19 lines
575 B
TypeScript
19 lines
575 B
TypeScript
import { computeDelta } from '../src/billing/stripe';
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describe('computeDelta', () => {
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it('returns the difference when billable exceeds prior', () => {
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expect(computeDelta(800, 500)).toBe(300);
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});
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it('returns 0 when billable equals prior', () => {
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expect(computeDelta(500, 500)).toBe(0);
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});
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it('never returns a negative value when billable is below prior', () => {
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expect(computeDelta(300, 500)).toBe(0);
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});
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it('returns the full billable amount when nothing was reported before', () => {
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expect(computeDelta(500, 0)).toBe(500);
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});
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});
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