Test desugar stage

[JSAbrahams]

Relevant issues

There were no tests for the desugar stage. It is nice to test this directly however to make sure we desugar as we intended.

Summary

Add tests for the desugar stage.

• Uncover bug where neq was desugared as not and eq instead of existing Core neq node.

Added Tests

• Tests for desugaring operations
• Tests for desugaring collections
• Tests for desugaring primitives (indirectly)
• Tests for desugaring simple statements and expressions (such as print)

Additional Context

...

[codecov[bot]]

Codecov Report

Merging #58 into master will increase coverage by 2.83%. The diff coverage is 87.04%.

@@            Coverage Diff             @@
##           master      #58      +/-   ##
==========================================
+ Coverage   77.26%   80.09%   +2.83%     
==========================================
  Files          48       57       +9     
  Lines        3347     3788     +441     
==========================================
+ Hits         2586     3034     +448     
+ Misses        761      754       -7

Impacted Files	Coverage Δ
tests/core/collection.rs	75% <ø> (ø)	:arrow_up:
src/lib.rs	0% <ø> (ø)	:arrow_up:
tests/core/control_flow.rs	75% <ø> (ø)	:arrow_up:
tests/core/function.rs	66.66% <ø> (ø)	:arrow_up:
src/desugar/mod.rs	100% <ø> (ø)
tests/core/class.rs	100% <ø> (ø)	:arrow_up:
tests/main.rs	75% <ø> (ø)	:arrow_up:
tests/core/compound.rs	100% <ø> (ø)	:arrow_up:
src/command/mod.rs	79.16% <ø> (ø)	:arrow_up:
src/parser/ast.rs	26.05% <0%> (ø)	:arrow_up:
... and 30 more

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