[Init] Initial commit - NetMesh terminal manager

application/state/sftp/sharedRemoteHostCache.test.ts

@@ -0,0 +1,57 @@
+import assert from "node:assert/strict";
+import test from "node:test";
+import {
+  MAX_SHARED_REMOTE_HOST_CACHE_ENTRIES,
+  MAX_SHARED_REMOTE_HOST_CACHE_FILES,
+  _getSharedRemoteHostCacheStatsForTests,
+  _resetSharedRemoteHostCacheForTests,
+  getSharedRemoteHostCache,
+  setSharedRemoteHostCache,
+} from "./sharedRemoteHostCache";
+
+const files = (count: number) => Array.from({ length: count }, (_value, index) => ({
+  name: `file-${index}`,
+})) as never[];
+
+const entry = (fileCount: number) => ({
+  path: "/",
+  homeDir: "/",
+  files: files(fileCount),
+  filenameEncoding: "utf-8" as const,
+});
+
+test("shared host cache is bounded across many different hosts", () => {
+  _resetSharedRemoteHostCacheForTests();
+  for (let index = 0; index < MAX_SHARED_REMOTE_HOST_CACHE_ENTRIES + 20; index += 1) {
+    setSharedRemoteHostCache(`host-${index}`, entry(1));
+  }
+
+  assert.equal(_getSharedRemoteHostCacheStatsForTests().entries, MAX_SHARED_REMOTE_HOST_CACHE_ENTRIES);
+  assert.equal(getSharedRemoteHostCache("host-0"), null);
+  assert.ok(getSharedRemoteHostCache(`host-${MAX_SHARED_REMOTE_HOST_CACHE_ENTRIES + 19}`));
+});
+
+test("shared host cache is bounded by retained file rows", () => {
+  _resetSharedRemoteHostCacheForTests();
+  const perHost = Math.floor(MAX_SHARED_REMOTE_HOST_CACHE_FILES * 0.6);
+  setSharedRemoteHostCache("large-a", entry(perHost));
+  setSharedRemoteHostCache("large-b", entry(perHost));
+
+  assert.deepEqual(_getSharedRemoteHostCacheStatsForTests(), {
+    entries: 1,
+    files: perHost,
+  });
+  assert.equal(getSharedRemoteHostCache("large-a"), null);
+  assert.ok(getSharedRemoteHostCache("large-b"));
+});
+
+test("shared host cache skips one listing larger than the global file budget", () => {
+  _resetSharedRemoteHostCacheForTests();
+  setSharedRemoteHostCache("oversized", entry(MAX_SHARED_REMOTE_HOST_CACHE_FILES + 1));
+
+  assert.deepEqual(_getSharedRemoteHostCacheStatsForTests(), {
+    entries: 0,
+    files: 0,
+  });
+  assert.equal(getSharedRemoteHostCache("oversized"), null);
+});