test: test for `process.argv[0]` correctness
test: test for `process.argv[0]` correctness

joyent/node@b0c15412270f32e00c268c578f07a1ed032323f5 introduced a
regression causing `process.argv[0]` to be invalid in node processes
spawned from `PATH` (without explicit path to executable file - for
example when using global node installation).

Instead of finding a correct path to the executable, `process.cwd()`
would be prepended to `process.argv[0]`.

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