Change symbols to primitive classes in backend test

[Seth-Rothschild]

Change the condition to enter the if blocks in a backend test.

[codecov-io]

Codecov Report

Merging #144 into master will increase coverage by 0.3%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master     #144     +/-   ##
=========================================
+ Coverage   91.19%   91.49%   +0.3%     
=========================================
  Files          73       73             
  Lines        7764     7764             
=========================================
+ Hits         7080     7104     +24     
+ Misses        684      660     -24

Impacted Files	Coverage Δ
...tests/computational_backend/test_pandas_backend.py	100% <100%> (+10.66%)	⬆️

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[kmax12]

Merging