node/test/parallel/test-assert.js

// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.

'use strict';
const common = require('../common');
const assert = require('assert');
const a = require('assert');

function makeBlock(f) {
  const args = Array.prototype.slice.call(arguments, 1);
  return function() {
    return f.apply(this, args);
  };
}

assert.ok(a.AssertionError.prototype instanceof Error,
          'a.AssertionError instanceof Error');

assert.throws(makeBlock(a, false), a.AssertionError, 'ok(false)');

// Using a object as second arg results in a failure
assert.throws(
  () => { assert.throws(() => { throw new Error(); }, { foo: 'bar' }); },
  common.expectsError({
    type: TypeError,
    message: 'expected.test is not a function'
  })
);


assert.doesNotThrow(makeBlock(a, true), a.AssertionError, 'ok(true)');

assert.doesNotThrow(makeBlock(a, 'test', 'ok(\'test\')'));

assert.throws(makeBlock(a.ok, false),
              a.AssertionError, 'ok(false)');

assert.doesNotThrow(makeBlock(a.ok, true),
                    a.AssertionError, 'ok(true)');

assert.doesNotThrow(makeBlock(a.ok, 'test'), 'ok(\'test\')');

assert.throws(makeBlock(a.equal, true, false),
              a.AssertionError, 'equal(true, false)');

assert.doesNotThrow(makeBlock(a.equal, null, null),
                    'equal(null, null)');

assert.doesNotThrow(makeBlock(a.equal, undefined, undefined),
                    'equal(undefined, undefined)');

assert.doesNotThrow(makeBlock(a.equal, null, undefined),
                    'equal(null, undefined)');

assert.doesNotThrow(makeBlock(a.equal, true, true), 'equal(true, true)');

assert.doesNotThrow(makeBlock(a.equal, 2, '2'), 'equal(2, \'2\')');

assert.doesNotThrow(makeBlock(a.notEqual, true, false),
                    'notEqual(true, false)');

assert.throws(makeBlock(a.notEqual, true, true),
              a.AssertionError, 'notEqual(true, true)');

assert.throws(makeBlock(a.strictEqual, 2, '2'),
              a.AssertionError, 'strictEqual(2, \'2\')');

assert.throws(makeBlock(a.strictEqual, null, undefined),
              a.AssertionError, 'strictEqual(null, undefined)');

assert.throws(makeBlock(a.notStrictEqual, 2, 2),
              a.AssertionError, 'notStrictEqual(2, 2)');

assert.doesNotThrow(makeBlock(a.notStrictEqual, 2, '2'),
                    'notStrictEqual(2, \'2\')');

// deepEqual joy!
assert.doesNotThrow(makeBlock(a.deepEqual, new Date(2000, 3, 14),
                              new Date(2000, 3, 14)),
                    'deepEqual(new Date(2000, 3, 14), new Date(2000, 3, 14))');

assert.throws(makeBlock(a.deepEqual, new Date(), new Date(2000, 3, 14)),
              a.AssertionError,
              'deepEqual(new Date(), new Date(2000, 3, 14))');

assert.throws(
  makeBlock(a.notDeepEqual, new Date(2000, 3, 14), new Date(2000, 3, 14)),
  a.AssertionError,
  'notDeepEqual(new Date(2000, 3, 14), new Date(2000, 3, 14))'
);

assert.doesNotThrow(makeBlock(
  a.notDeepEqual,
  new Date(),
  new Date(2000, 3, 14)),
                    'notDeepEqual(new Date(), new Date(2000, 3, 14))'
);

assert.doesNotThrow(makeBlock(a.deepEqual, /a/, /a/));
assert.doesNotThrow(makeBlock(a.deepEqual, /a/g, /a/g));
assert.doesNotThrow(makeBlock(a.deepEqual, /a/i, /a/i));
assert.doesNotThrow(makeBlock(a.deepEqual, /a/m, /a/m));
assert.doesNotThrow(makeBlock(a.deepEqual, /a/igm, /a/igm));
assert.throws(makeBlock(a.deepEqual, /ab/, /a/),
              common.expectsError({
                code: 'ERR_ASSERTION',
                type: a.AssertionError,
                message: /^\/ab\/ deepEqual \/a\/$/
              }));
assert.throws(makeBlock(a.deepEqual, /a/g, /a/),
              common.expectsError({
                code: 'ERR_ASSERTION',
                type: a.AssertionError,
                message: /^\/a\/g deepEqual \/a\/$/
              }));
assert.throws(makeBlock(a.deepEqual, /a/i, /a/),
              common.expectsError({
                code: 'ERR_ASSERTION',
                type: a.AssertionError,
                message: /^\/a\/i deepEqual \/a\/$/
              }));
assert.throws(makeBlock(a.deepEqual, /a/m, /a/),
              common.expectsError({
                code: 'ERR_ASSERTION',
                type: a.AssertionError,
                message: /^\/a\/m deepEqual \/a\/$/
              }));
assert.throws(makeBlock(a.deepEqual, /a/igm, /a/im),
              common.expectsError({
                code: 'ERR_ASSERTION',
                type: a.AssertionError,
                message: /^\/a\/gim deepEqual \/a\/im$/
              }));

{
  const re1 = /a/g;
  re1.lastIndex = 3;
  assert.doesNotThrow(makeBlock(a.deepEqual, re1, /a/g),
                      common.expectsError({
                        code: 'ERR_ASSERTION',
                        message: /^\/a\/g deepEqual \/a\/g$/
                      }));
}

assert.doesNotThrow(makeBlock(a.deepEqual, 4, '4'), 'deepEqual(4, \'4\')');
assert.doesNotThrow(makeBlock(a.deepEqual, true, 1), 'deepEqual(true, 1)');
assert.throws(makeBlock(a.deepEqual, 4, '5'),
              a.AssertionError,
              'deepEqual( 4, \'5\')');

// having the same number of owned properties && the same set of keys
assert.doesNotThrow(makeBlock(a.deepEqual, {a: 4}, {a: 4}));
assert.doesNotThrow(makeBlock(a.deepEqual, {a: 4, b: '2'}, {a: 4, b: '2'}));
assert.doesNotThrow(makeBlock(a.deepEqual, [4], ['4']));
assert.throws(makeBlock(a.deepEqual, {a: 4}, {a: 4, b: true}),
              a.AssertionError);
assert.doesNotThrow(makeBlock(a.deepEqual, ['a'], {0: 'a'}));
//(although not necessarily the same order),
assert.doesNotThrow(makeBlock(a.deepEqual, {a: 4, b: '1'}, {b: '1', a: 4}));
const a1 = [1, 2, 3];
const a2 = [1, 2, 3];
a1.a = 'test';
a1.b = true;
a2.b = true;
a2.a = 'test';
assert.throws(makeBlock(a.deepEqual, Object.keys(a1), Object.keys(a2)),
              a.AssertionError);
assert.doesNotThrow(makeBlock(a.deepEqual, a1, a2));

// having an identical prototype property
const nbRoot = {
  toString: function() { return `${this.first} ${this.last}`; }
};

function nameBuilder(first, last) {
  this.first = first;
  this.last = last;
  return this;
}
nameBuilder.prototype = nbRoot;

function nameBuilder2(first, last) {
  this.first = first;
  this.last = last;
  return this;
}
nameBuilder2.prototype = nbRoot;

const nb1 = new nameBuilder('Ryan', 'Dahl');
let nb2 = new nameBuilder2('Ryan', 'Dahl');

assert.doesNotThrow(makeBlock(a.deepEqual, nb1, nb2));

nameBuilder2.prototype = Object;
nb2 = new nameBuilder2('Ryan', 'Dahl');
assert.doesNotThrow(makeBlock(a.deepEqual, nb1, nb2));

// primitives and object
assert.throws(makeBlock(a.deepEqual, null, {}), a.AssertionError);
assert.throws(makeBlock(a.deepEqual, undefined, {}), a.AssertionError);
assert.throws(makeBlock(a.deepEqual, 'a', ['a']), a.AssertionError);
assert.throws(makeBlock(a.deepEqual, 'a', {0: 'a'}), a.AssertionError);
assert.throws(makeBlock(a.deepEqual, 1, {}), a.AssertionError);
assert.throws(makeBlock(a.deepEqual, true, {}), a.AssertionError);
assert.throws(makeBlock(a.deepEqual, Symbol(), {}), a.AssertionError);

// primitive wrappers and object
assert.doesNotThrow(makeBlock(a.deepEqual, new String('a'), ['a']),
                    a.AssertionError);
assert.doesNotThrow(makeBlock(a.deepEqual, new String('a'), {0: 'a'}),
                    a.AssertionError);
assert.doesNotThrow(makeBlock(a.deepEqual, new Number(1), {}),
                    a.AssertionError);
assert.doesNotThrow(makeBlock(a.deepEqual, new Boolean(true), {}),
                    a.AssertionError);

// same number of keys but different key names
assert.throws(makeBlock(a.deepEqual, {a: 1}, {b: 1}), a.AssertionError);

//deepStrictEqual
assert.doesNotThrow(
  makeBlock(a.deepStrictEqual, new Date(2000, 3, 14), new Date(2000, 3, 14)),
  'deepStrictEqual(new Date(2000, 3, 14), new Date(2000, 3, 14))'
);

assert.throws(
  makeBlock(a.deepStrictEqual, new Date(), new Date(2000, 3, 14)),
  a.AssertionError,
  'deepStrictEqual(new Date(), new Date(2000, 3, 14))'
);

assert.throws(
  makeBlock(a.notDeepStrictEqual, new Date(2000, 3, 14), new Date(2000, 3, 14)),
  a.AssertionError,
  'notDeepStrictEqual(new Date(2000, 3, 14), new Date(2000, 3, 14))'
);

assert.doesNotThrow(
  makeBlock(a.notDeepStrictEqual, new Date(), new Date(2000, 3, 14)),
  'notDeepStrictEqual(new Date(), new Date(2000, 3, 14))'
);

assert.doesNotThrow(makeBlock(a.deepStrictEqual, /a/, /a/));
assert.doesNotThrow(makeBlock(a.deepStrictEqual, /a/g, /a/g));
assert.doesNotThrow(makeBlock(a.deepStrictEqual, /a/i, /a/i));
assert.doesNotThrow(makeBlock(a.deepStrictEqual, /a/m, /a/m));
assert.doesNotThrow(makeBlock(a.deepStrictEqual, /a/igm, /a/igm));
assert.throws(
  makeBlock(a.deepStrictEqual, /ab/, /a/),
  common.expectsError({
    code: 'ERR_ASSERTION',
    type: a.AssertionError,
    message: /^\/ab\/ deepStrictEqual \/a\/$/
  }));
assert.throws(
  makeBlock(a.deepStrictEqual, /a/g, /a/),
  common.expectsError({
    code: 'ERR_ASSERTION',
    type: a.AssertionError,
    message: /^\/a\/g deepStrictEqual \/a\/$/
  }));
assert.throws(
  makeBlock(a.deepStrictEqual, /a/i, /a/),
  common.expectsError({
    code: 'ERR_ASSERTION',
    type: a.AssertionError,
    message: /^\/a\/i deepStrictEqual \/a\/$/
  }));
assert.throws(
  makeBlock(a.deepStrictEqual, /a/m, /a/),
  common.expectsError({
    code: 'ERR_ASSERTION',
    type: a.AssertionError,
    message: /^\/a\/m deepStrictEqual \/a\/$/
  }));
assert.throws(
  makeBlock(a.deepStrictEqual, /a/igm, /a/im),
  common.expectsError({
    code: 'ERR_ASSERTION',
    type: a.AssertionError,
    message: /^\/a\/gim deepStrictEqual \/a\/im$/
  }));

{
  const re1 = /a/;
  re1.lastIndex = 3;
  assert.doesNotThrow(makeBlock(a.deepStrictEqual, re1, /a/));
}

assert.throws(makeBlock(a.deepStrictEqual, 4, '4'),
              a.AssertionError,
              'deepStrictEqual(4, \'4\')');

assert.throws(makeBlock(a.deepStrictEqual, true, 1),
              a.AssertionError,
              'deepStrictEqual(true, 1)');

assert.throws(makeBlock(a.deepStrictEqual, 4, '5'),
              a.AssertionError,
              'deepStrictEqual(4, \'5\')');

// having the same number of owned properties && the same set of keys
assert.doesNotThrow(makeBlock(a.deepStrictEqual, {a: 4}, {a: 4}));
assert.doesNotThrow(makeBlock(a.deepStrictEqual,
                              {a: 4, b: '2'},
                              {a: 4, b: '2'}));
assert.throws(makeBlock(a.deepStrictEqual, [4], ['4']),
              common.expectsError({
                code: 'ERR_ASSERTION',
                type: a.AssertionError,
                message: /^\[ 4 ] deepStrictEqual \[ '4' ]$/
              }));
assert.throws(makeBlock(a.deepStrictEqual, {a: 4}, {a: 4, b: true}),
              common.expectsError({
                code: 'ERR_ASSERTION',
                type: a.AssertionError,
                message: /^{ a: 4 } deepStrictEqual { a: 4, b: true }$/
              }));
assert.throws(makeBlock(a.deepStrictEqual, ['a'], {0: 'a'}),
              common.expectsError({
                code: 'ERR_ASSERTION',
                type: a.AssertionError,
                message: /^\[ 'a' ] deepStrictEqual { '0': 'a' }$/
              }));
//(although not necessarily the same order),
assert.doesNotThrow(makeBlock(a.deepStrictEqual,
                              {a: 4, b: '1'},
                              {b: '1', a: 4}));

assert.throws(makeBlock(a.deepStrictEqual,
                        [0, 1, 2, 'a', 'b'],
                        [0, 1, 2, 'b', 'a']),
              a.AssertionError);

assert.doesNotThrow(makeBlock(a.deepStrictEqual, a1, a2));

// Prototype check
function Constructor1(first, last) {
  this.first = first;
  this.last = last;
}

function Constructor2(first, last) {
  this.first = first;
  this.last = last;
}

const obj1 = new Constructor1('Ryan', 'Dahl');
let obj2 = new Constructor2('Ryan', 'Dahl');

assert.throws(makeBlock(a.deepStrictEqual, obj1, obj2), a.AssertionError);

Constructor2.prototype = Constructor1.prototype;
obj2 = new Constructor2('Ryan', 'Dahl');

assert.doesNotThrow(makeBlock(a.deepStrictEqual, obj1, obj2));

// primitives
assert.throws(makeBlock(assert.deepStrictEqual, 4, '4'),
              a.AssertionError);
assert.throws(makeBlock(assert.deepStrictEqual, true, 1),
              a.AssertionError);
assert.throws(makeBlock(assert.deepStrictEqual, Symbol(), Symbol()),
              a.AssertionError);

const s = Symbol();
assert.doesNotThrow(makeBlock(assert.deepStrictEqual, s, s));


// primitives and object
assert.throws(makeBlock(a.deepStrictEqual, null, {}), a.AssertionError);
assert.throws(makeBlock(a.deepStrictEqual, undefined, {}), a.AssertionError);
assert.throws(makeBlock(a.deepStrictEqual, 'a', ['a']), a.AssertionError);
assert.throws(makeBlock(a.deepStrictEqual, 'a', {0: 'a'}), a.AssertionError);
assert.throws(makeBlock(a.deepStrictEqual, 1, {}), a.AssertionError);
assert.throws(makeBlock(a.deepStrictEqual, true, {}), a.AssertionError);
assert.throws(makeBlock(assert.deepStrictEqual, Symbol(), {}),
              a.AssertionError);


// primitive wrappers and object
assert.throws(makeBlock(a.deepStrictEqual, new String('a'), ['a']),
              a.AssertionError);
assert.throws(makeBlock(a.deepStrictEqual, new String('a'), {0: 'a'}),
              a.AssertionError);
assert.throws(makeBlock(a.deepStrictEqual, new Number(1), {}),
              a.AssertionError);
assert.throws(makeBlock(a.deepStrictEqual, new Boolean(true), {}),
              a.AssertionError);


// Testing the throwing
function thrower(errorConstructor) {
  throw new errorConstructor({});
}

// the basic calls work
assert.throws(makeBlock(thrower, a.AssertionError),
              a.AssertionError, 'message');
assert.throws(makeBlock(thrower, a.AssertionError), a.AssertionError);
// eslint-disable-next-line assert-throws-arguments
assert.throws(makeBlock(thrower, a.AssertionError));

// if not passing an error, catch all.
// eslint-disable-next-line assert-throws-arguments
assert.throws(makeBlock(thrower, TypeError));

// when passing a type, only catch errors of the appropriate type
{
  let threw = false;
  try {
    a.throws(makeBlock(thrower, TypeError), a.AssertionError);
  } catch (e) {
    threw = true;
    assert.ok(e instanceof TypeError, 'type');
  }
  assert.strictEqual(true, threw,
                     'a.throws with an explicit error is eating extra errors');
}

// doesNotThrow should pass through all errors
{
  let threw = false;
  try {
    a.doesNotThrow(makeBlock(thrower, TypeError), a.AssertionError);
  } catch (e) {
    threw = true;
    assert.ok(e instanceof TypeError);
  }
  assert.strictEqual(true, threw, 'a.doesNotThrow with an explicit error is ' +
                     'eating extra errors');
}

// key difference is that throwing our correct error makes an assertion error
{
  let threw = false;
  try {
    a.doesNotThrow(makeBlock(thrower, TypeError), TypeError);
  } catch (e) {
    threw = true;
    assert.ok(e instanceof a.AssertionError);
  }
  assert.strictEqual(true, threw,
                     'a.doesNotThrow is not catching type matching errors');
}

assert.throws(function() { assert.ifError(new Error('test error')); },
              /^Error: test error$/);
assert.doesNotThrow(function() { assert.ifError(null); });
assert.doesNotThrow(function() { assert.ifError(); });

assert.throws(() => {
  assert.doesNotThrow(makeBlock(thrower, Error), 'user message');
}, /Got unwanted exception: user message/,
              'a.doesNotThrow ignores user message');

// make sure that validating using constructor really works
{
  let threw = false;
  try {
    assert.throws(
        function() {
          throw ({}); // eslint-disable-line no-throw-literal
        },
        Array
    );
  } catch (e) {
    threw = true;
  }
  assert.ok(threw, 'wrong constructor validation');
}

// use a RegExp to validate error message
a.throws(makeBlock(thrower, TypeError), /\[object Object\]/);

// use a fn to validate error object
a.throws(makeBlock(thrower, TypeError), function(err) {
  if ((err instanceof TypeError) && /\[object Object\]/.test(err)) {
    return true;
  }
});

// https://github.com/nodejs/node/issues/3188
{
  let threw = false;

  let AnotherErrorType;
  try {
    const ES6Error = class extends Error {};

    AnotherErrorType = class extends Error {};

    const functionThatThrows = () => {
      throw new AnotherErrorType('foo');
    };

    assert.throws(functionThatThrows, ES6Error);
  } catch (e) {
    threw = true;
    assert(e instanceof AnotherErrorType,
           `expected AnotherErrorType, received ${e}`);
  }

  assert.ok(threw);
}

// https://github.com/nodejs/node/issues/6416
// Make sure circular refs don't throw.
{
  const b = {};
  b.b = b;

  const c = {};
  c.b = c;

  a.doesNotThrow(makeBlock(a.deepEqual, b, c));
  a.doesNotThrow(makeBlock(a.deepStrictEqual, b, c));

  const d = {};
  d.a = 1;
  d.b = d;

  const e = {};
  e.a = 1;
  e.b = e.a;

  a.throws(makeBlock(a.deepEqual, d, e), /AssertionError/);
  a.throws(makeBlock(a.deepStrictEqual, d, e), /AssertionError/);

  // https://github.com/nodejs/node/issues/13314
  const f = {};
  f.ref = f;

  const g = {};
  g.ref = g;

  const h = {ref: g};

  a.throws(makeBlock(a.deepEqual, f, h), /AssertionError/);
  a.throws(makeBlock(a.deepStrictEqual, f, h), /AssertionError/);
}
// GH-7178. Ensure reflexivity of deepEqual with `arguments` objects.
const args = (function() { return arguments; })();
a.throws(makeBlock(a.deepEqual, [], args));
a.throws(makeBlock(a.deepEqual, args, []));

// more checking that arguments objects are handled correctly
{
  // eslint-disable-next-line func-style
  const returnArguments = function() { return arguments; };

  const someArgs = returnArguments('a');
  const sameArgs = returnArguments('a');
  const diffArgs = returnArguments('b');

  a.throws(makeBlock(a.deepEqual, someArgs, ['a']));
  a.throws(makeBlock(a.deepEqual, ['a'], someArgs));
  a.throws(makeBlock(a.deepEqual, someArgs, {'0': 'a'}));
  a.throws(makeBlock(a.deepEqual, someArgs, diffArgs));
  a.doesNotThrow(makeBlock(a.deepEqual, someArgs, sameArgs));
}

// check messages from assert.throws()
{
  const noop = () => {};
  assert.throws(
    () => { a.throws((noop)); },
    common.expectsError({
      code: 'ERR_ASSERTION',
      message: /^Missing expected exception\.$/
    }));

  assert.throws(
    () => { a.throws(noop, TypeError); },
    common.expectsError({
      code: 'ERR_ASSERTION',
      message: /^Missing expected exception \(TypeError\)\.$/
    }));

  assert.throws(
    () => { a.throws(noop, 'fhqwhgads'); },
    common.expectsError({
      code: 'ERR_ASSERTION',
      message: /^Missing expected exception: fhqwhgads$/
    }));

  assert.throws(
    () => { a.throws(noop, TypeError, 'fhqwhgads'); },
    common.expectsError({
      code: 'ERR_ASSERTION',
      message: /^Missing expected exception \(TypeError\): fhqwhgads$/
    }));
}

const circular = {y: 1};
circular.x = circular;

function testAssertionMessage(actual, expected) {
  try {
    assert.strictEqual(actual, '');
  } catch (e) {
    assert.strictEqual(e.message,
                       [expected, '===', '\'\''].join(' '));
    assert.ok(e.generatedMessage, 'Message not marked as generated');
  }
}

testAssertionMessage(undefined, 'undefined');
testAssertionMessage(null, 'null');
testAssertionMessage(true, 'true');
testAssertionMessage(false, 'false');
testAssertionMessage(0, '0');
testAssertionMessage(100, '100');
testAssertionMessage(NaN, 'NaN');
testAssertionMessage(Infinity, 'Infinity');
testAssertionMessage(-Infinity, '-Infinity');
testAssertionMessage('', '""');
testAssertionMessage('foo', '\'foo\'');
testAssertionMessage([], '[]');
testAssertionMessage([1, 2, 3], '[ 1, 2, 3 ]');
testAssertionMessage(/a/, '/a/');
testAssertionMessage(/abc/gim, '/abc/gim');
testAssertionMessage(function f() {}, '[Function: f]');
testAssertionMessage(function() {}, '[Function]');
testAssertionMessage({}, '{}');
testAssertionMessage(circular, '{ y: 1, x: [Circular] }');
testAssertionMessage({a: undefined, b: null}, '{ a: undefined, b: null }');
testAssertionMessage({a: NaN, b: Infinity, c: -Infinity},
                     '{ a: NaN, b: Infinity, c: -Infinity }');

// #2893
{
  let threw = false;
  try {
    // eslint-disable-next-line assert-throws-arguments
    assert.throws(function() {
      assert.ifError(null);
    });
  } catch (e) {
    threw = true;
    assert.strictEqual(e.message, 'Missing expected exception.');
  }
  assert.ok(threw);
}

// #5292
try {
  assert.strictEqual(1, 2);
} catch (e) {
  assert.strictEqual(e.message.split('\n')[0], '1 === 2');
  assert.ok(e.generatedMessage, 'Message not marked as generated');
}

try {
  assert.strictEqual(1, 2, 'oh no');
} catch (e) {
  assert.strictEqual(e.message.split('\n')[0], 'oh no');
  assert.strictEqual(e.generatedMessage, false,
                     'Message incorrectly marked as generated');
}

{
  // Verify that throws() and doesNotThrow() throw on non-function block
  function typeName(value) {
    return value === null ? 'null' : typeof value;
  }

  const testBlockTypeError = (method, block) => {
    let threw = true;

    try {
      method(block);
      threw = false;
    } catch (e) {
      common.expectsError({
        code: 'ERR_INVALID_ARG_TYPE',
        type: TypeError,
        message: 'The "block" argument must be of type function. Received ' +
                 'type ' + typeName(block)
      })(e);
    }

    assert.ok(threw);
  };

  testBlockTypeError(assert.throws, 'string');
  testBlockTypeError(assert.doesNotThrow, 'string');
  testBlockTypeError(assert.throws, 1);
  testBlockTypeError(assert.doesNotThrow, 1);
  testBlockTypeError(assert.throws, true);
  testBlockTypeError(assert.doesNotThrow, true);
  testBlockTypeError(assert.throws, false);
  testBlockTypeError(assert.doesNotThrow, false);
  testBlockTypeError(assert.throws, []);
  testBlockTypeError(assert.doesNotThrow, []);
  testBlockTypeError(assert.throws, {});
  testBlockTypeError(assert.doesNotThrow, {});
  testBlockTypeError(assert.throws, /foo/);
  testBlockTypeError(assert.doesNotThrow, /foo/);
  testBlockTypeError(assert.throws, null);
  testBlockTypeError(assert.doesNotThrow, null);
  testBlockTypeError(assert.throws, undefined);
  testBlockTypeError(assert.doesNotThrow, undefined);
}

// https://github.com/nodejs/node/issues/3275
// eslint-disable-next-line no-throw-literal
assert.throws(() => { throw 'error'; }, (err) => err === 'error');
assert.throws(() => { throw new Error(); }, (err) => err instanceof Error);

// Long values should be truncated for display.
assert.throws(() => {
  assert.strictEqual('A'.repeat(1000), '');
}, common.expectsError({
  code: 'ERR_ASSERTION',
  message: new RegExp(`^'${'A'.repeat(127)} === ''$`)}));

{
  // bad args to AssertionError constructor should throw TypeError
  const args = [1, true, false, '', null, Infinity, Symbol('test'), undefined];
  const re = /^The "options" argument must be of type object$/;
  args.forEach((input) => {
    assert.throws(
      () => new assert.AssertionError(input),
      common.expectsError({
        code: 'ERR_INVALID_ARG_TYPE',
        type: TypeError,
        message: re
      }));
  });
}