101 lines
3.1 KiB
Go
101 lines
3.1 KiB
Go
package session
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import (
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"math"
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"testing"
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"ollie/backend"
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)
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func approxEqual(a, b, tol float64) bool {
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return math.Abs(a-b) <= tol
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}
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// TestComputeCostUSD_BaseTokens verifies input+output pricing with no cache fields.
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func TestComputeCostUSD_BaseTokens(t *testing.T) {
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// claude-sonnet-4: $3/M input, $15/M output
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got := computeCostUSD("claude-sonnet-4-5", backend.Usage{
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InputTokens: 1_000_000,
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OutputTokens: 1_000_000,
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})
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want := 3.00 + 15.00
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if !approxEqual(got, want, 0.001) {
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t.Errorf("got %.4f; want %.4f", got, want)
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}
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}
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// TestComputeCostUSD_ClaudeCacheReadDiscount verifies that cached input tokens
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// are charged at 10% of the normal input rate for Claude models.
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func TestComputeCostUSD_ClaudeCacheReadDiscount(t *testing.T) {
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// claude-sonnet-4: $3/M input → cache read = $0.30/M
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got := computeCostUSD("claude-sonnet-4-5", backend.Usage{
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InputTokens: 0,
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CachedInputTokens: 1_000_000,
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OutputTokens: 0,
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})
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want := 0.30 // 10% of $3.00
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if !approxEqual(got, want, 0.001) {
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t.Errorf("claude cache read: got %.4f; want %.4f", got, want)
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}
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}
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// TestComputeCostUSD_NonClaudeCacheReadDiscount verifies that cached input tokens
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// are charged at 50% of the normal input rate for non-Claude models (OpenAI).
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func TestComputeCostUSD_NonClaudeCacheReadDiscount(t *testing.T) {
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// gpt-4o: $2.50/M input → cache read = $1.25/M
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got := computeCostUSD("gpt-4o", backend.Usage{
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InputTokens: 0,
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CachedInputTokens: 1_000_000,
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OutputTokens: 0,
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})
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want := 1.25 // 50% of $2.50
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if !approxEqual(got, want, 0.001) {
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t.Errorf("gpt-4o cache read: got %.4f; want %.4f", got, want)
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}
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}
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// TestComputeCostUSD_CacheCreationSurcharge verifies cache creation tokens are
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// charged at 125% of the normal input rate.
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func TestComputeCostUSD_CacheCreationSurcharge(t *testing.T) {
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// claude-sonnet-4: $3/M input → cache creation = $3.75/M
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got := computeCostUSD("claude-sonnet-4-5", backend.Usage{
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InputTokens: 0,
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CacheCreationTokens: 1_000_000,
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OutputTokens: 0,
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})
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want := 3.75 // 125% of $3.00
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if !approxEqual(got, want, 0.001) {
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t.Errorf("cache creation surcharge: got %.4f; want %.4f", got, want)
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}
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}
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// TestComputeCostUSD_AllFieldsCombined verifies that all four token categories
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// are summed correctly in a single call.
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func TestComputeCostUSD_AllFieldsCombined(t *testing.T) {
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// claude-sonnet-4: $3/M in, $15/M out
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// 100k normal input = $0.30
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// 200k cached input = $0.06 (10% of $3/M)
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// 50k cache create = $0.1875 (125% of $3/M)
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// 100k output = $1.50
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got := computeCostUSD("claude-sonnet-4-5", backend.Usage{
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InputTokens: 100_000,
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CachedInputTokens: 200_000,
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CacheCreationTokens: 50_000,
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OutputTokens: 100_000,
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})
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want := 0.30 + 0.06 + 0.1875 + 1.50
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if !approxEqual(got, want, 0.0001) {
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t.Errorf("combined: got %.6f; want %.6f", got, want)
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}
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}
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// TestComputeCostUSD_UnknownModelZero verifies that unknown/local models return 0.
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func TestComputeCostUSD_UnknownModelZero(t *testing.T) {
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got := computeCostUSD("llama-3-local", backend.Usage{
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InputTokens: 1_000_000, OutputTokens: 1_000_000,
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})
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if got != 0 {
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t.Errorf("unknown model: got %.4f; want 0", got)
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}
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}
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