Add support for reading multiple frames from one BlockingQueueStream buffer

PiperOrigin-RevId: 709247147

internal/platform/blocking_queue_stream_test.cc

@@ -0,0 +1,71 @@
+// Copyright 2024 Google LLC
+//
+// 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.
+
+#include "internal/platform/blocking_queue_stream.h"
+
+#include "gtest/gtest.h"
+#include "connections/implementation/flags/nearby_connections_feature_flags.h"
+#include "internal/flags/nearby_flags.h"
+#include "internal/platform/byte_array.h"
+#include "internal/platform/exception.h"
+
+namespace nearby {
+namespace {
+
+TEST(BlockingQueueStreamTest, ReadSuccess) {
+  bool is_multiplex_enabled = NearbyFlags::GetInstance().GetBoolFlag(
+      connections::config_package_nearby::nearby_connections_feature::
+          kEnableMultiplex);
+  NearbyFlags::GetInstance().OverrideBoolFlagValue(
+      connections::config_package_nearby::nearby_connections_feature::
+          kEnableMultiplex, true);
+
+  BlockingQueueStream stream;
+  ByteArray bytes = ByteArray("test1test2test3");
+  stream.Write(bytes);
+  ExceptionOr<ByteArray> result = stream.Read(5);
+  EXPECT_EQ(result.result(), ByteArray("test1"));
+  result = stream.Read(5);
+  EXPECT_EQ(result.result(), ByteArray("test2"));
+  result = stream.Read(5);
+  EXPECT_EQ(result.result(), ByteArray("test3"));
+  stream.Close();
+
+  NearbyFlags::GetInstance().OverrideBoolFlagValue(
+      connections::config_package_nearby::nearby_connections_feature::
+          kEnableMultiplex, is_multiplex_enabled);
+}
+
+TEST(BlockingQueueStreamTest, MultiplexDisabled) {
+  bool is_multiplex_enabled = NearbyFlags::GetInstance().GetBoolFlag(
+      connections::config_package_nearby::nearby_connections_feature::
+          kEnableMultiplex);
+  NearbyFlags::GetInstance().OverrideBoolFlagValue(
+      connections::config_package_nearby::nearby_connections_feature::
+          kEnableMultiplex, false);
+
+  BlockingQueueStream stream;
+  ByteArray bytes = ByteArray("test1test2test3");
+  stream.Write(bytes);
+  ExceptionOr<ByteArray> result = stream.Read(5);
+  EXPECT_EQ(result, ExceptionOr<ByteArray>(Exception::kExecution));
+  stream.Close();
+
+  NearbyFlags::GetInstance().OverrideBoolFlagValue(
+      connections::config_package_nearby::nearby_connections_feature::
+          kEnableMultiplex, is_multiplex_enabled);
+}
+
+}  // namespace
+}  // namespace nearby