L2CAP: ClassicFixedChannelAllocator

This is a utility class for L2CAP link to manage channels

Test: bluetooth_test_gd
Bug: 138261142
Change-Id: I1adaaf29817371bb3f0e68d64f6aec3d3eea2c85
diff --git a/gd/l2cap/internal/classic_fixed_channel_allocator_test.cc b/gd/l2cap/internal/classic_fixed_channel_allocator_test.cc
new file mode 100644
index 0000000..8249a4c
--- /dev/null
+++ b/gd/l2cap/internal/classic_fixed_channel_allocator_test.cc
@@ -0,0 +1,61 @@
+/*
+ * Copyright 2019 The Android Open Source Project
+ *
+ * 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
+ *
+ *      http://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 "l2cap/internal/classic_fixed_channel_allocator.h"
+
+#include <gtest/gtest.h>
+
+namespace bluetooth {
+namespace l2cap {
+namespace internal {
+
+class L2capClassicFixedChannelAllocatorTest : public ::testing::Test {
+ protected:
+  void SetUp() override {
+    thread_ = new os::Thread("test_thread", os::Thread::Priority::NORMAL);
+    handler_ = new os::Handler(thread_);
+    channel_allocator_ = std::make_unique<ClassicFixedChannelAllocator>(handler_);
+  }
+
+  void TearDown() override {
+    channel_allocator_.reset();
+    handler_->Clear();
+    delete handler_;
+    delete thread_;
+  }
+
+  os::Thread* thread_{nullptr};
+  os::Handler* handler_{nullptr};
+  std::unique_ptr<ClassicFixedChannelAllocator> channel_allocator_;
+};
+
+TEST_F(L2capClassicFixedChannelAllocatorTest, precondition) {
+  Cid cid = kFirstFixedChannel;
+  EXPECT_FALSE(channel_allocator_->IsChannelInUse(cid));
+}
+
+TEST_F(L2capClassicFixedChannelAllocatorTest, allocate_and_free_channel) {
+  Cid cid = kFirstFixedChannel;
+  auto* channel = channel_allocator_->AllocateChannel(cid, {});
+  EXPECT_TRUE(channel_allocator_->IsChannelInUse(cid));
+  EXPECT_EQ(channel, channel_allocator_->FindChannel(cid));
+  EXPECT_TRUE(channel_allocator_->FreeChannel(cid));
+  EXPECT_FALSE(channel_allocator_->IsChannelInUse(cid));
+}
+
+}  // namespace internal
+}  // namespace l2cap
+}  // namespace bluetooth