Update ex14_22_TEST.cpp
Update ex14_22_TEST.cpp

The original main() only calls the constructor Sales_data(const std::string &s) but not the assignment operator.
Mooophy/Cpp-Primer,Soyn/Cpp-Primer,Mooophy/Cpp-Primer,sanerror/Cpp-Primer,andersy005/Cpp-Primer,sanerror/Cpp-Primer,AndychenCL/Cpp-Primer,AndychenCL/Cpp-Primer,andersy005/Cpp-Primer,Soyn/Cpp-Primer