases.test.mjs

@@ -1,3 +1,8 @@
+import {
+  element,
+  kmz,
+  deferred,
+} from '../../testSupport/ghostMapsFixtures.mjs';
 // Edge cases for s2-ghostmaps:
 // change the KMZ edition and the engine before parsing finishes; only the
 // selected edition is shown, and a bad archive does not erase the working one.
@@ -5,25 +10,6 @@ import assert from 'node:assert/strict';
 import test from 'node:test';
 import { createGhostMapsLayer } from './index.js';
 
-function element(localName, children = [], value = '') {
-  const node = {
-    localName,
-    children,
-    get textContent() {
-      return value + children.map((child) => child.textContent).join('');
-    },
-    getAttribute: () => null,
-    getElementsByTagName(name) {
-      return children.flatMap((child) => [
-        ...(name === '*' || name === child.localName ? [child] : []),
-        ...child.getElementsByTagName(name),
-      ]);
-    },
-  };
-  for (const child of children) child.parentElement = node;
-  return node;
-}
-
 // The XML double turns `<kml>NAME</kml>` into one placemark called NAME.
 function documentFor(xml) {
   const name = /<kml>(.*)<\/kml>/.exec(xml)?.[1] ?? 'unnamed';
@@ -39,37 +25,6 @@ function documentFor(xml) {
   ]);
 }
 
-/** A stored (uncompressed) KMZ holding doc.kml only. */
-function kmz(name) {
-  const key = Buffer.from('doc.kml');
-  const bytes = Buffer.from(`<kml>${name}</kml>`);
-  const header = Buffer.alloc(30);
-  header.writeUInt32LE(0x04034b50);
-  header.writeUInt32LE(bytes.length, 18);
-  header.writeUInt32LE(bytes.length, 22);
-  header.writeUInt16LE(key.length, 26);
-  const directory = Buffer.alloc(46);
-  directory.writeUInt32LE(0x02014b50);
-  directory.writeUInt32LE(bytes.length, 20);
-  directory.writeUInt32LE(bytes.length, 24);
-  directory.writeUInt16LE(key.length, 28);
-  directory.writeUInt32LE(0, 42);
-  const central = Buffer.concat([directory, key]);
-  const end = Buffer.alloc(22);
-  end.writeUInt32LE(0x06054b50);
-  end.writeUInt16LE(1, 8);
-  end.writeUInt16LE(1, 10);
-  end.writeUInt32LE(central.length, 12);
-  end.writeUInt32LE(header.length + key.length + bytes.length, 16);
-  return new Uint8Array(Buffer.concat([header, key, bytes, central, end]));
-}
-
-function deferred() {
-  let resolve;
-  const promise = new Promise((done) => (resolve = done));
-  return { promise, resolve };
-}
-
 const catalog = (version) => ({
   products: [{ id: 'cip', version, defaultOn: true }],
 });

src/layers/ghostMaps/pendingPaint.test.mjs

@@ -1,26 +1,12 @@
+import {
+  element,
+  kmz,
+  deferred,
+} from '../../testSupport/ghostMapsFixtures.mjs';
 import assert from 'node:assert/strict';
 import test from 'node:test';
 import { createGhostMapsLayer } from './index.js';
 
-function element(localName, children = [], value = '') {
-  const node = {
-    localName,
-    children,
-    get textContent() {
-      return value + children.map((child) => child.textContent).join('');
-    },
-    getAttribute: () => null,
-    getElementsByTagName(name) {
-      return children.flatMap((child) => [
-        ...(name === '*' || name === child.localName ? [child] : []),
-        ...child.getElementsByTagName(name),
-      ]);
-    },
-  };
-  for (const child of children) child.parentElement = node;
-  return node;
-}
-
 // The XML double turns `<kml>NAME</kml>` into one placemark called NAME.
 function documentFor(xml) {
   const name = /<kml>(.*)<\/kml>/.exec(xml)?.[1] ?? 'unnamed';
@@ -41,37 +27,6 @@ function documentFor(xml) {
   ]);
 }
 
-/** A stored (uncompressed) KMZ holding doc.kml only. */
-function kmz(name) {
-  const key = Buffer.from('doc.kml');
-  const bytes = Buffer.from(`<kml>${name}</kml>`);
-  const header = Buffer.alloc(30);
-  header.writeUInt32LE(0x04034b50);
-  header.writeUInt32LE(bytes.length, 18);
-  header.writeUInt32LE(bytes.length, 22);
-  header.writeUInt16LE(key.length, 26);
-  const directory = Buffer.alloc(46);
-  directory.writeUInt32LE(0x02014b50);
-  directory.writeUInt32LE(bytes.length, 20);
-  directory.writeUInt32LE(bytes.length, 24);
-  directory.writeUInt16LE(key.length, 28);
-  directory.writeUInt32LE(0, 42);
-  const central = Buffer.concat([directory, key]);
-  const end = Buffer.alloc(22);
-  end.writeUInt32LE(0x06054b50);
-  end.writeUInt16LE(1, 8);
-  end.writeUInt16LE(1, 10);
-  end.writeUInt32LE(central.length, 12);
-  end.writeUInt32LE(header.length + key.length + bytes.length, 16);
-  return new Uint8Array(Buffer.concat([header, key, bytes, central, end]));
-}
-
-function deferred() {
-  let resolve;
-  const promise = new Promise((done) => (resolve = done));
-  return { promise, resolve };
-}
-
 const catalog = (version) => ({
   products: [{ id: 'cip', version, defaultOn: true }],
 });

src/layers/satellites/cockpitSubject.test.mjs

@@ -2,7 +2,7 @@ import assert from 'node:assert/strict';
 import test from 'node:test';
 import * as geo from '../../geo/index.js';
 import { createFakeEngine } from '../../globe/testing/fakeEngine.js';
-import { createSatellitesDisplay } from './render/display.js';
+import { satelliteServices } from '../../testSupport/satelliteServices.mjs';
 import { constantRgba } from '../shared/color.js';
 import { createState } from './state.js';
 import { createControls } from './controls.js';
@@ -98,31 +98,9 @@ async function fixture(t) {
     readSensors: async () => SENSORS,
   };
   const noop = () => {};
-  const services = {
-    renderer: { create: ({ engine }) => createSatellitesDisplay(engine) },
-    overlays: {
-      setEntries: noop,
-      setVisible: noop,
-      clearSource: noop,
-    },
-    layerState: { isExplicitLayerStateOrigin: () => false },
-    focus: {
-      clearFocusTarget: noop,
-      publishFocusTargetFromCachedPosition: noop,
-      getFocusTarget: () => null,
-      focusNowMs: (now) => now,
-      focusPassIsNeeded: () => false,
-    },
-    context: {
-      clearTrackedSubjectContext: noop,
-      getContextStore: () => ({ entities: new Map() }),
-      refreshTrackedSubjectContext: noop,
-      selectTrackedSubjectContext: noop,
-    },
-    readout: { refreshTrackedReadout: noop },
-    render: { holdContinuousRender: noop, releaseContinuousRender: noop },
-    picking: { registerPickOwner: noop, unregisterPickOwner: noop },
-  };
+  const services = satelliteServices();
+  services.focus.focusNowMs = (now) => now;
+  services.focus.focusPassIsNeeded = () => false;
   const previousDocument = globalThis.document;
   globalThis.document = new EventTarget();
   const state = createState({ services });

src/layers/satellites/stale.test.mjs

@@ -1,4 +1,4 @@
-import { createSatellitesDisplay } from './render/display.js';
+import { satelliteServices } from '../../testSupport/satelliteServices.mjs';
 import assert from 'node:assert/strict';
 import http from 'node:http';
 import { EventEmitter, once } from 'node:events';
@@ -76,32 +76,7 @@ async function fixture(t) {
   // Application host services and native EventTargets; the display on the
   // fake engine, its input, events, SGP4, ingestion and lifecycle run without
   // a WebGL scene.
-  const noop = () => {};
-  const services = {
-    renderer: {
-      create: ({ engine }) => createSatellitesDisplay(engine),
-    },
-    overlays: {
-      setEntries: noop,
-      setVisible: noop,
-      clearSource: noop,
-    },
-    layerState: { isExplicitLayerStateOrigin: () => false },
-    focus: {
-      clearFocusTarget: noop,
-      publishFocusTargetFromCachedPosition: noop,
-      getFocusTarget: () => null,
-    },
-    context: {
-      clearTrackedSubjectContext: noop,
-      getContextStore: () => ({ entities: new Map() }),
-      refreshTrackedSubjectContext: noop,
-      selectTrackedSubjectContext: noop,
-    },
-    readout: { refreshTrackedReadout: noop },
-    render: { holdContinuousRender: noop, releaseContinuousRender: noop },
-    picking: { registerPickOwner: noop, unregisterPickOwner: noop },
-  };
+  const services = satelliteServices();
   const previousDocument = globalThis.document;
   globalThis.document = new EventTarget();
   const state = createState({ services });

src/sharelink.navigation.test.mjs

@@ -1,3 +1,4 @@
+import { installManualTimers } from './testSupport/manualTimers.mjs';
 import { viewerEngine } from './testSupport/viewerEngine.mjs';
 import { test } from 'node:test';
 import assert from 'node:assert/strict';
@@ -72,23 +73,6 @@ function installTab(t, initialHash = '') {
   };
 }
 
-/** Queue timers instead of running them, so delayed work runs only on demand. */
-function installManualTimers(t) {
-  const prior = {
-    setTimeout: globalThis.setTimeout,
-    clearTimeout: globalThis.clearTimeout,
-  };
-  const timers = new Map();
-  let timerId = 0;
-  globalThis.setTimeout = (fn) => {
-    timers.set(++timerId, fn);
-    return timerId;
-  };
-  globalThis.clearTimeout = (id) => timers.delete(id);
-  t.after(() => Object.assign(globalThis, prior));
-  return timers;
-}
-
 function fakeViewer() {
   return viewerEngine({
     camera: {
@@ -175,7 +159,7 @@ test('a non-share hash is ignored and Back/Forward restores each entry once', (t
 
 test('a newer navigation supersedes an older restore and its pending write', (t) => {
   const tab = installTab(t, SHARE_A);
-  const timers = installManualTimers(t);
+  const timers = installManualTimers(t).timers;
 
   const manager = new ShareLinkManager(fakeViewer());
   manager.completeInitialRestore(manager.parseInitialHash().restoreToken);
@@ -237,7 +221,7 @@ function deferred() {
 /** A ShareRestoration over a real ShareLinkManager with a stub restore sink. */
 function restorationHarness(t, initialHash, navigationOverrides = {}) {
   const tab = installTab(t, initialHash);
-  const timers = installManualTimers(t);
+  const timers = installManualTimers(t).timers;
 
   const restores = [];
   let navigationGeneration = 0;
@@ -427,7 +411,7 @@ test('the layer coordinator replaces in-flight share layers with the navigated s
 
 test('a manager held for an engine-changing visit neither stamps nor restores that entry', (t) => {
   const tab = installTab(t, SHARE_A);
-  const timers = installManualTimers(t);
+  const timers = installManualTimers(t).timers;
   const manager = new ShareLinkManager(fakeViewer());
   manager.completeInitialRestore(manager.parseInitialHash().restoreToken);
   // The page's own popstate listener runs first (src/main.js): the visit

src/testSupport/environment.mjs

@@ -0,0 +1,11 @@
+export function withEnv(t, env) {
+  for (const [name, value] of Object.entries(env)) {
+    const previous = process.env[name];
+    t.after(() => {
+      if (previous === undefined) delete process.env[name];
+      else process.env[name] = previous;
+    });
+    if (value === undefined) delete process.env[name];
+    else process.env[name] = value;
+  }
+}

src/testSupport/ghostMapsFixtures.mjs

@@ -0,0 +1,49 @@
+export function element(localName, children = [], value = '') {
+  const node = {
+    localName,
+    children,
+    get textContent() {
+      return value + children.map((child) => child.textContent).join('');
+    },
+    getAttribute: () => null,
+    getElementsByTagName(name) {
+      return children.flatMap((child) => [
+        ...(name === '*' || name === child.localName ? [child] : []),
+        ...child.getElementsByTagName(name),
+      ]);
+    },
+  };
+  for (const child of children) child.parentElement = node;
+  return node;
+}
+
+/** A stored (uncompressed) KMZ holding doc.kml only. */
+export function kmz(name) {
+  const key = Buffer.from('doc.kml');
+  const bytes = Buffer.from(`<kml>${name}</kml>`);
+  const header = Buffer.alloc(30);
+  header.writeUInt32LE(0x04034b50);
+  header.writeUInt32LE(bytes.length, 18);
+  header.writeUInt32LE(bytes.length, 22);
+  header.writeUInt16LE(key.length, 26);
+  const directory = Buffer.alloc(46);
+  directory.writeUInt32LE(0x02014b50);
+  directory.writeUInt32LE(bytes.length, 20);
+  directory.writeUInt32LE(bytes.length, 24);
+  directory.writeUInt16LE(key.length, 28);
+  directory.writeUInt32LE(0, 42);
+  const central = Buffer.concat([directory, key]);
+  const end = Buffer.alloc(22);
+  end.writeUInt32LE(0x06054b50);
+  end.writeUInt16LE(1, 8);
+  end.writeUInt16LE(1, 10);
+  end.writeUInt32LE(central.length, 12);
+  end.writeUInt32LE(header.length + key.length + bytes.length, 16);
+  return new Uint8Array(Buffer.concat([header, key, bytes, central, end]));
+}
+
+export function deferred() {
+  let resolve;
+  const promise = new Promise((done) => (resolve = done));
+  return { promise, resolve };
+}

src/testSupport/manualTimers.mjs

@@ -0,0 +1,24 @@
+/** Queue timers instead of running them, so delayed work runs only on demand. */
+export function installManualTimers(t) {
+  const prior = {
+    setTimeout: globalThis.setTimeout,
+    clearTimeout: globalThis.clearTimeout,
+  };
+  const timers = new Map();
+  let timerId = 0;
+  globalThis.setTimeout = (fn) => {
+    timers.set(++timerId, fn);
+    return timerId;
+  };
+  globalThis.clearTimeout = (id) => timers.delete(id);
+  t.after(() => Object.assign(globalThis, prior));
+  return {
+    timers,
+    runAll() {
+      for (const [id, fn] of [...timers]) {
+        timers.delete(id);
+        fn();
+      }
+    },
+  };
+}

src/testSupport/satelliteServices.mjs

@@ -0,0 +1,30 @@
+import { createSatellitesDisplay } from '../layers/satellites/render/display.js';
+
+export function satelliteServices() {
+  const noop = () => {};
+  return {
+    renderer: {
+      create: ({ engine }) => createSatellitesDisplay(engine),
+    },
+    overlays: {
+      setEntries: noop,
+      setVisible: noop,
+      clearSource: noop,
+    },
+    layerState: { isExplicitLayerStateOrigin: () => false },
+    focus: {
+      clearFocusTarget: noop,
+      publishFocusTargetFromCachedPosition: noop,
+      getFocusTarget: () => null,
+    },
+    context: {
+      clearTrackedSubjectContext: noop,
+      getContextStore: () => ({ entities: new Map() }),
+      refreshTrackedSubjectContext: noop,
+      selectTrackedSubjectContext: noop,
+    },
+    readout: { refreshTrackedReadout: noop },
+    render: { holdContinuousRender: noop, releaseContinuousRender: noop },
+    picking: { registerPickOwner: noop, unregisterPickOwner: noop },
+  };
+}

src/testSupport/streamingResponse.mjs

@@ -0,0 +1,17 @@
+/**
+ * A response whose body is a live stream, plus a flag that flips when the
+ * stream is cancelled. A rejection path that returns without cancelling holds
+ * the transport open, so the flag is what the refusal tests actually assert.
+ */
+export const streamingResponse = (init = {}) => {
+  const state = { cancelled: false };
+  const body = new ReadableStream({
+    start(controller) {
+      controller.enqueue(new TextEncoder().encode('['));
+    },
+    cancel() {
+      state.cancelled = true;
+    },
+  });
+  return { response: new Response(body, init), state };
+};

src/ui/shareLinks.test.mjs

@@ -1,3 +1,4 @@
+import { installManualTimers } from '../testSupport/manualTimers.mjs';
 import { createFakeEngine } from '../globe/testing/fakeEngine.js';
 import { createCesiumMoversEngine } from '../testSupport/cesiumMoversEngine.mjs';
 import { enuOffset } from '../globe/follow.js';
@@ -77,30 +78,6 @@ function installPage(t, href) {
   return { location, writes, target };
 }
 
-function installManualTimers(t) {
-  const prior = {
-    setTimeout: globalThis.setTimeout,
-    clearTimeout: globalThis.clearTimeout,
-  };
-  const timers = new Map();
-  let timerId = 0;
-  globalThis.setTimeout = (fn) => {
-    timers.set(++timerId, fn);
-    return timerId;
-  };
-  globalThis.clearTimeout = (id) => timers.delete(id);
-  t.after(() => Object.assign(globalThis, prior));
-  return {
-    timers,
-    runAll() {
-      for (const [id, fn] of [...timers]) {
-        timers.delete(id);
-        fn();
-      }
-    },
-  };
-}
-
 /** A viewer whose camera flights land at once. */
 function fakeViewer() {
   const flights = [];

src/ui/views/intelHudView.test.mjs

@@ -1,3 +1,4 @@
+import '../../testSupport/stubMgrs.mjs';
 import { viewerEngine } from '../../testSupport/viewerEngine.mjs';
 // src/ui/views/intelHudView.test.mjs — the Intel HUD view renders what
 // IntelHUD publishes: its readouts, visibility, layout variant and colors.
@@ -10,30 +11,10 @@ import test from 'node:test';
 import assert from 'node:assert/strict';
 import { createApp, nextTick } from 'vue';
 import { createPinia } from 'pinia';
-import { registerHooks } from 'node:module';
 import { presentSelectedVessel } from '../../hudReadouts.js';
 import { useHudStore } from '../stores/hud.js';
 import IntelHudView from './IntelHudView.vue';
 
-const MGRS_STUB_URL = 'gev-test-stub:mgrs';
-registerHooks({
-  resolve(specifier, context, next) {
-    if (specifier === 'mgrs') return { url: MGRS_STUB_URL, shortCircuit: true };
-    return next(specifier, context);
-  },
-  load(url, context, next) {
-    if (url === MGRS_STUB_URL) {
-      return {
-        format: 'module',
-        shortCircuit: true,
-        source:
-          'export function forward() { return "10SEG55776339"; }\nexport default { forward };\n',
-      };
-    }
-    return next(url, context);
-  },
-});
-
 const { IntelHUD } = await import('../../hud.js');
 
 const listeners = () => ({ addEventListener() {}, removeEventListener() {} });