@dash0/sdk-web/dist/modules/utils/span-id_test.js

Dash0's Web SDK to collect telemetry from end-users' web browsers

import { describe, expect } from "vitest";
import { generateSpanId } from "./span-id";
describe("generateSpanId", () => {
    it("returns a span ID of the expected length", () => {
        expect(generateSpanId("abcdef1234567890abcdef1234567890")).toHaveLength(16);
    });
    it("returns the same prefix for the same trace ID", () => {
        const traceId = "abcdef1234567890abcdef1234567890";
        const spanId1 = generateSpanId(traceId);
        const spanId2 = generateSpanId(traceId);
        expect(spanId1.substring(0, 8)).toBe(spanId2.substring(0, 8));
        expect(spanId1).not.equals(spanId2);
    });
    it("returns different prefix for span ID for different trace IDs", () => {
        const spanId1 = generateSpanId("abcdef1234567890abcdef1234567890");
        const spanId2 = generateSpanId("1234567890abcdef1234567890abcdef");
        expect(spanId1.substring(0, 8)).not.equals(spanId2.substring(0, 8));
        expect(spanId1).not.equals(spanId2);
    });
    it("return a span id with the correct prefix", () => {
        expect(generateSpanId("abcdef1234567890abcdef1234567890").substring(0, 8)).toEqual("07d06023");
        expect(generateSpanId("1234567890abcdef1234567890abcdef").substring(0, 8)).toEqual("75df3ddf");
        expect(generateSpanId("d0420000a7a996090df1cac9a99d3cb7").substring(0, 8)).toEqual("120e82be");
    });
});