Add AlignedWordPair test for consistency with machine.py

[Enkidu93]

For consistency with sillsdev/machine.py#164

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This change is 

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 70.46%. Comparing base (c5fa125) to head (4b971a0).
⚠️ Report is 79 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #297   +/-   ##
=======================================
  Coverage   70.46%   70.46%           
=======================================
  Files         386      386           
  Lines       32256    32256           
  Branches     4539     4539           
=======================================
  Hits        22729    22729           
  Misses       8479     8479           
  Partials     1048     1048           

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[ddaspit]

Reviewed 1 of 1 files at r1, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @isaac091 and @johnml1135)