Can't get dub dustmite to work

[aliak]

Trying to get dub dustmite to work, but I keep getting "initial 
test fails"

This is the error from a vanilla dub test:

```
result ~wip: building configuration "result-test-unittest"...
inout(SumType!(int, FailureContainer))
../../.dub/packages/sumtype-0.9.4/sumtype/src/sumtype.d(1322,4): 
Error: static assert:  "handler #1 of type Optional!(Exception) 
function(FailureContainer container) pure nothrow @nogc @safe 
never matches"
../../.dub/packages/sumtype-0.9.4/sumtype/src/sumtype.d(1165,14): 
        instantiated from here: matchImpl!(inout(SumType!(int, 
FailureContainer)))
source/result/result.d(136,20):        instantiated from here: 
match!(inout(SumType!(int, FailureContainer)))
tests/result.d(20,20):        instantiated from here: 
Result!(int, Exception)
dmd failed with exit code 1.
```

Then I run this dub dustmite command:

dub dustmite -b unittest ../dubdust --compiler-regex="never 
matches"

And I get:

```
...
Loading /Users/aliak/dev/dubdust/vibe-d/web/vibe/web/web.d
None => No
Hint: use --no-redirect to see test script output
Hint: read 
https://github.com/CyberShadow/DustMite/wiki#initial-test-fails
object.Exception at DustMite/dustmite.d(295): Initial test fails: 
Test script "/usr/local/Cellar/dub/1.20.0/bin/dub dustmite 
--vquiet --test-package=result --build=unittest --config=library 
\"--compiler=dmd\" \"--compiler-regex=never matches\"" exited 
with exit code 3 (failure)
```

* --no-redirect doesn't work in dub dustmite.
* I tried adding --compiler-status=1 with the same result
* I tired --combined with the same result

My dub.json for the unittest configuration is (incase that 
matters):
         {
             "name": "unittest",
             "importPaths": [
                 "./tests"
             ],
             "sourcePaths": [
                 "./tests"
             ]
         },

Thanks for any help!