Flashcard test

[ybfe1853]

Short description of what this resolves:

Add test cases for flashcard functionality

Changes proposed in this pull request:

-Addition of test cases for flashcard
-Re obtain reference to selected set in select_set function and set_status function to account for the possibility of set creation for the first time
-add else clause to set status to account for possibility of no cards being created for a particular set

Fixes: #71

[codecov-io]

Codecov Report

Merging #109 into master will increase coverage by 6.17%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master    #109      +/-   ##
=========================================
+ Coverage   65.63%   71.8%   +6.17%     
=========================================
  Files          30      30              
  Lines        1673    1706      +33     
=========================================
+ Hits         1098    1225     +127     
+ Misses        575     481      -94

Impacted Files	Coverage Δ
tests/learn/test_flashcards.py	100% <100%> (ø)	⬆️
modules/learn.py	62.54% <100%> (+28.21%)	⬆️
modules/util.py	72.22% <0%> (+11.11%)	⬆️

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[manparvesh]

@ybfe1853 this looks great! I'm merging this. Thanks for contributing! 😄