Fix assert_if and add tests

[yamaguchi1024]

assert_if didn't have any test before this and was causing errors in BLAS schedules

[codecov-commenter]

Codecov Report

Merging #338 (aaea9dc) into master (0a1079f) will increase coverage by 0.11%.
The diff coverage is 81.25%.

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@@            Coverage Diff             @@
##           master     #338      +/-   ##
==========================================
+ Coverage   86.82%   86.94%   +0.11%     
==========================================
  Files          76       76              
  Lines       17143    17155      +12     
==========================================
+ Hits        14885    14915      +30     
+ Misses       2258     2240      -18     

Impacted Files	Coverage Δ
src/exo/LoopIR_scheduling.py	91.62% <75.00%> (+0.68%)	⬆️
tests/test_schedules.py	99.17% <100.00%> (+<0.01%)	⬆️
tests/test_x86.py	99.04% <0.00%> (-0.96%)	⬇️
src/exo/API_scheduling.py	87.89% <0.00%> (+0.82%)	⬆️

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[alexreinking]

@yamaguchi1024 - you need to push again

[yamaguchi1024]

@alexreinking ah, thanks!