npm / cli / #2759

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fix(tests): move more tests to use real npm

This moves a handful of the smaller tests to using the new npm mock that
uses the real actual npm object.  It also extends the testing surface
area of a few tests back down into the actual `process.spawn` that
results, instead of anything internal to the code.

Some dead code in `lib/test.js` was found during this, as well as an
instance of a module throwing a string instead of an error object.

3190 of 3279 branches covered (97.29%)

Branch coverage included in aggregate %.

1 of 1 new or added line in 1 file covered. (100.0%)

5425 of 5568 relevant lines covered (97.43%)

27.96 hits per line