ZEVA - Task write unit tests for compliance reductions/calculations/ratios

[emi-hi]

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Describe the task
write tests that ensure that in any given year the correct reductions are applied based on the compliance ratios

Purpose
confidence in our product

Additional context
Write tests that check for both large and small suppliers (eg large suppliers would need to meet the zev class A amount as well as the overall amount)

write tests to try different years