Test mamba class to python class

[JSAbrahams]

Relevant issues

Start of #32

Summary

Add a smoke test to check the generated Python file. We ignore the test for now until we have more complex desugaring rules, such as:

• Detecting whether something is a field or function
• Returning the value of a function explicitly in Python if this is the intended behaviour
• Combining Stateful and Stateless classes (and explicitly adding self argument if stateless)
• Use pattern matching for arguments with default arguments (i.e. my_function (0) => ...)

Added Tests

Test to check output of mamba class. This test, however, is ignored for now.

Additional Context

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[codecov[bot]]

Codecov Report

Merging #61 into master will increase coverage by 0.27%. The diff coverage is 68.75%.

@@           Coverage Diff            @@
##           master    #61      +/-   ##
========================================
+ Coverage   79.72%    80%   +0.27%     
========================================
  Files          57     58       +1     
  Lines        3847   3850       +3     
========================================
+ Hits         3067   3080      +13     
+ Misses        780    770      -10

Impacted Files	Coverage Δ
tests/main.rs	93.75% <ø> (ø)	:arrow_up:
src/core/construct.rs	18.55% <ø> (ø)	:arrow_up:
src/desugar/node.rs	69.51% <0%> (ø)	:arrow_up:
src/core/mod.rs	64.1% <100%> (+2.31%)	:arrow_up:
src/parser/definition.rs	82.43% <100%> (+6.5%)	:arrow_up:
tests/command.rs	85.36% <100%> (ø)	:arrow_up:
tests/parser/valid/definition.rs	89.55% <100%> (+0.05%)	:arrow_up:
src/desugar/definition.rs	80% <100%> (ø)	:arrow_up:
tests/desugar/definition.rs	88% <100%> (ø)	:arrow_up:
src/parser/file.rs	86.48% <100%> (+2.13%)	:arrow_up:
... and 6 more

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