silphius/app/astride/evaluators/unary.test.js

import {expect, test} from 'vitest';

import evaluate from '@/astride/evaluate.js';
import expression from '@/astride/test/expression.js';

test('evaluates +', async () => {
  expect(evaluate(await expression('+1')))
    .to.deep.include({value: 1});
});

test('evaluates -', async () => {
  expect(evaluate(await expression('-1')))
    .to.deep.include({value: -1});
});

test('evaluates !', async () => {
  expect(evaluate(await expression('!true')))
    .to.deep.include({value: false});
});

test('evaluates ~', async () => {
  expect(evaluate(await expression('~1')))
    .to.deep.include({value: -2});
});

test('evaluates typeof', async () => {
  expect(evaluate(await expression('typeof "a"')))
    .to.deep.include({value: 'string'});
});

test('evaluates void', async () => {
  expect(evaluate(await expression('void 0')))
    .to.deep.include({value: undefined});
});

test('evaluates promised unary expression', async () => {
  const evaluated = evaluate(await expression('-(await 4)'));
  expect(evaluated.async)
    .to.equal(true);
  expect(await evaluated.value)
    .to.equal(-4);
});