On Wednesday, 21 January 2026 at 16:32:26 UTC, Brother Bill wrote:
My question is why isn't the unittest passing it?
I tested the code you provided.
```d
import std;
class UnequalLengths : Exception
{
this(string msg, string file = __FILE__, size_t line = __LINE__)
{
super(msg, file, line);
writeln("Unequal lengths");
}
}
class RangeError : Exception
{
this(string msg, string file = __FILE__, size_t line = __LINE__)
{
super(msg, file, line);
writeln("Range error");
}
}
int[] average(int[] a, int[] b)
{
int[] average;
if (a.length != b.length)
throw new UnequalLengths("Unequal lengths");
return average;
}
unittest
{
assertThrown!UnequalLengths(average([1], [1, 2]));
assertNotThrown!RangeError(average([], []));
}
```
I compiled the application with the following compiler options.
```bash
dmd -unittest -main
```
The unit tests seem to be successful.
```bash
Unequal lengths
1 modules passed unittests
```
