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

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

import { describe, expect, it, vi } from "vitest";
import { generateSessionId } from "./session-id";
import * as localStorage from "./local-storage";
describe("generateSessionId", () => {
    it("returns a session ID of the expected length", () => {
        const sessionId = generateSessionId();
        expect(sessionId).toHaveLength(16);
    });
    it("returns a session ID with proper flags when storage is supported", () => {
        vi.spyOn(localStorage, "isSupported", "get").mockReturnValue(true);
        const sessionId = generateSessionId();
        expect(sessionId.startsWith("00")).toBe(true);
    });
    it("returns a session ID with proper flags when storage is NOT supported", () => {
        vi.spyOn(localStorage, "isSupported", "get").mockReturnValue(false);
        const sessionId = generateSessionId();
        expect(sessionId.startsWith("01")).toBe(true);
    });
    it("returns a unique session ID on each call", () => {
        const sessionId1 = generateSessionId();
        const sessionId2 = generateSessionId();
        expect(sessionId1).not.toBe(sessionId2);
    });
});