test: share provider stream capture helper

test/helpers/plugins/stream-hooks.ts

@@ -0,0 +1,18 @@
+import type { StreamFn } from "@mariozechner/pi-agent-core";
+
+export function createCapturedThinkingConfigStream() {
+  let capturedPayload: Record<string, unknown> | undefined;
+  const streamFn: StreamFn = (model, _context, options) => {
+    const payload = { config: { thinkingConfig: { thinkingBudget: -1 } } } as Record<
+      string,
+      unknown
+    >;
+    options?.onPayload?.(payload as never, model as never);
+    capturedPayload = payload;
+    return {} as never;
+  };
+  return {
+    streamFn,
+    getCapturedPayload: () => capturedPayload,
+  };
+}