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import type { StepId, Usage } from "@dispatch/wire";
import { describe, expect, it } from "vitest";
import { foldMetricEvent, initialState } from "./reducer";
import {
stepCount,
stepMetrics,
stepToolDuration,
stepTps,
totalDecodeMs,
totalInputTokens,
totalOutputTokens,
turnMetrics,
turnTps,
turnTtft,
} from "./selectors";
const sid = (s: string) => s as StepId;
const usage = (turnId: string, stepId: string, u: Usage) => ({
type: "usage" as const,
conversationId: "c1",
turnId,
stepId: sid(stepId),
usage: u,
});
const stepComplete = (
turnId: string,
stepId: string,
timing: { ttftMs?: number; decodeMs?: number; genTotalMs?: number },
) => ({
type: "step-complete" as const,
conversationId: "c1",
turnId,
stepId: sid(stepId),
...timing,
});
describe("foldMetricEvent", () => {
it("turn-start initializes an empty turn", () => {
const s = foldMetricEvent(initialState(), {
type: "turn-start",
conversationId: "c1",
turnId: "t1",
});
expect(s.turns.get("t1")?.steps).toEqual([]);
});
it("step-complete populates timing on a new step", () => {
let s = initialState();
s = foldMetricEvent(s, { type: "turn-start", conversationId: "c1", turnId: "t1" });
s = foldMetricEvent(
s,
stepComplete("t1", "s0", { ttftMs: 300, decodeMs: 800, genTotalMs: 1100 }),
);
const step = stepMetrics(s, "t1", 0);
expect(step?.ttftMs).toBe(300);
expect(step?.decodeMs).toBe(800);
expect(step?.genTotalMs).toBe(1100);
});
it("usage merges tokens into a step (joined by stepId)", () => {
let s = initialState();
s = foldMetricEvent(s, { type: "turn-start", conversationId: "c1", turnId: "t1" });
s = foldMetricEvent(s, stepComplete("t1", "s0", { genTotalMs: 500 }));
s = foldMetricEvent(s, usage("t1", "s0", { inputTokens: 100, outputTokens: 50 }));
const step = stepMetrics(s, "t1", 0);
expect(step?.usage?.inputTokens).toBe(100);
expect(step?.usage?.outputTokens).toBe(50);
expect(step?.genTotalMs).toBe(500); // timing preserved
});
it("usage without stepId is ignored", () => {
let s = initialState();
s = foldMetricEvent(s, { type: "turn-start", conversationId: "c1", turnId: "t1" });
s = foldMetricEvent(s, {
type: "usage",
conversationId: "c1",
turnId: "t1",
usage: { inputTokens: 100, outputTokens: 50 },
// no stepId
});
expect(s.turns.get("t1")?.steps).toEqual([]);
});
it("tool-result accumulates durationMs into its step", () => {
let s = initialState();
s = foldMetricEvent(s, { type: "turn-start", conversationId: "c1", turnId: "t1" });
s = foldMetricEvent(s, stepComplete("t1", "s0", {}));
s = foldMetricEvent(s, {
type: "tool-result",
conversationId: "c1",
turnId: "t1",
stepId: sid("s0"),
toolCallId: "tc1",
toolName: "bash",
content: "",
isError: false,
durationMs: 120,
});
s = foldMetricEvent(s, {
type: "tool-result",
conversationId: "c1",
turnId: "t1",
stepId: sid("s0"),
toolCallId: "tc2",
toolName: "bash",
content: "",
isError: false,
durationMs: 80,
});
const step = stepMetrics(s, "t1", 0);
expect(step?.toolDurationMs).toBe(200);
});
it("done records turn wall-clock and aggregate usage", () => {
let s = initialState();
s = foldMetricEvent(s, { type: "turn-start", conversationId: "c1", turnId: "t1" });
s = foldMetricEvent(s, {
type: "done",
conversationId: "c1",
turnId: "t1",
reason: "complete",
durationMs: 4200,
usage: { inputTokens: 800, outputTokens: 200 },
});
const turn = turnMetrics(s, "t1");
expect(turn?.wallMs).toBe(4200);
expect(turn?.doneUsage?.outputTokens).toBe(200);
});
it("events for an unknown turn are handled gracefully (step-complete, usage)", () => {
const s = initialState();
// step-complete for a turn we haven't started — creates the turn.
const s2 = foldMetricEvent(s, stepComplete("t1", "s0", { ttftMs: 100 }));
expect(s2.turns.get("t1")?.steps[0]?.ttftMs).toBe(100);
});
it("multiple steps accumulate in order", () => {
let s = initialState();
s = foldMetricEvent(s, { type: "turn-start", conversationId: "c1", turnId: "t1" });
s = foldMetricEvent(s, stepComplete("t1", "s0", { genTotalMs: 100 }));
s = foldMetricEvent(s, stepComplete("t1", "s1", { genTotalMs: 200 }));
expect(stepCount(s, "t1")).toBe(2);
expect(stepMetrics(s, "t1", 0)?.genTotalMs).toBe(100);
expect(stepMetrics(s, "t1", 1)?.genTotalMs).toBe(200);
});
it("non-metric events are no-ops", () => {
let s = initialState();
s = foldMetricEvent(s, { type: "turn-start", conversationId: "c1", turnId: "t1" });
s = foldMetricEvent(s, {
type: "text-delta",
conversationId: "c1",
turnId: "t1",
delta: "hi",
});
s = foldMetricEvent(s, {
type: "turn-sealed",
conversationId: "c1",
turnId: "t1",
});
expect(s.turns.get("t1")?.steps).toEqual([]);
});
});
describe("selectors — derived metrics", () => {
function populatedState() {
let s = initialState();
s = foldMetricEvent(s, { type: "turn-start", conversationId: "c1", turnId: "t1" });
s = foldMetricEvent(
s,
stepComplete("t1", "s0", { ttftMs: 300, decodeMs: 700, genTotalMs: 1000 }),
);
s = foldMetricEvent(s, usage("t1", "s0", { inputTokens: 500, outputTokens: 100 }));
s = foldMetricEvent(
s,
stepComplete("t1", "s1", { ttftMs: 200, decodeMs: 500, genTotalMs: 700 }),
);
s = foldMetricEvent(s, usage("t1", "s1", { inputTokens: 600, outputTokens: 80 }));
s = foldMetricEvent(s, {
type: "done",
conversationId: "c1",
turnId: "t1",
reason: "complete",
durationMs: 3500,
usage: { inputTokens: 1100, outputTokens: 180 },
});
return s;
}
it("stepTps = outputTokens / (decodeMs / 1000)", () => {
const s = populatedState();
const step = stepMetrics(s, "t1", 0)!;
expect(stepTps(step)).toBeCloseTo(100 / 0.7, 2);
});
it("turnTtft returns first step's ttftMs", () => {
expect(turnTtft(populatedState(), "t1")).toBe(300);
});
it("totalDecodeMs sums all steps' decodeMs", () => {
expect(totalDecodeMs(populatedState(), "t1")).toBe(1200);
});
it("turnTps = outputTokens / (totalDecodeMs / 1000)", () => {
const s = populatedState();
expect(turnTps(s, "t1")).toBeCloseTo(180 / 1.2, 2);
});
it("totalOutputTokens prefers done.usage over step sum", () => {
const s = populatedState();
expect(totalOutputTokens(s, "t1")).toBe(180); // from done.usage
});
it("totalInputTokens prefers done.usage over step sum", () => {
const s = populatedState();
expect(totalInputTokens(s, "t1")).toBe(1100);
});
it("stepToolDuration returns sum only when > 0", () => {
const withTools = foldMetricEvent(
foldMetricEvent(initialState(), { type: "turn-start", conversationId: "c1", turnId: "t1" }),
{
type: "tool-result",
conversationId: "c1",
turnId: "t1",
stepId: sid("s0"),
toolCallId: "tc1",
toolName: "bash",
content: "",
isError: false,
durationMs: 50,
},
);
const step = stepMetrics(withTools, "t1", 0)!;
expect(stepToolDuration(step)).toBe(50);
expect(stepToolDuration({ stepId: sid("s0") })).toBeUndefined();
});
it("returns undefined for absent fields gracefully", () => {
const s = initialState();
expect(turnMetrics(s, "missing")).toBeUndefined();
expect(turnTtft(s, "missing")).toBeUndefined();
expect(turnTps(s, "missing")).toBeUndefined();
});
});
|
