test(Toast): add tests

[booc0mtaco]

Test Plan:

• Wrote automated tests
• CI tests / new tests are not applicable
• Manually tested my changes, but I want to keep the details secret
• Created and used an alpha publish
• Manually tested my changes, and here are the details:

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.73%. Comparing base (48e92d4) to head (b45d578).

Additional details and impacted files

@@                  Coverage Diff                   @@
##           v15-components-2.0    #1939      +/-   ##
======================================================
+ Coverage               96.56%   96.73%   +0.17%     
======================================================
  Files                     133      133              
  Lines                    3403     3403              
  Branches                  915      915              
======================================================
+ Hits                     3286     3292       +6     
+ Misses                    114      108       -6     
  Partials                    3        3              

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