[Improve base View][4/n] Write tests for geometry.js

[taneliang]

Stack PR by STACK ATTACK:

• 99 [Improve base View][1/n] Add subview handling to View

• 100 [Improve base View][2/n] Rationalize view layout system

• 101 [Improve base View][3/n] Add _ to views' private vars and methods

• #102 [Improve base View][4/n] Write tests for geometry.js

Works towards #86.

Test Plan

• yarn test: all new tests pass. 100% coverage of geometry.js.
• yarn lint
• yarn flow: no change in errors (test file isn't covered by Flow anyway)

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