[stratis-devel] `real_test_empty_pool` test fails

[Jacob Salzberg]

Hello Stratis developers!

I attempted to run the `make test-real` on a virtual machine of Fedora
26-1.5 Server. One of the tests failed, and I'm wondering if that is
important enough to post as an issue.

To be more specific, when I try to run `real_test_empty_pool,` it fails at
one of the `unwrap()`s:
> make test-real
> sudo env
> "PATH=/usr/local/bin:/usr/bin:/usr/local/sbin:/usr/sbin:/home/jsalzberg/.cargo/bin:/home/jsalzberg/Programming/stratisd/target/debug:/home/jsalzberg/.local/bin:/home/jsalzberg/bin"
> RUSTFLAGS='-D warnings' RUST_BACKTRACE=1 cargo test -- --test
> real_test_empty_pool
>    Compiling libstratis v0.1.1
> (file:///home/jsalzberg/Programming/stratisd)
>     Finished dev [unoptimized + debuginfo] target(s) in 4.55 secs
>      Running target/debug/deps/libstratis-a40f09f70f597433
>
> running 0 tests
>
> test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 56 filtered out
>  Running target/debug/deps/stratisd-29c4deddc9023466
>
> running 0 tests
>
> test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
>  Running target/debug/deps/loopbacked_tests-3d242529a0f13830
>
> running 0 tests
>
> test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 17 filtered out
>  Running target/debug/deps/real_tests-aea58de6898d93b0
>
> running 1 test
> test real_test_empty_pool ... FAILED
>
> failures:
>
> ---- real_test_empty_pool stdout ----
>     thread 'real_test_empty_pool' panicked at 'called `Result::unwrap()`
> on an `Err` value: Error { repr: Os { code: 2, message: "No such file or
> directory" } }', src/libcore/result.rs:860:4
> note: Some details are omitted, run with `RUST_BACKTRACE=full` for a
> verbose backtrace.
> stack backtrace:
>    0: std::sys::imp::backtrace::tracing::imp::unwind_backtrace
>    1: std::sys_common::backtrace::_print
>    2: std::panicking::default_hook::{{closure}}
>    3: std::panicking::default_hook
>    4: std::panicking::rust_panic_with_hook
>    5: std::panicking::begin_panic_new
>    6: std::panicking::begin_panic_fmt
>    7: rust_begin_unwind
>    8: core::panicking::panic_fmt
>    9: core::result::unwrap_failed
>              at /builddir/build/BUILD/rustc-1.20.0-src/src/libcore/
> macros.rs:41
>   10: <core::result::Result<T, E>>::unwrap
>              at /builddir/build/BUILD/rustc-1.20.0-src/src/libcore/
> result.rs:738
>   11: real_tests::test_with_spec
>              at tests/real_tests.rs:116
>   12: real_tests::real_test_empty_pool
>              at tests/real_tests.rs:196
>   13: <F as test::FnBox<T>>::call_box
>   14: __rust_maybe_catch_panic
>
> failures:
>     real_test_empty_pool
>
> test result: FAILED. 0 passed; 1 failed; 0 ignored; 0 measured; 16
> filtered out

PS: That test is written with a lot of `unwrap()`s, and it is hard to tell
which of the `unwrap()`s causes the error. Should they all be changed to
`expect("")`s?