add failed test

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❌ 1 Tests Failed:

Tests completed	Failed	Passed	Skipped
6	1	5	0

View the top 1 failed test(s) by shortest run time

app/utils/mathUtils.test.js > cube2 function

Stack Traces | 0.008s run time

AssertionError: expected 8 to be 3 // Object.is equality

- Expected
+ Received

- 3
+ 8

 ❯ app/utils/mathUtils.test.js:15:19

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