chore: import upstream snapshot with attribution

tests/unit/auth-noauth-fallback-loop-3061.test.ts

@@ -0,0 +1,93 @@
+/**
+ * Issue #3061 — No-auth providers (opencode / opencode-zen) infinite
+ * account-fallback loop on a persistent upstream error → unbounded DB growth /
+ * disk exhaustion.
+ *
+ * For a no-auth provider, getProviderCredentials early-returns synthetic
+ * credentials with connectionId "noauth" BEFORE honoring the exclusion set
+ * (src/sse/services/auth.ts: the NOAUTH_PROVIDERS block and the opencode-zen
+ * keyless fallback). So when the chat fallback loop marks the failed "noauth"
+ * connection and excludes it, the selector hands "noauth" right back → it loops
+ * forever, writing key-health + request logs every iteration until the disk
+ * fills (see @paraflu's "failure #320" trace in discussion #3038).
+ *
+ * Loop-breaking invariant under test: once "noauth" is in excludeConnectionIds,
+ * the selector MUST return null (no remaining candidate) so the chat handler
+ * stops after a single attempt instead of re-selecting the same synthetic
+ * connection. The happy-path (nothing excluded → synthetic noauth) must stay
+ * intact so keyless access still works.
+ */
+import test from "node:test";
+import assert from "node:assert/strict";
+import fs from "node:fs";
+import os from "node:os";
+import path from "node:path";
+
+const TEST_DATA_DIR = fs.mkdtempSync(path.join(os.tmpdir(), "omniroute-noauth-loop-3061-"));
+process.env.DATA_DIR = TEST_DATA_DIR;
+
+const core = await import("../../src/lib/db/core.ts");
+const { getProviderCredentials } = await import("../../src/sse/services/auth.ts");
+
+test.after(() => {
+  core.resetDbInstance();
+  fs.rmSync(TEST_DATA_DIR, { recursive: true, force: true });
+});
+
+// ── Happy path preserved: first selection (nothing excluded) still works ──
+
+test("#3061 opencode no-auth: first selection returns synthetic noauth (happy path preserved)", async () => {
+  const creds = await getProviderCredentials("opencode", null, null, "minimax-m2.5-free");
+  assert.ok(creds, "opencode must resolve to synthetic no-auth credentials on first selection");
+  assert.equal((creds as { connectionId?: string }).connectionId, "noauth");
+  assert.equal((creds as { apiKey?: unknown }).apiKey, null);
+});
+
+test("#3061 opencode-zen no-auth: first selection returns synthetic noauth (happy path preserved)", async () => {
+  const creds = await getProviderCredentials("opencode-zen");
+  assert.ok(creds, "opencode-zen must resolve to synthetic no-auth credentials on first selection");
+  assert.equal((creds as { connectionId?: string }).connectionId, "noauth");
+});
+
+test("#3061 mimocode no-auth: first selection returns synthetic noauth (happy path preserved)", async () => {
+  const creds = await getProviderCredentials("mimocode", null, null, "mimo-auto");
+  assert.ok(creds, "mimocode must resolve to synthetic no-auth credentials on first selection");
+  assert.equal((creds as { connectionId?: string }).connectionId, "noauth");
+  assert.equal((creds as { apiKey?: unknown }).apiKey, null);
+});
+
+// ── The fix: once "noauth" is excluded, selection MUST stop (return null) ──
+
+test("#3061 opencode no-auth: excluding 'noauth' returns null (breaks the fallback loop)", async () => {
+  const creds = await getProviderCredentials("opencode", null, null, "minimax-m2.5-free", {
+    excludeConnectionIds: ["noauth"],
+  });
+  assert.equal(
+    creds,
+    null,
+    "after the synthetic noauth connection failed and was excluded, the selector must return " +
+      "null instead of handing back 'noauth' (which would loop forever and fill the disk)"
+  );
+});
+
+test("#3061 opencode-zen no-auth: excluding 'noauth' returns null (breaks the fallback loop)", async () => {
+  const creds = await getProviderCredentials("opencode-zen", null, null, null, {
+    excludeConnectionIds: ["noauth"],
+  });
+  assert.equal(
+    creds,
+    null,
+    "excluded synthetic noauth must not be re-selected for the opencode-zen keyless path"
+  );
+});
+
+test("#3061 mimocode no-auth: excluding 'noauth' returns null (breaks the fallback loop)", async () => {
+  const creds = await getProviderCredentials("mimocode", null, null, "mimo-auto", {
+    excludeConnectionIds: ["noauth"],
+  });
+  assert.equal(
+    creds,
+    null,
+    "excluded synthetic noauth must not be re-selected for the mimocode keyless path"
+  );
+});