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

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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