Assert

This module is used for writing unit tests for your applications, you can access it with require('assert').

Table of Contents #

assert.fail(actual, expected, message, operator) #

Throws an exception that displays the values for actual and expected separated by the provided operator.

assert(value, message), assert.ok(value, [message]) #

Tests if value is a true value, it is equivalent to assert.equal(true, value, message);

assert.equal(actual, expected, [message]) #

Tests shallow, coercive equality with the equal comparison operator ( == ).

assert.notEqual(actual, expected, [message]) #

Tests shallow, coercive non-equality with the not equal comparison operator ( != ).

assert.deepEqual(actual, expected, [message]) #

Tests for deep equality.

assert.notDeepEqual(actual, expected, [message]) #

Tests for any deep inequality.

assert.strictEqual(actual, expected, [message]) #

Tests strict equality, as determined by the strict equality operator ( === )

assert.notStrictEqual(actual, expected, [message]) #

Tests strict non-equality, as determined by the strict not equal operator ( !== )

assert.throws(block, [error], [message]) #

Expects block to throw an error. error can be constructor, regexp or validation function.

Validate instanceof using constructor:

assert.throws(
  function() {
    throw new Error("Wrong value");
  },
  Error
);

Validate error message using RegExp:

assert.throws(
  function() {
    throw new Error("Wrong value");
  },
  /value/
);

Custom error validation:

assert.throws(
  function() {
    throw new Error("Wrong value");
  },
  function(err) {
    if ( (err instanceof Error) && /value/.test(err) ) {
      return true;
    }
  },
  "unexpected error"
);

assert.doesNotThrow(block, [error], [message]) #

Expects block not to throw an error, see assert.throws for details.

assert.ifError(value) #

Tests if value is not a false value, throws if it is a true value. Useful when testing the first argument, error in callbacks.

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