Szathmáry László honlapja @ DEIK

Success

(1) success

import std.stdio;

int add(const int a, const int b) pure
{
return a + b;
}

void main()
{
int result = add(2, 3);
writeln(result); // 5
}

// You can add as many unittests as you want. Here we write just one.
unittest
{
assert(add(2, 5) == 7);
}

Run the program (ignoring the unittests):

$ dmd main.d
$ ./main
5

$ rdmd main.d
5

Run just the unittests:

$ dmd -unittest main.d
$ ./main
1 modules passed unittests

$ rdmd -unittest main.d
1 modules passed unittests

Failure

Change the unittest:

(2) failure

...
unittest
{
assert(add(2, 5) == 99);
}

Run the program (ignoring the unittests):

$ dmd main.d
$ ./main
5

$ rdmd main.d
5

Run just the unittests:

$ dmd -unittest main.d
$ ./main
main.d(20): [unittest] unittest failure
1/1 modules FAILED unittests

$ rdmd -unittest main.d
main.d(20): [unittest] unittest failure
1/1 modules FAILED unittests

Test a library

If you have a library, then the library has no main() function. In this case, add the -main switch, and the D compiler will add an empty main() function during the compliation. Otherwise, you'd get an error that main() is missing.

$ dmd -unittest main.d
/usr/bin/ld: /usr/lib/gcc/x86_64-pc-linux-gnu/15.2.1/../../../../lib/Scrt1.o: in function `_start':
(.text+0x1b): undefined reference to `main'

$ dmd -unittest -main main.d
$ ./main
1 modules passed unittests


$ rdmd -unittest main.d
/usr/bin/ld: /usr/lib/gcc/x86_64-pc-linux-gnu/15.2.1/../../../../lib/Scrt1.o: in function `_start':
(.text+0x1b): undefined reference to `main'

$ rdmd -unittest -main main.d
1 modules passed unittests

Unit tests

Success

Failure

Test a library