Apply item 0x4ac69e55 for issue #10

Squash of the patch of item 0x4ac69e554cfa29c1fb7819e9835c17153233e73e72ecb0b821628233c820eb3c, final in the elffuss ledger.
Solver 0xdd8075ba73c2173b9f05957b5f1a7561600e5494; 2 approvals of round 0.

T2T-Item: 0x4ac69e554cfa29c1fb7819e9835c17153233e73e72ecb0b821628233c820eb3c
T2T-Issue: 0xb8d7c6d9815eb6af5efae391d136467cda8c028200c2b5ec5a36fa6620196c53
T2T-Event: 0x96cb4689693dca2b068c24579b325bee24f431c0e6c31a1d7f0b39f8810f534f

tests/acceptance/10/CRITERIA.json

@@ -0,0 +1,18 @@
+{
+  "schema": "elffuss-t2t/criteria@2",
+  "issue": 10,
+  "criteria": [
+    {
+      "index": 1,
+      "tests": [
+        "tests/acceptance/10/criteria.test.js::criterion 1"
+      ]
+    },
+    {
+      "index": 2,
+      "tests": [
+        "tests/acceptance/10/criteria.test.js::criterion 2"
+      ]
+    }
+  ]
+}

tests/acceptance/10/criteria.test.js

@@ -0,0 +1,31 @@
+import test from 'node:test'
+import assert from 'node:assert/strict'
+const mod = await import('../../../web/js/model-cache.js')
+
+function setNavigator(value) {
+  Object.defineProperty(globalThis, 'navigator', { value, configurable: true, writable: true })
+}
+
+test('criterion 1', async () => {
+  const removed = []
+  const deletedCaches = []
+  const root = {
+    async removeEntry(name, opts) { removed.push([name, opts]) },
+  }
+  setNavigator({ storage: { getDirectory: async () => root } })
+  globalThis.caches = { delete: async (n) => { deletedCaches.push(n); return true } }
+
+  await mod.clearModelCache()
+
+  assert.ok(removed.some(([n]) => n === 'elffuss-models'))
+  assert.deepEqual(deletedCaches, ['elffuss-models-v1'])
+})
+
+test('criterion 2', async () => {
+  let calls = 0
+  setNavigator({ storage: { getDirectory: async () => { calls++; throw new Error('sin OPFS') } } })
+  globalThis.caches = { delete: async () => true }
+
+  await assert.doesNotReject(mod.clearModelCache())
+  assert.equal(calls, 1)
+})