test(routing): guard Astra vision cutover (#13810)

Co-authored-by: ginettododo <117327638+ginettododo@users.noreply.github.com>

tests/unit/prompt194-astra-vision-compat.test.ts

@@ -0,0 +1,74 @@
+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-194-astra-vision-"));
+const ORIGINAL_DATA_DIR = process.env.DATA_DIR;
+process.env.DATA_DIR = TEST_DATA_DIR;
+process.env.API_KEY_SECRET = process.env.API_KEY_SECRET || "prompt194-astra-vision-test-secret";
+
+const { getResolvedModelCapabilities } = await import("../../src/lib/modelCapabilities.ts");
+const core = await import("../../src/lib/db/core.ts");
+const { isVisionIncompatibleTarget } =
+  await import("../../open-sse/services/combo/comboStructure.ts");
+import type { ResolvedComboTarget } from "../../open-sse/services/combo/types.ts";
+
+const visionRequirements = {
+  requiresTools: false,
+  requiresVision: true,
+  requiresStructuredOutput: false,
+  estimatedInputTokens: 1,
+  requestedOutputTokens: 1,
+  requiredContextTokens: 1,
+};
+
+function target(provider: string, modelStr: string): ResolvedComboTarget {
+  return {
+    kind: "model",
+    stepId: `${provider}:${modelStr}`,
+    executionKey: `${provider}:${modelStr}`,
+    modelStr,
+    provider,
+    providerId: provider,
+    connectionId: "prompt194-provider-free",
+    weight: 1,
+    label: null,
+  };
+}
+
+test.after(() => {
+  core.resetDbInstance();
+  fs.rmSync(TEST_DATA_DIR, { recursive: true, force: true, maxRetries: 5, retryDelay: 100 });
+  if (ORIGINAL_DATA_DIR === undefined) delete process.env.DATA_DIR;
+  else process.env.DATA_DIR = ORIGINAL_DATA_DIR;
+});
+
+test("prompt194: codex/gpt-6-astra remains admitted for image requests", () => {
+  const astra = target("codex", "codex/gpt-6-astra");
+  assert.equal(
+    getResolvedModelCapabilities({ provider: "codex", model: astra.modelStr }).supportsVision,
+    true
+  );
+  assert.equal(isVisionIncompatibleTarget(astra, visionRequirements), false);
+});
+
+test("prompt194: unknown and explicit non-vision targets remain fail-closed", () => {
+  const unknown = target("unknown-provider", "unknown-model");
+  const nonVision = target("cnl", "deepseek/deepseek-v4-pro");
+
+  assert.equal(
+    getResolvedModelCapabilities({ provider: unknown.providerId, model: unknown.modelStr })
+      .supportsVision,
+    null
+  );
+  assert.equal(isVisionIncompatibleTarget(unknown, visionRequirements), true);
+
+  assert.equal(
+    getResolvedModelCapabilities({ provider: nonVision.providerId, model: nonVision.modelStr })
+      .supportsVision,
+    false
+  );
+  assert.equal(isVisionIncompatibleTarget(nonVision, visionRequirements), true);
+});