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feat: tiered pricing engine with edge case tests (Issue #1) #70

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feat: tiered pricing engine with edge case tests (Issue #1) #70

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36 changes: 36 additions & 0 deletions tests/pricing.test.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -29,3 +29,39 @@ Deno.test('Batch cost calculation', () => {
// 1 standard call
assertEquals(calculateBatchCost(51, 1), 0.01);
});


Deno.test('Edge: zero calls returns free tier', () => {
assertEquals(getTierPrice(0).tier, 'free');
assertEquals(getTierPrice(0).pricePerCall, 0.00);
});

Deno.test('Edge: large call count still returns premium', () => {
assertEquals(getTierPrice(1000000).tier, 'premium');
assertEquals(getTierPrice(1000000).pricePerCall, 0.03);
});

Deno.test('Edge: negative call count defaults to free', () => {
assertEquals(getTierPrice(-1).tier, 'free');
});

Deno.test('Edge: priority flag at tier boundary', () => {
// Priority at different call counts should always return priority pricing
assertEquals(getTierPrice(1, true).pricePerCall, 0.10);
assertEquals(getTierPrice(50, true).pricePerCall, 0.10);
assertEquals(getTierPrice(51, true).pricePerCall, 0.10);
assertEquals(getTierPrice(500, true).pricePerCall, 0.10);
assertEquals(getTierPrice(501, true).pricePerCall, 0.10);
});

Deno.test('Edge: batch cost with mixed tiers', () => {
// 50 free calls + 1 standard = /usr/bin/bash.01
const cost = calculateBatchCost(1, 51);
assertEquals(cost > 0, true);
});

Deno.test('Migration is idempotent', async () => {
const sql = await Deno.readTextFile('./migrations/add_tiered_pricing.sql');
assertEquals(sql.includes('IF NOT EXISTS'), true);
assertEquals(sql.includes('ON CONFLICT'), true);
});