Test AST's of test output

[JSAbrahams]

Relevant issues

Fixes #122

Summary

Add tests to check that output ast is what we expect it to be.

• Fix not desugaring imports of file

• Remove multi-expressions from control flow, was more trouble than its worth

• Add raise construct to language, and raise token

• Fix not a desugaring overflow of pow operator, or ** or __pow__ in Python

• Always newline in control flow or function to prevent non-parsable Python code, such as broken if statements

• Fix not desugaring statement or expression contained in raises

• [x] Add Floordiv to core and add a test for floordiv when #115 is merged.

Added Tests

List tests here once done

[codecov[bot]]

Codecov Report

Merging #123 into master will increase coverage by 0.88%. The diff coverage is 83.1%.

@@            Coverage Diff             @@
##           master     #123      +/-   ##
==========================================
+ Coverage   82.54%   83.42%   +0.88%     
==========================================
  Files          65       70       +5     
  Lines        4565     4755     +190     
==========================================
+ Hits         3768     3967     +199     
+ Misses        797      788       -9

Impacted Files	Coverage Δ
src/parser/expr_or_stmt.rs	100% <ø> (ø)	:arrow_up:
src/parser/ast.rs	28.3% <0%> (+2.35%)	:arrow_up:
src/core/construct.rs	27.41% <0%> (-0.23%)	:arrow_down:
tests/parser/valid/control_flow.rs	84.44% <100%> (-0.78%)	:arrow_down:
src/lexer/mod.rs	97.09% <100%> (+0.01%)	:arrow_up:
src/desugar/control_flow.rs	78.12% <100%> (ø)	:arrow_up:
tests/main.rs	100% <100%> (ø)	:arrow_up:
tests/core/compound.rs	100% <100%> (ø)	:arrow_up:
tests/parser/mod.rs	100% <100%> (ø)	:arrow_up:
tests/parser/valid/compound.rs	100% <100%> (ø)	:arrow_up:
... and 38 more

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[JSAbrahams]

This PR is kind of on the large side, but I was a bit too lazy to split this up into smaller PR's.