I think this line should also state how many resulted in errors. A quick glance (or if you were to grep for this line) could make the situation look better than it is. In the example output that you posted, just reading that line makes it seem like 5/6 scripts tested did fine. I'd rather the current output:

```
Ran 4 commands to test 6 scripts. 1 of these commands failed.
```

say something like:
```
Ran 4 commands to test 6 scripts. 6 of these commands failed or could not be tested due to errors.
```

or:
```
Ran 4 commands to test 6 scripts. 1 of these commands failed and 5 could not be tested due to errors.
```