Prior, tests would all fail to build, causing, roughly, the following error (roughly, because I added some debug log messages :)):

ok 68 - Evaluating jobs/build-products.nix should result in 2 builds
Queue runner stderr: using 4185024512 bytes for the NAR buffer
locking path '/build/source/tests/data/queue-runner/lock'
lock acquired on '/build/source/tests/data/queue-runner/lock.lock'
warning: unknown setting 'max-connection-age'
warning: unknown setting 'max-connections'
dispatcher woken up
dispatcher woken up
dispatcher sleeping for 7674380800s
adding new machine ‘localhost’
dispatcher woken up
checking the queue for builds > 0...
dispatcher sleeping for 7674380800s
sending notification about build 1
loading build 18 (tests:build-products:simple)
considering derivation ‘/build/source/tests/nix/store/24h0i450d4k00a4jhhk6r7qpqdvzskw6-build-product-simple.drv’
sending notification about build 2
creating build step ‘/build/source/tests/nix/store/24h0i450d4k00a4jhhk6r7qpqdvzskw6-build-product-simple.drv’
added build 18 (top-level step /build/source/tests/nix/store/24h0i450d4k00a4jhhk6r7qpqdvzskw6-build-product-simple.drv, 1 new steps)
got 1 new runnable steps from 1 new builds
step ‘/build/source/tests/nix/store/24h0i450d4k00a4jhhk6r7qpqdvzskw6-build-product-simple.drv’ is now runnable
dispatcher woken up
dispatcher sleeping for 7674380800s
performing step ‘/build/source/tests/nix/store/24h0i450d4k00a4jhhk6r7qpqdvzskw6-build-product-simple.drv’ 1 times on ‘localhost’ (needed by build 18
and 0 others)
sending closure of ‘/build/source/tests/nix/store/24h0i450d4k00a4jhhk6r7qpqdvzskw6-build-product-simple.drv’ to ‘localhost’
building ‘/build/source/tests/nix/store/24h0i450d4k00a4jhhk6r7qpqdvzskw6-build-product-simple.drv’ on ‘localhost’
killing process 10462
marking build 18 as failed
finishing build step ‘/build/source/tests/nix/store/24h0i450d4k00a4jhhk6r7qpqdvzskw6-build-product-simple.drv’

ok 69 - Build 'simple' from jobs/build-products.nix should exit with code 0
ok 70 - newbuild->finished was '1' instead of 1
not ok 71 - newbuild->buildstatus was '1' instead of 0
not ok 72 - Build 'simple' from jobs/build-products.nix should have buildstatus 0
Can't call method "name" on an undefined value at ./evaluation-tests.pl line 173.
FAIL: evaluation-tests.pl