test(e2e): add specs to hint for pulling unnamed layers

[qweeah]

What this PR does / why we need it:
This PR adds specs to hint for pulling unnamed layers

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #1173

Please check the following list:

• Does the affected code have corresponding tests, e.g. unit test, E2E test?
• Does this change require a documentation update?
• Does this introduce breaking changes that would require an announcement or bumping the major version?
• Do all new files have an appropriate license header?

[codecov-commenter]

Codecov Report

Merging #1174 (079d8f1) into main (dbf40e4) will increase coverage by 0.08%.
The diff coverage is n/a.

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@@            Coverage Diff             @@
##             main    #1174      +/-   ##
==========================================
+ Coverage   79.94%   80.02%   +0.08%     
==========================================
  Files          65       65              
  Lines        3560     3560              
==========================================
+ Hits         2846     2849       +3     
+ Misses        497      495       -2     
+ Partials      217      216       -1     

see 1 file with indirect coverage changes

[shizhMSFT]

LGTM