create backstage file and four-number.js
create directory: game-rule and io , main.js for this project
create directory:backstage\game-rule-io and file:main_test.js in __tests__
code four_number_test file completely
install lodash and ignore directory of node_modules
complete four-number.js and test pass
complete code game_rule_test.js
complete GameRule.IsFourNotRepeat() and test pass
add beforeEach in game_rule_test.js
Coding test of getAorBorC completely
Coding GameRule.getAorBorC() and test pass
refactor GameRule.getAorBorC() replace if-(if-else)-else of ternary expression
Coding test of getScore() completely
Coding GameRule.getScore() and test pass
add test array type in four_number_test.js
Coding input.js
add beforeEach in input_test.js
add test Input.invertIntType() in input_test.js
Coding output_test.js completely
Coding io/output.js completely