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Viewing file:     throws.js (8.4 KB)      -rw-r--r--

'use strict';

var tape = require('../');
var tap = require('tap');
var concat = require('concat-stream');
var inspect = require('object-inspect');
var assign = require('object.assign');

var stripFullStack = require('./common').stripFullStack;

var getter = function () { return 'message'; };
var messageGetterError = Object.defineProperty(
	{ custom: 'error' },
	'message',
	{
		configurable: true,
		enumerable: true,
		get: getter
	}
);
var thrower = function () { throw messageGetterError; };

tap.test('failures', function (tt) {
	tt.plan(1);

	var test = tape.createHarness();
	test.createStream().pipe(concat(function (body) {
		tt.same(stripFullStack(body.toString('utf8')), [
			'TAP version 13',
			'# non functions',
			'ok 1 should throw',
			'ok 2 should throw',
			'ok 3 should throw',
			'ok 4 should throw',
			'ok 5 should throw',
			'ok 6 should throw',
			'ok 7 should throw',
			'ok 8 should throw',
			'# function',
			'not ok 9 should throw',
			'  ---',
			'    operator: throws',
			'    expected: undefined',
			'    actual:   undefined',
			'    at: Test.<anonymous> ($TEST/throws.js:$LINE:$COL)',
			'    stack: |-',
			'      Error: should throw',
			'          [... stack stripped ...]',
			'          at Test.<anonymous> ($TEST/throws.js:$LINE:$COL)',
			'          [... stack stripped ...]',
			'  ...',
			'# custom error messages',
			'ok 10 "message" is enumerable',
			"ok 11 { custom: 'error', message: 'message' }",
			'ok 12 getter is still the same',
			'# throws null',
			'ok 13 throws null',
			'# wrong type of error',
			'not ok 14 throws actual',
			'  ---',
			'    operator: throws',
			'    expected: |-',
			'      [Function: TypeError]',
			'    actual: |-',
			"      { [RangeError: actual!] message: 'actual!' }",
			'    at: Test.<anonymous> ($TEST/throws.js:$LINE:$COL)',
			'    stack: |-',
			'      RangeError: actual!',
			'          at Test.<anonymous> ($TEST/throws.js:$LINE:$COL)',
			'          [... stack stripped ...]',
			'  ...',
			'# object',
			'ok 15 object properties are validated',
			'# object with regexes',
			'ok 16 object with regex values is validated',
			'# similar error object',
			'ok 17 throwing a similar error',
			'# validate with regex',
			'ok 18 regex against toString of error',
			'# custom error validation',
			'ok 19 error is SyntaxError',
			'ok 20 error matches /value/',
			'ok 21 unexpected error',
			'# throwing primitives',
			'ok 22 primitive: null',
			'ok 23 primitive: undefined',
			'ok 24 primitive: 0',
			'ok 25 primitive: NaN',
			'ok 26 primitive: 42',
			'ok 27 primitive: Infinity',
			'ok 28 primitive: \'\'',
			'ok 29 primitive: \'foo\'',
			'ok 30 primitive: true',
			'ok 31 primitive: false',
			'# ambiguous arguments',
			'ok 32 Second',
			'ok 33 Second',
			'ok 34 Second',
			'ok 35 should throw',
			'not ok 36 should throw',
			'  ---',
			'    operator: throws',
			'    expected: |-',
			'      \'/Second$/\'',
			'    actual: |-',
			'      { [Error: First] message: \'First\' }',
			'    at: Test.<anonymous> ($TEST/throws.js:$LINE:$COL)',
			'    stack: |-',
			'      Error: First',
			'          at throwingFirst ($TEST/throws.js:$LINE:$COL)',
			'          [... stack stripped ...]',
			'          at Test.<anonymous> ($TEST/throws.js:$LINE:$COL)',
			'          [... stack stripped ...]',
			'  ...',
			'',
			'1..36',
			'# tests 36',
			'# pass  33',
			'# fail  3',
			''
		]);
	}));

	test('non functions', function (t) {
		t.plan(8);
		t.throws();
		t.throws(null);
		t.throws(true);
		t.throws(false);
		t.throws('abc');
		t.throws(/a/g);
		t.throws([]);
		t.throws({});
	});

	test('function', function (t) {
		t.plan(1);
		t.throws(function () {});
	});

	test('custom error messages', function (t) {
		t.plan(3);
		t.equal(Object.prototype.propertyIsEnumerable.call(messageGetterError, 'message'), true, '"message" is enumerable');
		t.throws(thrower, "{ custom: 'error', message: 'message' }");
		t.equal(Object.getOwnPropertyDescriptor(messageGetterError, 'message').get, getter, 'getter is still the same');
	});

	test('throws null', function (t) {
		t.plan(1);
		t.throws(function () { throw null; }, 'throws null');
		t.end();
	});

	test('wrong type of error', function (t) {
		t.plan(1);
		var actual = new RangeError('actual!');
		t.throws(function () { throw actual; }, TypeError, 'throws actual');
		t.end();
	});

	// taken from https://nodejs.org/api/assert.html#assert_assert_throws_fn_error_message
	var err = new TypeError('Wrong value');
	err.code = 404;
	err.foo = 'bar';
	err.info = {
		nested: true,
		baz: 'text'
	};
	err.reg = /abc/i;

	test('object', function (t) {
		t.plan(1);

		t.throws(
			function () { throw err; },
			{
				name: 'TypeError',
				message: 'Wrong value',
				info: {
					nested: true,
					baz: 'text'
				}
				// Only properties on the validation object will be tested for.
				// Using nested objects requires all properties to be present. Otherwise
				// the validation is going to fail.
			},
			'object properties are validated'
		);

		t.end();
	});

	test('object with regexes', function (t) {
		t.plan(1);
		t.throws(
			function () { throw err; },
			{
				// The `name` and `message` properties are strings and using regular
				// expressions on those will match against the string. If they fail, an
				// error is thrown.
				name: /^TypeError$/,
				message: /Wrong/,
				foo: 'bar',
				info: {
					nested: true,
					// It is not possible to use regular expressions for nested properties!
					baz: 'text'
				},
				// The `reg` property contains a regular expression and only if the
				// validation object contains an identical regular expression, it is going
				// to pass.
				reg: /abc/i
			},
			'object with regex values is validated'
		);
		t.end();
	});

	test('similar error object', function (t) {
		t.plan(1);
		t.throws(
			function () {
				var otherErr = new TypeError('Not found');
				// Copy all enumerable properties from `err` to `otherErr`.
				assign(otherErr, err);
				throw otherErr;
			},
			// The error's `message` and `name` properties will also be checked when using
			// an error as validation object.
			err,
			'throwing a similar error'
		);
		t.end();
	});

	test('validate with regex', function (t) {
		t.plan(1);
		t.throws(
			function () { throw new Error('Wrong value'); },
			/^Error: Wrong value$/,
			'regex against toString of error'
		);
		t.end();
	});

	test('custom error validation', function (t) {
		t.plan(3);
		t.throws(
			function () { throw new SyntaxError('Wrong value'); },
			function (error) {
				t.ok(error instanceof SyntaxError, 'error is SyntaxError');
				t.ok((/value/).test(error), 'error matches /value/');
				// Avoid returning anything from validation functions besides `true`.
				// Otherwise, it's not clear what part of the validation failed. Instead,
				// throw an error about the specific validation that failed (as done in this
				// example) and add as much helpful debugging information to that error as
				// possible.
				return true;
			},
			'unexpected error'
		);
		t.end();
	});

	test('throwing primitives', function (t) {
		[null, undefined, 0, NaN, 42, Infinity, '', 'foo', true, false].forEach(function (primitive) {
			t.throws(function () { throw primitive; }, 'primitive: ' + inspect(primitive));
		});

		t.end();
	});

	test('ambiguous arguments', function (t) {
		function throwingFirst() {
			throw new Error('First');
		}

		function throwingSecond() {
			throw new Error('Second');
		}

		function notThrowing() {}

		// The second argument is a string and the input function threw an Error.
		// The first case will not throw as it does not match for the error message
		// thrown by the input function!
		t.throws(throwingFirst, 'Second');
		// In the next example the message has no benefit over the message from the
		// error and since it is not clear if the user intended to actually match
		// against the error message, Node.js throws an `ERR_AMBIGUOUS_ARGUMENT` error.
		t.throws(throwingSecond, 'Second');
		// TypeError [ERR_AMBIGUOUS_ARGUMENT]

		// The string is only used (as message) in case the function does not throw:
		t.doesNotThrow(notThrowing, 'Second');
		// AssertionError [ERR_ASSERTION]: Missing expected exception: Second

		// If it was intended to match for the error message do this instead:
		// It does not fail because the error messages match.
		t.throws(throwingSecond, /Second$/);

		// If the error message does not match, an AssertionError is thrown.
		t.throws(throwingFirst, /Second$/);
		// AssertionError [ERR_ASSERTION]
		t.end();
	});
});