Il giorno domenica 6 maggio 2018 06:35:08 UTC+2, Mirko Friedenhagen ha scritto: > > Hello, > > I am trying out golang and like it's concepts (coming from Python and Java > mostly, not having Exceptions felt a bit strange at the start, though :-)). > > * Now I try to write tests for > https://github.com/caradojo/trivia/blob/master/go/trivia.go for the fun > of it. > * I want to do this without modifying the code (too much). > * I already introduced my own fake[1] random and now need to replace > os.Stdout with a fake implementation as the results of the game implemented > here are written with `fmt.Println` resp. `fmt.Printf`. > * My first approach was to use a tempfile[2], this works but I do not like > to touch the disk during tests. > * In Java `System.out` is just a `PrintStream` which is easily replaced by > sth. like `System.setOut(new PrintStream(new ByteArrayOutputStream()));` > * Now in golang `os.Stdout` is an `*os.File` which is mostly a wrapper for > an OS specific file. >
For your example code the solution is simple: don't use fmt.Printf, but use fmt.Fprintf that accepts an io.Writer instead. Pass the writer as the function argument. You can also use the log package, but I personally use it *only* to report (handled) errors to the terminal or to the log file. > [...] Manlio -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
