tests: move the check of exec.skip to detect compilation error

Signed-off-by: Jean Privat <jean@pryen.org>
lib/standard: Added is_upper and is_lower to string.nit

Signed-off-by: Frédéric Vachon <fredvac@gmail.com>
lib/standard: Added to_snake_case and to_camel_case to string.nit

Signed-off-by: Frédéric Vachon <fredvac@gmail.com>
Merge: String: Added four new methods to string.nit

Four new methods have been added to abstract class Text : is_upper, is_lower, to_snake_case, to_camel_case. The latter two relies on the two others in their implementation. Converting case may be useful for code generation, especially when wrapping extern classes in order to conform to snake case nit standard.

Pull-Request: #549
Reviewed-by: Lucas Bajolet <r4pass@hotmail.com>
Reviewed-by: Jean Privat <jean@pryen.org>
Reviewed-by: Alexandre Terrasa <alexandre@moz-code.org>
Merge: tests: move the check of exec.skip to detect compilation error

Pull-Request: #567
Reviewed-by: Alexandre Terrasa <alexandre@moz-code.org>