111 lines
3.5 KiB
C++
111 lines
3.5 KiB
C++
// Copyright 2022 Haute école d'ingénierie et d'architecture de Fribourg
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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/****************************************************************************
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* @file main.cpp
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* @author Serge Ayer <serge.ayer@hefr.ch>
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*
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* @brief Simple example of test program for raw and shared pointers
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*
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* @date 2022-09-01
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* @version 0.1.0
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***************************************************************************/
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#include "greentea-client/test_env.h"
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#include "mbed.h"
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#include "unity/unity.h"
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#include "utest/utest.h"
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using namespace utest::v1;
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struct Test {
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Test() {
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_instanceCount++;
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_value = kMagicNumber;
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}
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~Test() {
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_instanceCount--;
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_value = 0;
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}
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int _value;
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static constexpr uint32_t kMagicNumber = 33;
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static uint32_t _instanceCount;
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};
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uint32_t Test::_instanceCount = 0;
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/**
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* Test that a shared pointer correctly manages the lifetime of the underlying raw pointer
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*/
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void test_single_sharedptr_lifetime() {
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// Sanity-check value of counter
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TEST_ASSERT_EQUAL(0, Test::_instanceCount);
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// Create and destroy shared pointer in given scope
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{
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std::shared_ptr<Test> shared_ptr(new Test);
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TEST_ASSERT_EQUAL(1, Test::_instanceCount);
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TEST_ASSERT_EQUAL(Test::kMagicNumber, shared_ptr->_value);
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}
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// Destroy shared pointer
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TEST_ASSERT_EQUAL(0, Test::_instanceCount);
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}
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/**
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* Test that multiple instances of shared pointers correctly manage the reference count
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* to release the object at the correct point
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*/
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void test_instance_sharing() {
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std::shared_ptr<Test> shared_ptr1(nullptr);
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// Sanity-check value of counter
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TEST_ASSERT_EQUAL(0, Test::_instanceCount);
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// Create and destroy shared pointer in given scope
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{
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std::shared_ptr<Test> shared_ptr2(new Test);
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TEST_ASSERT_EQUAL(1, Test::_instanceCount);
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// share share_ptr2 with shared_ptr1
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shared_ptr1 = shared_ptr2;
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// still one instance only
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TEST_ASSERT_EQUAL(1, Test::_instanceCount);
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TEST_ASSERT_EQUAL(Test::kMagicNumber, shared_ptr1->_value);
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TEST_ASSERT(shared_ptr1.get() == shared_ptr2.get());
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}
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// shared_ptr1 still owns a raw pointer
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TEST_ASSERT_EQUAL(1, Test::_instanceCount);
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shared_ptr1 = nullptr;
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// Shared pointer has been destroyed
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TEST_ASSERT_EQUAL(0, Test::_instanceCount);
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}
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static utest::v1::status_t greentea_setup(const size_t number_of_cases) {
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// Here, we specify the timeout (60s) and the host test (a built-in host test or the
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// name of our Python file)
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GREENTEA_SETUP(60, "default_auto");
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return greentea_test_setup_handler(number_of_cases);
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}
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// List of test cases in this file
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static Case cases[] = {
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Case("Test single shared pointer instance", test_single_sharedptr_lifetime),
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Case("Test instance sharing across multiple shared pointers", test_instance_sharing)};
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static Specification specification(greentea_setup, cases);
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int main() { return !Harness::run(specification); } |