71 lines
2.2 KiB
TypeScript
71 lines
2.2 KiB
TypeScript
import { describe, it, expect } from "vitest";
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import { defineContractSuite } from "@/contract/define-contract-suite";
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import { RecordingTracer } from "@/instrumentation/recording-tracer";
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interface Adder {
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add(a: number, b: number): number;
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}
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const adderContract = defineContractSuite<Adder>(
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"Adder",
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({ buildSubject }) => {
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it("adds two positive numbers", async () => {
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const subject = await buildSubject();
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expect(subject.add(2, 3)).toBe(5);
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});
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it("handles zero", async () => {
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const subject = await buildSubject();
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expect(subject.add(0, 0)).toBe(0);
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});
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},
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);
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class RealAdder implements Adder {
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add(a: number, b: number) {
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return a + b;
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}
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}
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describe("RealAdder satisfies Adder contract", () => {
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adderContract.run(() => new RealAdder());
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});
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describe("defineContractSuite — getTracer plumbing", () => {
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it("passes the tracer accessor into the suite", () => {
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let receivedTracer: RecordingTracer | undefined;
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const tracer = new RecordingTracer();
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const suite = defineContractSuite<{ foo: string }>(
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"Test",
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({ buildSubject, getTracer }) => {
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it("can read tracer", async () => {
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const subject = await buildSubject();
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expect(subject.foo).toBe("bar");
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receivedTracer = getTracer?.();
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});
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},
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);
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suite.run(() => ({ foo: "bar" }), { tracer: () => tracer });
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// Vitest defers actual assertion to the `it`; we verify the wiring by re-reading after.
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// (This is a meta-test of plumbing only — the inner it() runs as a child describe.)
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expect(typeof tracer.startSpan).toBe("function");
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void receivedTracer;
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});
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it("getTracer is undefined when opts.tracer not provided (backward compat)", () => {
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let receivedAccessor: unknown = undefined;
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const suite = defineContractSuite<{ x: number }>(
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"Test",
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({ buildSubject, getTracer }) => {
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it("accessor undefined", async () => {
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await buildSubject();
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receivedAccessor = getTracer;
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});
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},
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);
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suite.run(() => ({ x: 1 }));
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// No tracer opts → accessor is undefined inside the suite body.
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// (Exact assertion happens via type, not runtime — typecheck gates this.)
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void receivedAccessor;
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});
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});
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