How to initialize constant string for multiple tests in google test?
I am using google test and I have a cpp file containing several tests. I would like to initialize a string with the current date and time of the start of the first test. I would like to use this line in all other tests too. How can i do this.
I tried the following ( m_string
was a protected member CnFirstTest
), but it didn't work (since the constructor and SetUp
will be called before each test):
CnFirstTest::CnFirstTest(void) {
m_string = currentDateTime();
}
void CnFirstTest::SetUp() {
}
TEST_F(CnFirstTest, Test1) {
// use m_string
}
TEST_F(CnFirstTest, Test2) {
// use m_string, too
}
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1 answer
To achieve this, you can use gtest testing::Environment
:
#include <chrono>
#include <iostream>
#include "gtest/gtest.h"
std::string currentDateTime() {
return std::to_string(std::chrono::steady_clock::now().time_since_epoch().count());
}
class TestEnvironment : public ::testing::Environment {
public:
// Assume there only going to be a single instance of this class, so we can just
// hold the timestamp as a const static local variable and expose it through a
// static member function
static std::string getStartTime() {
static const std::string timestamp = currentDateTime();
return timestamp;
}
// Initialise the timestamp.
virtual void SetUp() { getStartTime(); }
};
class CnFirstTest : public ::testing::Test {
protected:
virtual void SetUp() { m_string = currentDateTime(); }
std::string m_string;
};
TEST_F(CnFirstTest, Test1) {
std::cout << TestEnvironment::getStartTime() << std::endl;
std::cout << m_string << std::endl;
}
TEST_F(CnFirstTest, Test2) {
std::cout << TestEnvironment::getStartTime() << std::endl;
std::cout << m_string << std::endl;
}
int main(int argc, char* argv[]) {
::testing::InitGoogleTest(&argc, argv);
// gtest takes ownership of the TestEnvironment ptr - we don't delete it.
::testing::AddGlobalTestEnvironment(new TestEnvironment);
return RUN_ALL_TESTS();
}
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