On Thu, Nov 03, 2022 at 08:51:52AM -0700, Ali Çehreli via Digitalmars-d-learn
wrote:
> On 11/3/22 03:00, Bruno Pagis wrote:
>
> > void print() {
> > writeln("array = ", this.array);
> > }
>
> Similar to Paul Backus's program but I would try to avoid the file system
> for unit tests when possible. In this case, you can print into a sink, which
> can be useful in other ways as well:
[...]
Alternatively, you can templatize on File to make it swappable with a
mock object:
void myfunc(File = std.stdio.File)(File output = stdout) {
output.writeln(...);
}
unittest {
struct MockFile {
string output;
void writeln(Args...)(Args args) {
output ~= format(args);
}
}
MockFile mock;
myfunc(mock);
assert(mock.output == ...);
}
T
--
"Maybe" is a strange word. When mom or dad says it it means "yes", but when my
big brothers say it it means "no"! -- PJ jr.
