test: add testFail JS integration test

[agostbiro]

I originally added just a Rust unit test in #648 to make sure testFail is off by default when Solidity tests are ran through the JS interface. But that unit test failed to build on Ubuntu as the linker tried to link Node symbols into it for some reason. So I scrapped that Rust unit test and added JS integration tests here to make sure testFail is off by default.

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[Wodann]

LGTM!

A question: Was the linker error by any chance similar to this one?

[agostbiro]

A question: Was the linker error by any chance similar to this one?

Yeah similar error. I didn't manage to resolve it in reasonable time.