Added tests for snapshot() behaviour with global keyword

[shirleyyzhang]

Proposed Changes

• This PR increases test coverage for the snapshot() function for usages of the global keyword.
• The added tests check that current the behavior is correct for reading, assigning, shadowing and nested scope cases

Screenshots of your changes (if applicable)

Type of Change

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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)
♻️ 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)

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[coveralls]

Pull Request Test Coverage Report for Build 23832164429

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 89.987%

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Totals
Change from base Build 23057700087:	0.0%
Covered Lines:	3478
Relevant Lines:	3865

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💛 - Coveralls

[david-yz-liu]

Revert the changes in this file

[david-yz-liu]

Nice work, @shirleyyzhang!