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'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();
});