Integrated gmock

.gitmodules

@@ -324,3 +324,7 @@
 	url = https://github.com/Infineon/optiga-trust-m.git
 	branch = matter_support
 	platforms = infineon
+[submodule "third_party/googletest/repo"]
+	path = third_party/googletest/repo
+	url = https://github.com/google/googletest.git
+	branch = v1.14.x

BUILD.gn

@@ -14,6 +14,7 @@
 
 import("//build_overrides/build.gni")
 import("//build_overrides/chip.gni")
+import("//build_overrides/googletest.gni")
 import("//build_overrides/mbedtls.gni")
 import("//build_overrides/nlassert.gni")
 import("//build_overrides/nlunit_test.gni")

build_overrides/googletest.gni

@@ -0,0 +1,18 @@
+# Copyright (c) 2024 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.
+
+declare_args() {
+  # Root directory for googletest.
+  googletest_root = "//third_party/googletest"
+}

examples/build_overrides/googletest.gni

@@ -0,0 +1,18 @@
+# Copyright (c) 2024 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.
+
+declare_args() {
+  # Root directory for nlassert.
+  googletest_root = "//third_party/googletest"
+}

src/lib/support/tests/BUILD.gn

@@ -14,6 +14,7 @@
 
 import("//build_overrides/build.gni")
 import("//build_overrides/chip.gni")
+import("//build_overrides/googletest.gni")
 import("//build_overrides/nlunit_test.gni")
 import("//build_overrides/pigweed.gni")
 
@@ -44,6 +45,7 @@ chip_test_suite("tests") {
     "TestErrorStr.cpp",
     "TestFixedBufferAllocator.cpp",
     "TestFold.cpp",
+    "TestGmockUsage.cpp",
     "TestIniEscaping.cpp",
     "TestIntrusiveList.cpp",
     "TestJsonToTlv.cpp",
@@ -93,5 +95,6 @@ chip_test_suite("tests") {
     "${chip_root}/src/lib/support:testing",
     "${chip_root}/src/lib/support/jsontlv",
     "${chip_root}/src/platform",
+    "${googletest_root}:googlemock",
   ]
 }

src/lib/support/tests/TestGmockUsage.cpp

@@ -0,0 +1,40 @@
+#include <gmock/gmock.h>
+#include <gtest/gtest.h>
+
+using ::testing::Return;
+
+// Define the interface
+class Foo
+{
+public:
+    virtual ~Foo()                 = default;
+    virtual int DoSomething(int a) = 0;
+};
+
+// Create the mock class
+class MockFoo : public Foo
+{
+public:
+    MOCK_METHOD(int, DoSomething, (int a), (override));
+};
+
+// Test function that uses Foo
+int UseFoo(Foo * foo, int value)
+{
+    return foo->DoSomething(value);
+}
+
+// Test case
+TEST(GMockTest, BasicValidation)
+{
+    MockFoo mock_foo;
+
+    // Set up the expectation
+    EXPECT_CALL(mock_foo, DoSomething(5)).WillOnce(Return(10));
+
+    // Call the function with the mock object
+    int result = UseFoo(&mock_foo, 5);
+
+    // Validate the result
+    EXPECT_EQ(result, 11);
+}

third_party/googletest/BUILD.gn

@@ -0,0 +1,78 @@
+# Copyright (c) 2024 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.
+
+import("//build_overrides/build.gni")
+import("${build_root}/config/compiler/compiler.gni")
+
+config("googletest_config") {
+  include_dirs = [
+    "repo/googletest/include",
+    "repo/googletest",
+  ]
+}
+
+static_library("googletest") {
+  output_name = "libgoogletest"
+
+  include_dirs = [
+    "repo/googletest/include",
+    "repo/googletest",
+  ]
+
+  sources = [
+    "repo/googletest/src/gtest-all.cc",
+    "repo/googletest/src/gtest-assertion-result.cc",
+    "repo/googletest/src/gtest-death-test.cc",
+    "repo/googletest/src/gtest-filepath.cc",
+    "repo/googletest/src/gtest-internal-inl.h",
+    "repo/googletest/src/gtest-matchers.cc",
+    "repo/googletest/src/gtest-port.cc",
+    "repo/googletest/src/gtest-printers.cc",
+    "repo/googletest/src/gtest-test-part.cc",
+    "repo/googletest/src/gtest-typed-test.cc",
+    "repo/googletest/src/gtest.cc",
+    "repo/googletest/src/gtest_main.cc",
+  ]
+
+  public_configs = [ ":googletest_config" ]
+}
+
+config("googlemock_config") {
+  include_dirs = [ "repo/googlemock/include" ]
+}
+
+static_library("googlemock") {
+  output_name = "libgooglemock"
+
+  include_dirs = [
+    "repo/googlemock/include",
+    "repo/googlemock",
+  ]
+
+  sources = [
+    "repo/googlemock/src/gmock-all.cc",
+    "repo/googlemock/src/gmock-cardinalities.cc",
+    "repo/googlemock/src/gmock-internal-utils.cc",
+    "repo/googlemock/src/gmock-matchers.cc",
+    "repo/googlemock/src/gmock-spec-builders.cc",
+    "repo/googlemock/src/gmock.cc",
+    "repo/googlemock/src/gmock_main.cc",
+  ]
+
+  deps = [ ":googletest" ]
+  public_configs = [
+    ":googlemock_config",
+    ":googletest_config",
+  ]
+}