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Viewing file:     index.js (2.57 KB)      -rw-r--r--

'use strict';

/* globals window */

var test = require('tape');
var isGeneratorFunction = require('../index');
var generatorFuncs = require('make-generator-function')();
var hasToStringTag = require('has-tostringtag/shams')();

var forEach = function (arr, func) {
	var i;
	for (i = 0; i < arr.length; ++i) {
		func(arr[i], i, arr);
	}
};

test('returns false for non-functions', function (t) {
	var nonFuncs = [
		true,
		false,
		null,
		undefined,
		{},
		[],
		/a/g,
		'string',
		42,
		new Date()
	];
	t.plan(nonFuncs.length);
	forEach(nonFuncs, function (nonFunc) {
		t.notOk(isGeneratorFunction(nonFunc), nonFunc + ' is not a function');
	});
	t.end();
});

test('returns false for non-generator functions', function (t) {
	var func = function () {};
	t.notOk(isGeneratorFunction(func), 'anonymous function is not an generator function');

	var namedFunc = function foo() {};
	t.notOk(isGeneratorFunction(namedFunc), 'named function is not an generator function');

	if (typeof window === 'undefined') {
		t.skip('window.alert is not an generator function');
	} else {
		t.notOk(isGeneratorFunction(window.alert), 'window.alert is not an generator function');
	}
	t.end();
});

var fakeToString = function () { return 'function* () { return "TOTALLY REAL I SWEAR!"; }'; };

test('returns false for non-generator function with faked toString', function (t) {
	var func = function () {};
	func.toString = fakeToString;

	t.notEqual(String(func), Function.prototype.toString.apply(func), 'faked toString is not real toString');
	t.notOk(isGeneratorFunction(func), 'anonymous function with faked toString is not a generator function');
	t.end();
});

test('returns false for non-generator function with faked @@toStringTag', { skip: !hasToStringTag || generatorFuncs.length === 0 }, function (t) {
	var generatorFunc = generatorFuncs[0];
	var fakeGenFunction = {
		toString: function () { return String(generatorFunc); },
		valueOf: function () { return generatorFunc; }
	};
	fakeGenFunction[Symbol.toStringTag] = 'GeneratorFunction';
	t.notOk(isGeneratorFunction(fakeGenFunction), 'fake GeneratorFunction with @@toStringTag "GeneratorFunction" is not a generator function');
	t.end();
});

test('returns true for generator functions', function (t) {
	if (generatorFuncs.length > 0) {
		forEach(generatorFuncs, function (generatorFunc) {
			t.ok(isGeneratorFunction(generatorFunc), generatorFunc + ' is generator function');
		});
	} else {
		t.skip('generator function is generator function - this environment does not support ES6 generator functions. Please run `node --harmony`, or use a supporting browser.');
	}
	t.end();
});