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'use strict';
require('../common');
const assert = require('assert');
const result = process.cpuUsage();
// Validate the result of calling with no previous value argument.
validateResult(result);
// Validate the result of calling with a previous value argument.
validateResult(process.cpuUsage(result));
// Ensure the results are >= the previous.
let thisUsage;
let lastUsage = process.cpuUsage();
for (let i = 0; i < 10; i++) {
thisUsage = process.cpuUsage();
validateResult(thisUsage);
assert(thisUsage.user >= lastUsage.user);
assert(thisUsage.system >= lastUsage.system);
lastUsage = thisUsage;
}
// Ensure that the diffs are >= 0.
let startUsage;
let diffUsage;
for (let i = 0; i < 10; i++) {
startUsage = process.cpuUsage();
diffUsage = process.cpuUsage(startUsage);
validateResult(startUsage);
validateResult(diffUsage);
assert(diffUsage.user >= 0);
assert(diffUsage.system >= 0);
}
// Ensure that an invalid shape for the previous value argument throws an error.
assert.throws(
() => process.cpuUsage(1),
{
code: 'ERR_INVALID_ARG_TYPE',
name: 'TypeError',
message: 'The "prevValue" argument must be of type object. ' +
'Received type number'
}
);
// Check invalid types.
[
{},
{ user: 'a' },
{ user: null, system: 'c' },
].forEach((value) => {
assert.throws(
() => process.cpuUsage(value),
{
code: 'ERR_INVALID_ARG_TYPE',
name: 'TypeError',
message: 'The "prevValue.user" property must be of type number. ' +
`Received type ${typeof value.user}`
}
);
});
[
{ user: 3, system: 'b' },
{ user: 3, system: null }
].forEach((value) => {
assert.throws(
() => process.cpuUsage(value),
{
code: 'ERR_INVALID_ARG_TYPE',
name: 'TypeError',
message: 'The "prevValue.system" property must be of type number. ' +
`Received type ${typeof value.system}`
}
);
});
// Check invalid values.
[
{ user: -1, system: 2 },
{ user: Number.POSITIVE_INFINITY, system: 4 }
].forEach((value) => {
assert.throws(
() => process.cpuUsage(value),
{
code: 'ERR_INVALID_OPT_VALUE',
name: 'RangeError',
message: `The value "${value.user}" is invalid ` +
'for option "prevValue.user"'
}
);
});
[
{ user: 3, system: -2 },
{ user: 5, system: Number.NEGATIVE_INFINITY }
].forEach((value) => {
assert.throws(
() => process.cpuUsage(value),
{
code: 'ERR_INVALID_OPT_VALUE',
name: 'RangeError',
message: `The value "${value.system}" is invalid ` +
'for option "prevValue.system"'
}
);
});
// Ensure that the return value is the expected shape.
function validateResult(result) {
assert.notStrictEqual(result, null);
assert(Number.isFinite(result.user));
assert(Number.isFinite(result.system));
assert(result.user >= 0);
assert(result.system >= 0);
}