1 files changed, 42 insertions, 0 deletions
diff --git a/pw_rpc/public/pw_rpc/thread_testing.h b/pw_rpc/public/pw_rpc/thread_testing.h
new file mode 100644
index 000000000..eb723a2cf
--- /dev/null
+++ b/pw_rpc/public/pw_rpc/thread_testing.h
@@ -0,0 +1,42 @@
+// Copyright 2022 The Pigweed Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may not
+// use this file except in compliance with the License. You may obtain a copy of
+// the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+// License for the specific language governing permissions and limitations under
+// the License.
+#pragma once
+
+#include <chrono>
+
+#include "pw_assert/assert.h"
+#include "pw_rpc/internal/fake_channel_output.h"
+#include "pw_sync/counting_semaphore.h"
+
+namespace pw::rpc::test {
+
+// Wait until the provided RawFakeChannelOutput or NanopbFakeChannelOutput
+// receives the specified number of packets.
+template <unsigned kTimeoutSeconds = 10, typename Function>
+void WaitForPackets(internal::test::FakeChannelOutput& output,
+                    int count,
+                    Function&& run_before) {
+  sync::CountingSemaphore sem;
+  output.set_on_send([&sem](ConstByteSpan, Status) { sem.release(); });
+
+  run_before();
+
+  for (int i = 0; i < count; ++i) {
+    PW_ASSERT(sem.try_acquire_for(std::chrono::seconds(kTimeoutSeconds)));
+  }
+
+  output.set_on_send(nullptr);
+}
+
+}  // namespace pw::rpc::test