Extract duplicated code for app test cases into AppTestContext (#10968)

src/app/tests/AppTestContext.cpp

@@ -0,0 +1,47 @@
+/*
+ *    Copyright (c) 2021 Project CHIP 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
+ *
+ *        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 <app/tests/AppTestContext.h>
+
+#include <app/InteractionModelEngine.h>
+#include <lib/support/CodeUtils.h>
+#include <lib/support/ErrorStr.h>
+
+namespace chip {
+namespace Test {
+
+CHIP_ERROR AppContext::Init()
+{
+    ReturnErrorOnFailure(chip::Platform::MemoryInit());
+    ReturnErrorOnFailure(mIOContext.Init());
+    ReturnErrorOnFailure(mTransportManager.Init("LOOPBACK"));
+    ReturnErrorOnFailure(MessagingContext::Init(&mTransportManager, &mIOContext));
+    ReturnErrorOnFailure(chip::app::InteractionModelEngine::GetInstance()->Init(&GetExchangeManager(), nullptr));
+
+    return CHIP_NO_ERROR;
+}
+
+CHIP_ERROR AppContext::Shutdown()
+{
+    ReturnErrorOnFailure(MessagingContext::Shutdown());
+    ReturnErrorOnFailure(mIOContext.Shutdown());
+    chip::Platform::MemoryShutdown();
+
+    return CHIP_NO_ERROR;
+}
+
+} // namespace Test
+} // namespace chip

src/app/tests/AppTestContext.h

@@ -0,0 +1,57 @@
+/*
+ *    Copyright (c) 2021 Project CHIP 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
+ *
+ *        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.
+ */
+#pragma once
+
+#include <messaging/tests/MessagingContext.h>
+#include <transport/raw/tests/NetworkTestHelpers.h>
+
+#include <nlunit-test.h>
+
+namespace chip {
+namespace Test {
+
+/**
+ * @brief The context of test cases for messaging layer. It wil initialize network layer and system layer, and create
+ *        two secure sessions, connected with each other. Exchanges can be created for each secure session.
+ */
+class AppContext : public MessagingContext
+{
+public:
+    /// Initialize the underlying layers and test suite pointer
+    CHIP_ERROR Init();
+
+    // Shutdown all layers, finalize operations
+    CHIP_ERROR Shutdown();
+
+    static int Initialize(void * context)
+    {
+        auto * ctx = static_cast<AppContext *>(context);
+        return ctx->Init() == CHIP_NO_ERROR ? SUCCESS : FAILURE;
+    }
+
+    static int Finalize(void * context)
+    {
+        auto * ctx = static_cast<AppContext *>(context);
+        return ctx->Shutdown() == CHIP_NO_ERROR ? SUCCESS : FAILURE;
+    }
+
+private:
+    chip::TransportMgr<chip::Test::LoopbackTransport> mTransportManager;
+    chip::Test::IOContext mIOContext;
+};
+
+} // namespace Test
+} // namespace chip

src/app/tests/BUILD.gn

@@ -19,6 +19,24 @@ import("//build_overrides/nlunit_test.gni")
 import("${chip_root}/build/chip/chip_test_suite.gni")
 import("${chip_root}/src/platform/device.gni")
 
+static_library("helpers") {
+  output_name = "libAppTestHelpers"
+  output_dir = "${root_out_dir}/lib"
+
+  sources = [
+    "AppTestContext.cpp",
+    "AppTestContext.h",
+  ]
+
+  cflags = [ "-Wconversion" ]
+
+  deps = [
+    "${chip_root}/src/lib/support",
+    "${chip_root}/src/messaging/tests:helpers",
+    "${chip_root}/src/transport/raw/tests:helpers",
+  ]
+}
+
 chip_test_suite("tests") {
   output_name = "libAppTests"
 
@@ -49,11 +67,9 @@ chip_test_suite("tests") {
   public_deps = [
     "${chip_root}/src/app",
     "${chip_root}/src/app/common:cluster-objects",
+    "${chip_root}/src/app/tests:helpers",
     "${chip_root}/src/app/util:device_callbacks_manager",
     "${chip_root}/src/lib/core",
-    "${chip_root}/src/messaging/tests:helpers",
-    "${chip_root}/src/protocols",
-    "${chip_root}/src/transport/raw/tests:helpers",
     "${nlunit_test_root}:nlunit-test",
   ]