tests are broken/timeout

[craftyguy]

 * Nemo version (nemo --version): git master
 * Is issue with desktop or windowed nemo?: n/a
 * Distribution - (Mint 17.2, Arch, Fedora 25, etc...): Alpine Linux, Arch Linux
 * Graphics hardware *and* driver used: Mali and Intel graphics, Mesa 20.1.5
 * 32 or 64 bit: amd64 and aarch64

Issue
Tests are broken, and/or timeout:

❯ meson test

...
2/4 Search Engine test   TIMEOUT        30.01s

--- command ---
18:52:27 /tmp/nemo/output/test/test-nemo-search-engine
-------

3/4 Directory Async test TIMEOUT        30.01s

--- command ---
18:52:27 /tmp/nemo/output/test/test-nemo-directory-async
-------

4/4 Copy test            FAIL           0.07s (exit status 1)

--- command ---
18:52:27 /tmp/nemo/output/test/test-nemo-copy
--- stdout ---
Usage test-copy <sources...> <dest dir>
-------


Ok:                 1
Expected Fail:      0
Fail:               1
Unexpected Pass:    0
Skipped:            0
Timeout:            2

The test-nemo-copy test is missing arguments in meson.build. When arguments are supplied, it hangs indefinitely.

Output from strace where it's hanging/polling continuously:

ppoll([{fd=3, events=POLLIN}, {fd=4, events=POLLIN}, {fd=6, events=POLLIN}], 3, {tv_sec=4, tv_nsec=990000000}, NULL, 8) = 0 (Timeout)
clock_gettime(CLOCK_MONOTONIC, {tv_sec=47335, tv_nsec=6466169}) = 0
futex(0xffff82d5dbe0, FUTEX_WAKE_PRIVATE, 1) = 1
futex(0xffff82d5dbd0, FUTEX_WAKE_PRIVATE, 1) = 1
futex(0xffff82d5db80, FUTEX_WAKE_PRIVATE, 1) = 1
clock_gettime(CLOCK_MONOTONIC, {tv_sec=47335, tv_nsec=7333302}) = 0
futex(0xffff83414d90, FUTEX_WAKE_PRIVATE, 1) = 1
recvmsg(3, {msg_namelen=0}, 0)          = -1 EAGAIN (Resource temporarily unavailable)
recvmsg(3, {msg_namelen=0}, 0)          = -1 EAGAIN (Resource temporarily unavailable)
ppoll([{fd=3, events=POLLIN}, {fd=4, events=POLLIN}, {fd=6, events=POLLIN}], 3, {tv_sec=0, tv_nsec=0}, NULL, 8) = 1 ([{fd=4, revents=POLLIN}], left {tv_sec=0, tv_nsec=0})
read(4, "\1\0\0\0\0\0\0\0", 16)         = 8
clock_gettime(CLOCK_MONOTONIC, {tv_sec=47335, tv_nsec=8925981}) = 0
clock_gettime(CLOCK_MONOTONIC, {tv_sec=47335, tv_nsec=9210067}) = 0
recvmsg(3, {msg_namelen=0}, 0)          = -1 EAGAIN (Resource temporarily unavailable)
recvmsg(3, {msg_namelen=0}, 0)          = -1 EAGAIN (Resource temporarily unavailable)
ppoll([{fd=3, events=POLLIN}, {fd=4, events=POLLIN}, {fd=6, events=POLLIN}], 3, {tv_sec=4, tv_nsec=991000000}, NULL, 8) = 0 (Timeout)
clock_gettime(CLOCK_MONOTONIC, {tv_sec=47340, tv_nsec=6564202}) = 0
futex(0xffff82d5dbe0, FUTEX_WAKE_PRIVATE, 1) = 1
futex(0xffff82d5dbd0, FUTEX_WAKE_PRIVATE, 1) = 1
futex(0xffff82d5db80, FUTEX_WAKE_PRIVATE, 1) = 1
futex(0xffff83414d90, FUTEX_WAKE_PRIVATE, 1) = 0
clock_gettime(CLOCK_MONOTONIC, {tv_sec=47340, tv_nsec=7856546}) = 0
recvmsg(3, {msg_namelen=0}, 0)          = -1 EAGAIN (Resource temporarily unavailable)
recvmsg(3, {msg_namelen=0}, 0)          = -1 EAGAIN (Resource temporarily unavailable)
ppoll([{fd=3, events=POLLIN}, {fd=4, events=POLLIN}, {fd=6, events=POLLIN}], 3, {tv_sec=0, tv_nsec=0}, NULL, 8) = 1 ([{fd=4, revents=POLLIN}], left {tv_sec=0, tv_nsec=0})
read(4, "\1\0\0\0\0\0\0\0", 16)         = 8
clock_gettime(CLOCK_MONOTONIC, {tv_sec=47340, tv_nsec=9823562}) = 0
clock_gettime(CLOCK_MONOTONIC, {tv_sec=47340, tv_nsec=10118148}) = 0
recvmsg(3, {msg_namelen=0}, 0)          = -1 EAGAIN (Resource temporarily unavailable)
recvmsg(3, {msg_namelen=0}, 0)          = -1 EAGAIN (Resource temporarily unavailable)

The search engine and directory async tests report 'finish' in the log but timeout. I'm not sure why they don't return/complete.

Steps to reproduce

Build tests, and run with meson test

Expected behaviour

Tests finish and pass.

Other information