Fix -> Engines && unit_test: in JWTEngine remove some useless methods and lines, also add pragma no cover lines for some lines that can't be tested, and in unit_test in test_jwt_engine finish all test to fully cover the JWTEngine file
Fix -> Engines && unit_test: in JWTEngine remove some useless methods and lines, also add pragma no cover lines for some lines that can't be tested, and in unit_test in test_jwt_engine finish all test to fully cover the JWTEngine file