Draw function test cases (data types and manual layout)

[sarahsonder]

Proposed Changes

Added tests for the draw function, covering data types and manual layouts.

Previously, there was only one general snapshot test. The purpose of this PR is to write tests that check for more specific behaviours.

Type of Change

Type	Applies?
🚨 Breaking change (fix or feature that would cause existing functionality to change)
✨ New feature (non-breaking change that adds functionality)
🐛 Bug fix (non-breaking change that fixes an issue)
🎨 User interface change (change to user interface; provide screenshots)
♻️ Refactoring (internal change to codebase, without changing functionality)
🚦 Test update (change that only adds or modifies tests)	X
📚 Documentation update (change that only updates documentation)
📦 Dependency update (change that updates a dependency)
🔧 Internal (change that only affects developers or continuous integration)

Checklist

Before opening your pull request:

• I have performed a self-review of my changes.
  • Check that all changed files included in this pull request are intentional changes.
  • Check that all changes are relevant to the purpose of this pull request, as described above.
• I have added tests for my changes, if applicable.
  • This is required for all bug fixes and new features.
• If this is my first contribution, I have added myself to the list of contributors.
• I have updated the project Changelog (this is required for all changes).

After opening your pull request:

• I have verified that the CI tests have passed.
• I have reviewed the test coverage changes reported by Coveralls.
• I have requested a review from a project maintainer.

Questions and Comments

Yoonie will be covering automatic layouts and custom styling!

[coveralls]

Pull Request Test Coverage Report for Build 9164741035

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+25.4%) to 84.759%

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Totals
Change from base Build 9164734129:	25.4%
Covered Lines:	376
Relevant Lines:	423

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💛 - Coveralls

[david-yz-liu]

@sarahsonder great work! In addition to the inline comments I left, please add test cases for empty collections (list/tuple/set/dict).