1'use strict';
2const common = require('../common');
3const assert = require('assert');
4const result = process.cpuUsage();
5
6// Validate the result of calling with no previous value argument.
7validateResult(result);
8
9// Validate the result of calling with a previous value argument.
10validateResult(process.cpuUsage(result));
11
12// Ensure the results are >= the previous.
13let thisUsage;
14let lastUsage = process.cpuUsage();
15for (let i = 0; i < 10; i++) {
16  thisUsage = process.cpuUsage();
17  validateResult(thisUsage);
18  assert(thisUsage.user >= lastUsage.user);
19  assert(thisUsage.system >= lastUsage.system);
20  lastUsage = thisUsage;
21}
22
23// Ensure that the diffs are >= 0.
24let startUsage;
25let diffUsage;
26for (let i = 0; i < 10; i++) {
27  startUsage = process.cpuUsage();
28  diffUsage = process.cpuUsage(startUsage);
29  validateResult(startUsage);
30  validateResult(diffUsage);
31  assert(diffUsage.user >= 0);
32  assert(diffUsage.system >= 0);
33}
34
35// Ensure that an invalid shape for the previous value argument throws an error.
36assert.throws(
37  () => process.cpuUsage(1),
38  {
39    code: 'ERR_INVALID_ARG_TYPE',
40    name: 'TypeError',
41    message: 'The "prevValue" argument must be of type object. ' +
42             'Received type number (1)'
43  }
44);
45
46// Check invalid types.
47[
48  {},
49  { user: 'a' },
50  { user: null, system: 'c' },
51].forEach((value) => {
52  assert.throws(
53    () => process.cpuUsage(value),
54    {
55      code: 'ERR_INVALID_ARG_TYPE',
56      name: 'TypeError',
57      message: 'The "prevValue.user" property must be of type number.' +
58               common.invalidArgTypeHelper(value.user)
59    }
60  );
61});
62
63[
64  { user: 3, system: 'b' },
65  { user: 3, system: null },
66].forEach((value) => {
67  assert.throws(
68    () => process.cpuUsage(value),
69    {
70      code: 'ERR_INVALID_ARG_TYPE',
71      name: 'TypeError',
72      message: 'The "prevValue.system" property must be of type number.' +
73               common.invalidArgTypeHelper(value.system)
74    }
75  );
76});
77
78// Check invalid values.
79[
80  { user: -1, system: 2 },
81  { user: Number.POSITIVE_INFINITY, system: 4 },
82].forEach((value) => {
83  assert.throws(
84    () => process.cpuUsage(value),
85    {
86      code: 'ERR_INVALID_ARG_VALUE',
87      name: 'RangeError',
88      message: "The property 'prevValue.user' is invalid. " +
89        `Received ${value.user}`,
90    }
91  );
92});
93
94[
95  { user: 3, system: -2 },
96  { user: 5, system: Number.NEGATIVE_INFINITY },
97].forEach((value) => {
98  assert.throws(
99    () => process.cpuUsage(value),
100    {
101      code: 'ERR_INVALID_ARG_VALUE',
102      name: 'RangeError',
103      message: "The property 'prevValue.system' is invalid. " +
104        `Received ${value.system}`,
105    }
106  );
107});
108
109// Ensure that the return value is the expected shape.
110function validateResult(result) {
111  assert.notStrictEqual(result, null);
112
113  assert(Number.isFinite(result.user));
114  assert(Number.isFinite(result.system));
115
116  assert(result.user >= 0);
117  assert(result.system >= 0);
118}
119