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Platform Support

The following shows Assert module APIs available for each platform.

Linux
(Ubuntu)		 Tizen
(Raspberry Pi)		 Raspbian
(Raspberry Pi)		 NuttX
(STM32F4-Discovery)		 TizenRT
(Artik053)
assert.assert O O O O O
assert.doesNotThrow O O O O O
assert.equal O O O O O
assert.fail O O O O O
assert.notEqual O O O O O
assert.notStrictEqual O O O O O
assert.strictEqual O O O O O
assert.throws O O O O O

Assert

Assert module is designed for writing tests for applications.

You can access the functions of the module by adding require('assert') to your file.

Class: AssertionError

Assert module will produce AssertionError in case of an assertion failure. AssertionError inherits standard Error thus it has properties provided by Error object including additional properties.

  • actual {any} This property contains the actual value.
  • expected {any} This property contains the expected value.
  • message {any} The error message, default value is the error itself.
  • name {string} The name is AssertionError string.
  • operator {string} This property contains the operator used for comparing actual with expected.

assert(value[, message])

  • value {any} Value to test.
  • message {any} Message displayed in the thrown error.

Checks if the value is truthy. If it is not, throws an AssertionError, with the given optional message.

Example

var assert = require('assert');

assert.assert(1);
// OK

assert.assert(true);
// OK

assert.assert(false);
// throws "AssertionError: false == true"

assert.assert(0);
// throws "AssertionError: 0 == true"

assert.assert(false, "it's false");
// throws "AssertionError: it's false"

doesNotThrow(block[, message])

  • block {Function}
  • message {any} Message to be displayed.

Tests if the given block does not throw any exception. Otherwise throws an exception with the given optional message.

Example

var assert = require('assert');

assert.doesNotThrow(
  function() {
    assert.assert(1);
  }
);
// OK

assert.doesNotThrow(
  function() {
    assert.assert(0);
  }
)
// throws "AssertionError: Got unwanted exception."

equal(actual, expected[, message])

  • actual {any} The actual value.
  • expected {any} The expected value.
  • message {any} Message to be displayed.

Tests if actual == expected is evaluated to true. Otherwise throws an exception with the given optional message.

Example

var assert = require('assert');

assert.equal(1, 1);
assert.equal(1, '1');

fail(actual, expected, message, operator)

  • actual {any} The actual value.
  • expected {any} The expected value.
  • message {any} Message to be displayed.
  • operator {string} The operator.

Throws an AssertionError exception with the given message.

Example

var assert = require('assert');

assert.fail(1, 2, undefined, '>');
// AssertionError: 1 > 2

notEqual(actual, expected[, message])

  • actual {any} The actual value.
  • expected {any} The expected value.
  • message {any} Message to be displayed.

Tests if actual != expected is evaluated to true. Otherwise throws an exception with the given optional message.

Example

var assert = require('assert');

assert.notEqual(1, 2);

notStrictEqual(actual, expected[, message])

  • actual {any} The actual value.
  • expected {any} The expected value.
  • message {any} Message to be displayed.

Tests if actual !== expected is evaluated to true. Otherwise throws an exception with the given optional message.

Example

var assert = require('assert');

assert.notStrictEqual(1, 2);
// OK

assert.notStrictEqual(1, 1);
// AssertionError: 1 !== 1

assert.notStrictEqual(1, '1');
// OK

strictEqual(actual, expected[, message])

  • actual {any} The actual value.
  • expected {any} The expected value.
  • message {any} Message to be displayed.

Tests if actual === expected is evaluated to true. Otherwise throws an exception with the given optional message.

Example

var assert = require('assert');

assert.strictEqual(1, 1);
// OK

assert.strictEqual(1, 2);
// AssertionError: 1 === 2

assert.strictEqual(1, '1');
// AssertionError: 1 === '1'

throws(block[, expected, message])

  • block {Function} The function that throws an error.
  • expected {Function} The expected error type.
  • message {any} Message to be displayed.

Tests if the given block throws an expected error. Otherwise throws an exception with the given optional message.

Example

var assert = require('assert');

assert.throws(
  function() {
    assert.equal(1, 2);
  },
  assert.AssertionError
);
// OK

assert.throws(
  function() {
    assert.equal(1, 1);
  },
  assert.AssertionError
);
// Uncaught error: Missing exception

assert.throws(
  function() {
    assert.equal(1, 2);
  },
  TypeError
);
// AssertionError