Minimal Spec

The smallest useful test: one suite, one case, one assertion.

// assembly/__tests__/math.spec.ts
import { describe, expect, test } from "as-test";

describe("math", () => {
  test("adds numbers", () => {
    expect(1 + 2).toBe(3);
  });
});

Run it:

ast test

 PASS  math.spec.ts
 Tests:  1 passed, 1 total

There's no run() call here — as-test injects one when a spec defines suites but never calls it. Add an explicit run({ log: false }) only when you need RunOptions.

From here, add matchers from Assertions, or grow into Snapshots & Mocks.