Jest Testing Best Practices

Quick Start

import { run } from "../src/api";

describe("interpreter", () => {
  it("evaluates arithmetic expressions", () => {
    expect(run("2 + 3")).toBe(5);
  });

  it("handles errors gracefully", () => {
    expect(() => run("undefined_var")).toThrow(/undefined/i);
  });
});

Core Principles