test/parallel/test-process-hrtime.js

// Copyright Joyent, Inc. and other Node contributors.
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// Flags: --allow-natives-syntax --expose-internals --no-warnings
'use strict';
const common = require('../common');
const assert = require('assert');

const { internalBinding } = require('internal/test/binding');

// The default behavior, return an Array "tuple" of numbers
const tuple = process.hrtime();

// Validate the default behavior
validateTuple(tuple);

// Validate that passing an existing tuple returns another valid tuple
validateTuple(process.hrtime(tuple));

// Test that only an Array may be passed to process.hrtime()
assert.throws(() => {
  process.hrtime(1);
}, {
  code: 'ERR_INVALID_ARG_TYPE',
  name: 'TypeError',
  message: 'The "time" argument must be an instance of Array. Received type ' +
           'number (1)'
});
assert.throws(() => {
  process.hrtime([]);
}, {
  code: 'ERR_OUT_OF_RANGE',
  name: 'RangeError',
  message: 'The value of "time" is out of range. It must be 2. Received 0'
});
assert.throws(() => {
  process.hrtime([1]);
}, {
  code: 'ERR_OUT_OF_RANGE',
  name: 'RangeError',
  message: 'The value of "time" is out of range. It must be 2. Received 1'
});
assert.throws(() => {
  process.hrtime([1, 2, 3]);
}, {
  code: 'ERR_OUT_OF_RANGE',
  name: 'RangeError',
  message: 'The value of "time" is out of range. It must be 2. Received 3'
});

function validateTuple(tuple) {
  assert(Array.isArray(tuple));
  assert.strictEqual(tuple.length, 2);
  assert(Number.isInteger(tuple[0]));
  assert(Number.isInteger(tuple[1]));
}

const diff = process.hrtime([0, 1e9 - 1]);
assert(diff[1] >= 0); // https://github.com/nodejs/node/issues/4751

eval('%PrepareFunctionForOptimization(process.hrtime)');
assert(process.hrtime());
eval('%OptimizeFunctionOnNextCall(process.hrtime)');
assert(process.hrtime());

if (common.isDebug) {
  const { getV8FastApiCallCount } = internalBinding('debug');
  assert.strictEqual(getV8FastApiCallCount('process.hrtime'), 1);
}