test runner with `only` feature

index.js

import {report} from './tester.js';

report();

package.json

{
  "name": "only",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "node -r esm -r ./spec.js ./index.js",
    "test:only": "ONLY=true npm t"
  },
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "esm": "^3.2.25",
    "zora": "^3.0.3"
  }
}

spec.js

import {test} from './tester.js';

test('should not run', t=> {
    t.fail('do not run');
});

test('should run #only', t=> {
    t.ok(true, 'I ran');
});

test('should not run either', t=> {
    t.fail('do not run');
});

tester.js

import {createHarness} from 'zora';

const harness = createHarness();

export const test = (desc, fn) => {
    if(process.env.ONLY && desc.includes('#only') === false){
        return harness.skip(desc, fn);
    }
    return harness.test(desc, fn);
};

export const report = async () => {
    try {
        await harness.report();
    } catch (e) {
        console.error(e);
        process.exit(1);
    } finally {
        process.exit(harness.pass ? 0 : 1);
    }
};