Import Mocks

Use mockImport(...) when the thing you want to replace is addressed by import path.

import { expect, mockImport, test, unmockImport } from "as-test";

mockImport("env.read", (): i32 => 7);

test("uses mocked host import", () => {
  expect(readValue()).toBe(7);
});

unmockImport("env.read");

Good Uses

• host imports
• thin environment wrappers
• runtime-provided functions that are awkward to reproduce in tests

Tips

• prefer small wrapper modules around important imports
• mock the narrowest path you can
• reset with unmockImport(...) when the test no longer needs the override