deviceshifu lwm2m unit test

[beingStrongeryqqq]

What this PR does / why we need it:
add deviceshifu lwm2m unit test
Will this PR make the community happier?
yes
Which issue this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged): fixes #

How is this PR tested

• unit test
• e2e test
• other (please specify)

Special notes for your reviewer:

Release note:

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 34.18%. Comparing base (db47f77) to head (a94d1de).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1051      +/-   ##
==========================================
+ Coverage   33.43%   34.18%   +0.74%     
==========================================
  Files          55       55              
  Lines        4806     4806              
==========================================
+ Hits         1607     1643      +36     
+ Misses       3059     3023      -36     
  Partials      140      140              

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