spec: add check for assignments link in left nav
spec: add check for assignments link in left nav

Test Plan:
- pass Jenkins
- check for syntax errors
- make sure new test_ids match up to an existing test case in TestRails

ataniuchi,panda,1
Change-Id: I776266796918028d050d121277e5c2f7cb3a2178
Reviewed-on: https://gerrit.instructure.com/61207
Tested-by: Jenkins
Reviewed-by: Matt Fairbourn <5f353e1c97bb9cc046b9db20beca0b9392f6f1b2@instructure.com>
Product-Review: Matt Fairbourn <5f353e1c97bb9cc046b9db20beca0b9392f6f1b2@instructure.com>
QA-Review: Matt Fairbourn <5f353e1c97bb9cc046b9db20beca0b9392f6f1b2@instructure.com>

AndranikMarkosyan/lms,SwinburneOnline/canvas-lms,dgynn/canvas-lms,sfu/canvas-lms,matematikk-mooc/canvas-lms,instructure/canvas-lms,grahamb/canvas-lms,roxolan/canvas-lms,venturehive/canvas-lms,HotChalk/canvas-lms,narigone/canvas,matematikk-mooc/canvas-lms,kyroskoh/canvas-lms,leftplusrightllc/canvas-lms,jay3126/canvas-lms,venturehive/canvas-lms,leftplusrightllc/canvas-lms,snehakachroo1/LSI_replica,instructure/canvas-lms,leftplusrightllc/canvas-lms,djbender/canvas-lms,redconfetti/canvas-lms,instructure/canvas-lms,fronteerio/canvas-lms,roxolan/canvas-lms,venturehive/canvas-lms,sfu/canvas-lms,snehakachroo1/LSI_replica,redconfetti/canvas-lms,matematikk-mooc/canvas-lms,HotChalk/canvas-lms,narigone/canvas,dgynn/canvas-lms,jay3126/canvas-lms,grahamb/canvas-lms,sfu/canvas-lms,SwinburneOnline/canvas-lms,grahamb/canvas-lms,SwinburneOnline/canvas-lms,kyroskoh/canvas-lms,venturehive/canvas-lms,AndranikMarkosyan/lms,AndranikMarkosyan/lms,djbender/canvas-lms,leftplusrightllc/canvas-lms,sfu/canvas-lms,instructure/canvas-lms,fronteerio/canvas-lms,narigone/canvas,jay3126/canvas-lms,sfu/canvas-lms,redconfetti/canvas-lms,SwinburneOnline/canvas-lms,roxolan/canvas-lms,djbender/canvas-lms,instructure/canvas-lms,HotChalk/canvas-lms,fronteerio/canvas-lms,sfu/canvas-lms,kyroskoh/canvas-lms,matematikk-mooc/canvas-lms,snehakachroo1/LSI_replica,narigone/canvas,grahamb/canvas-lms,sfu/canvas-lms,kyroskoh/canvas-lms,dgynn/canvas-lms,roxolan/canvas-lms,dgynn/canvas-lms,redconfetti/canvas-lms,grahamb/canvas-lms,HotChalk/canvas-lms,fronteerio/canvas-lms,instructure/canvas-lms,jay3126/canvas-lms,snehakachroo1/LSI_replica,instructure/canvas-lms,djbender/canvas-lms,AndranikMarkosyan/lms