refactor: separate installation and proximity context components

src/layers/installations/source.test.mjs

@@ -0,0 +1,59 @@
+import assert from 'node:assert/strict';
+import test from 'node:test';
+import { createInstallationSource } from './source.js';
+
+const box = { south: 30.1, west: -97.9, north: 30.3, east: -97.6 };
+test('mapped-site sources validate viewport bounds and preserve the exact retry key', async () => {
+  const calls = [];
+  const source = createInstallationSource({
+    fetchImpl: async (url) => {
+      calls.push(new URL(url, 'https://example.test'));
+      return new Response(JSON.stringify({ elements: [], status: 'stale' }));
+    },
+  });
+  for (const invalid of [
+    null,
+    { ...box, east: Infinity },
+    { ...box, north: 90 },
+    { ...box, south: 31 },
+  ])
+    await assert.rejects(
+      source.getMappedSites(invalid),
+      /bounded installation viewport/,
+    );
+  assert.equal(calls.length, 0);
+  const payload = await source.getMappedSites(box, { exact: true });
+  assert.equal(payload.status, 'stale');
+  assert.equal(calls[0].pathname, '/api/military-installations');
+  assert.equal(calls[0].searchParams.get('exact'), '1');
+  assert.equal(calls[0].searchParams.get('south'), '30.10000');
+});
+test('malformed installation and place snapshots are never accepted as empty success', async () => {
+  const source = createInstallationSource({
+    fetchImpl: async () => new Response('{}'),
+  });
+  await assert.rejects(
+    source.getMappedSites(box),
+    /Malformed installation snapshot/,
+  );
+  await assert.rejects(
+    source.searchNearby({ latitude: 30.2, longitude: -97.7, radiusM: 1000 }),
+    /Malformed nearby-place snapshot/,
+  );
+});
+test('installation response parsing respects cancellation before any follow-on search', async () => {
+  const controller = new AbortController();
+  const source = createInstallationSource({
+    fetchImpl: async () => ({
+      ok: true,
+      json: async () => {
+        controller.abort();
+        return { elements: [] };
+      },
+    }),
+  });
+  await assert.rejects(
+    source.getMappedSites(box, { signal: controller.signal }),
+    { name: 'AbortError' },
+  );
+});