84 lines
2.6 KiB
JavaScript
84 lines
2.6 KiB
JavaScript
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'use strict';
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/* globals window */
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var test = require('tape');
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var isGeneratorFunction = require('../index');
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var generatorFuncs = require('make-generator-function')();
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var hasToStringTag = require('has-tostringtag/shams')();
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var forEach = function (arr, func) {
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var i;
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for (i = 0; i < arr.length; ++i) {
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func(arr[i], i, arr);
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}
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};
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test('returns false for non-functions', function (t) {
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var nonFuncs = [
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true,
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false,
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null,
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undefined,
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{},
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[],
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/a/g,
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'string',
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42,
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new Date()
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];
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t.plan(nonFuncs.length);
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forEach(nonFuncs, function (nonFunc) {
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t.notOk(isGeneratorFunction(nonFunc), nonFunc + ' is not a function');
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});
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t.end();
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});
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test('returns false for non-generator functions', function (t) {
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var func = function () {};
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t.notOk(isGeneratorFunction(func), 'anonymous function is not an generator function');
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var namedFunc = function foo() {};
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t.notOk(isGeneratorFunction(namedFunc), 'named function is not an generator function');
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if (typeof window === 'undefined') {
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t.skip('window.alert is not an generator function');
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} else {
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t.notOk(isGeneratorFunction(window.alert), 'window.alert is not an generator function');
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}
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t.end();
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});
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var fakeToString = function () { return 'function* () { return "TOTALLY REAL I SWEAR!"; }'; };
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test('returns false for non-generator function with faked toString', function (t) {
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var func = function () {};
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func.toString = fakeToString;
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t.notEqual(String(func), Function.prototype.toString.apply(func), 'faked toString is not real toString');
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t.notOk(isGeneratorFunction(func), 'anonymous function with faked toString is not a generator function');
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t.end();
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});
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test('returns false for non-generator function with faked @@toStringTag', { skip: !hasToStringTag || generatorFuncs.length === 0 }, function (t) {
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var generatorFunc = generatorFuncs[0];
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var fakeGenFunction = {
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toString: function () { return String(generatorFunc); },
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valueOf: function () { return generatorFunc; }
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};
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fakeGenFunction[Symbol.toStringTag] = 'GeneratorFunction';
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t.notOk(isGeneratorFunction(fakeGenFunction), 'fake GeneratorFunction with @@toStringTag "GeneratorFunction" is not a generator function');
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t.end();
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});
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test('returns true for generator functions', function (t) {
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if (generatorFuncs.length > 0) {
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forEach(generatorFuncs, function (generatorFunc) {
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t.ok(isGeneratorFunction(generatorFunc), generatorFunc + ' is generator function');
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});
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} else {
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t.skip('generator function is generator function - this environment does not support ES6 generator functions. Please run `node --harmony`, or use a supporting browser.');
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}
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t.end();
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});
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