Overriding a Single Method in `Path` for Testing Without Type Casting

describe('program', () => {
  it('calls path.join', async () => {
    const join = mock();
    const layer = createTestPathLayer({ join });
    await program.pipe(Effect.provide(layer), Effect.runPromise);

    expect(join).toHaveBeenCalled();
  });
});

const createTestPathLayer = (overrides?: Partial<Path.Path>) =>
  Layer.effect(
    Path.Path,
    Effect.gen(function* () {
      const path = yield* Path.Path;

      return { ...path, ...overrides };
    }).pipe(Effect.provide(Path.layer)),
  );