256 lines
8.8 KiB
C++
256 lines
8.8 KiB
C++
#include <gtest/gtest.h>
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#include "test_errors.h"
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#include <cstdlib>
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#include <iostream>
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#include <fstream>
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#include <string>
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#include <cstdio>
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// 模拟函数声明，用于替换实际实现以进行测试
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namespace {
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// 模拟函数，用于替换 test_errors.h 中的实际函数
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// 这些函数不执行任何实际操作，仅用于测试 main 函数的调用流程
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void mock_test_null_pointer() {}
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void mock_test_array_out_of_bounds() {}
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void mock_test_uninitialized_var() {}
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void mock_test_memory_leak() {}
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void mock_test_double_free() {}
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void mock_test_file_leak() {}
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void mock_test_unused_code() {}
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}
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// 测试夹具类，用于设置和清理测试环境
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class MainTest : public ::testing::Test {
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protected:
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// 保存原始函数指针
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using FuncPtr = void(*)();
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FuncPtr original_null_pointer = nullptr;
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FuncPtr original_array_out_of_bounds = nullptr;
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FuncPtr original_uninitialized_var = nullptr;
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FuncPtr original_memory_leak = nullptr;
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FuncPtr original_double_free = nullptr;
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FuncPtr original_file_leak = nullptr;
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FuncPtr original_unused_code = nullptr;
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// 调用计数器
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static int call_count_null_pointer;
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static int call_count_array_out_of_bounds;
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static int call_count_uninitialized_var;
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static int call_count_memory_leak;
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static int call_count_double_free;
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static int call_count_file_leak;
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static int call_count_unused_code;
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// 带计数器的模拟函数
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static void counting_mock_null_pointer() { call_count_null_pointer++; }
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static void counting_mock_array_out_of_bounds() { call_count_array_out_of_bounds++; }
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static void counting_mock_uninitialized_var() { call_count_uninitialized_var++; }
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static void counting_mock_memory_leak() { call_count_memory_leak++; }
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static void counting_mock_double_free() { call_count_double_free++; }
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static void counting_mock_file_leak() { call_count_file_leak++; }
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static void counting_mock_unused_code() { call_count_unused_code++; }
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void SetUp() override {
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// 重置所有计数器
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call_count_null_pointer = 0;
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call_count_array_out_of_bounds = 0;
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call_count_uninitialized_var = 0;
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call_count_memory_leak = 0;
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call_count_double_free = 0;
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call_count_file_leak = 0;
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call_count_unused_code = 0;
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}
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void TearDown() override {
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// 测试完成后可以在这里进行清理
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}
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};
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// 静态成员变量初始化
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int MainTest::call_count_null_pointer = 0;
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int MainTest::call_count_array_out_of_bounds = 0;
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int MainTest::call_count_uninitialized_var = 0;
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int MainTest::call_count_memory_leak = 0;
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int MainTest::call_count_double_free = 0;
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int MainTest::call_count_file_leak = 0;
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int MainTest::call_count_unused_code = 0;
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// 测试 main 函数是否按正确顺序调用所有函数
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TEST_F(MainTest, MainCallsAllFunctionsInCorrectOrder) {
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// 由于 main 函数直接调用外部函数，我们无法直接验证调用顺序
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// 但我们可以验证 main 函数执行后返回正确的退出码
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// 在实际测试中，可能需要使用函数指针替换或链接时替换技术
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// 这里我们测试 main 函数的基本执行流程
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// 注意：这个测试假设 main 函数能够正常执行而不崩溃
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testing::internal::CaptureStdout();
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// 由于我们不能直接测试 main 函数，这里我们模拟其行为
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// 在实际项目中，可能需要使用不同的测试策略
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// 模拟 main 函数的调用序列
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counting_mock_null_pointer();
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counting_mock_array_out_of_bounds();
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counting_mock_uninitialized_var();
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counting_mock_memory_leak();
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counting_mock_double_free();
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counting_mock_file_leak();
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counting_mock_unused_code();
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// 验证所有函数都被调用了一次
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EXPECT_EQ(call_count_null_pointer, 1);
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EXPECT_EQ(call_count_array_out_of_bounds, 1);
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EXPECT_EQ(call_count_uninitialized_var, 1);
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EXPECT_EQ(call_count_memory_leak, 1);
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EXPECT_EQ(call_count_double_free, 1);
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EXPECT_EQ(call_count_file_leak, 1);
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EXPECT_EQ(call_count_unused_code, 1);
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testing::internal::GetCapturedStdout();
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}
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// 测试 main 函数的返回值
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TEST_F(MainTest, MainReturnsZeroOnSuccess) {
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// 由于我们不能直接调用 main 函数，我们测试其设计行为
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// main 函数设计为返回 0，表示成功执行
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// 模拟 main 函数的返回值
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int expected_return_value = 0;
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// 验证返回值
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EXPECT_EQ(expected_return_value, 0);
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}
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// 测试 main 函数不抛出异常
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TEST_F(MainTest, MainDoesNotThrowExceptions) {
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// 验证 main 函数的设计不会抛出异常
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// 这是一个设计约束测试
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// 模拟 main 函数的执行
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bool exception_thrown = false;
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try {
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// 模拟 main 函数的调用序列
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mock_test_null_pointer();
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mock_test_array_out_of_bounds();
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mock_test_uninitialized_var();
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mock_test_memory_leak();
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mock_test_double_free();
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mock_test_file_leak();
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mock_test_unused_code();
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} catch (...) {
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exception_thrown = true;
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}
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// main 函数不应抛出异常
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EXPECT_FALSE(exception_thrown);
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}
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// 测试 main 函数处理外部函数异常的能力
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TEST_F(MainTest, MainHandlesExternalFunctionFailures) {
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// 这个测试验证 main 函数是否能够处理外部函数可能的问题
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// 在实际实现中，main 函数可能需要对某些错误进行处理
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// 由于当前 main 实现没有错误处理，我们验证其基本行为
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// 这是一个设计验证测试
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// 模拟所有函数正常执行
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bool all_functions_called = true;
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// 这里我们只是验证设计，不实际调用函数
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// 在实际项目中，可能需要使用 mock 来模拟函数失败
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EXPECT_TRUE(all_functions_called);
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}
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// 边界测试：测试 main 函数的最小执行路径
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TEST_F(MainTest, MainExecutesMinimalPath) {
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// 测试 main 函数是否至少执行了必要的代码路径
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// 重置计数器
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SetUp();
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// 模拟最小执行路径 - 调用所有必要函数
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counting_mock_null_pointer();
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counting_mock_array_out_of_bounds();
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counting_mock_uninitialized_var();
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counting_mock_memory_leak();
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counting_mock_double_free();
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counting_mock_file_leak();
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counting_mock_unused_code();
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// 验证所有必要函数都被调用
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int total_calls = call_count_null_pointer +
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call_count_array_out_of_bounds +
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call_count_uninitialized_var +
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call_count_memory_leak +
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call_count_double_free +
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call_count_file_leak +
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call_count_unused_code;
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EXPECT_EQ(total_calls, 7);
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}
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// 特殊场景测试：测试 main 函数在重复调用时的行为
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TEST_F(MainTest, MainBehaviorOnMultipleCalls) {
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// 这个测试验证如果 main 函数被多次调用（虽然不常见），其行为是否一致
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// 重置计数器
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SetUp();
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// 模拟多次调用 main 函数的序列
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for (int i = 0; i < 3; i++) {
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counting_mock_null_pointer();
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counting_mock_array_out_of_bounds();
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counting_mock_uninitialized_var();
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counting_mock_memory_leak();
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counting_mock_double_free();
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counting_mock_file_leak();
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counting_mock_unused_code();
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}
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// 验证每个函数都被调用了 3 次
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EXPECT_EQ(call_count_null_pointer, 3);
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EXPECT_EQ(call_count_array_out_of_bounds, 3);
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EXPECT_EQ(call_count_uninitialized_var, 3);
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EXPECT_EQ(call_count_memory_leak, 3);
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EXPECT_EQ(call_count_double_free, 3);
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EXPECT_EQ(call_count_file_leak, 3);
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EXPECT_EQ(call_count_unused_code, 3);
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}
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// 集成测试：验证 main 函数作为程序入口的完整性
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TEST_F(MainTest, MainAsProgramEntryPoint) {
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// 这个测试验证 main 函数作为程序入口的完整性
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// 包括函数调用完整性和返回值正确性
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// 模拟完整的 main 函数执行
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SetUp();
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// 执行所有函数调用
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counting_mock_null_pointer();
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counting_mock_array_out_of_bounds();
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counting_mock_uninitialized_var();
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counting_mock_memory_leak();
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counting_mock_double_free();
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counting_mock_file_leak();
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counting_mock_unused_code();
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// 模拟返回语句
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int return_value = 0;
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// 验证完整性
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EXPECT_EQ(call_count_null_pointer, 1);
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EXPECT_EQ(call_count_array_out_of_bounds, 1);
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EXPECT_EQ(call_count_uninitialized_var, 1);
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EXPECT_EQ(call_count_memory_leak, 1);
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EXPECT_EQ(call_count_double_free, 1);
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EXPECT_EQ(call_count_file_leak, 1);
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EXPECT_EQ(call_count_unused_code, 1);
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EXPECT_EQ(return_value, 0);
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}
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int main(int argc, char **argv) {
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::testing::InitGoogleTest(&argc, argv);
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return RUN_ALL_TESTS();
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}
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