Reduced test case for https://github.com/avajs/ava/issues/1999

index.js

let state = 0;

console.log('Load module')

async function increment() {
  state = state + 1;
}

function getState() {
  return state;
}

module.exports = {increment, getState};

test.js

// This file should be in test/test.js

import test from 'ava';
import clearModule from 'clear-module';

test.beforeEach(t => {
  clearModule('..');
  t.context.m = require('..');
});

test('Test 1', async t => {
  await t.context.m.increment();
  t.is(t.context.m.getState(), 1);
});

test('Test 2', async t => {
  await t.context.m.increment();
  t.is(t.context.m.getState(), 1);
});