Function getEnvVarValue

tests/utils/config.cpp:20–25

 */

string getEnvVarValue(string name) {

    // unspecified var returns empty string
    const char* ptr = std::getenv(name.c_str());
    return (ptr == nullptr)? "" : std::string(ptr);
}

int getIntEnvVarValueOrDefault(string name, int defaultValue) {